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Diffstat (limited to 'docs')
19 files changed, 25 insertions, 1466 deletions
diff --git a/docs/development/design/OPNFV_HA_Guest_APIs-Base-Messaging-Layer.rst b/docs/development/design/OPNFV_HA_Guest_APIs-Base-Messaging-Layer.rst new file mode 100644 index 0000000..ef82456 --- /dev/null +++ b/docs/development/design/OPNFV_HA_Guest_APIs-Base-Messaging-Layer.rst @@ -0,0 +1,6 @@ +.. This work is licensed under a Creative Commons Attribution 4.0 International License. +.. http://creativecommons.org/licenses/by/4.0 +.. (c) <optionally add copywriters name> +========================================================= +OPNFV HA Guest APIs -- Base Host-to-Guest Messaging Layer +=========================================================
\ No newline at end of file diff --git a/docs/development/design/OPNFV_HA_Guest_APIs-Server-Group-Messaging_HLD.rst b/docs/development/design/OPNFV_HA_Guest_APIs-Server-Group-Messaging_HLD.rst new file mode 100644 index 0000000..59ca24e --- /dev/null +++ b/docs/development/design/OPNFV_HA_Guest_APIs-Server-Group-Messaging_HLD.rst @@ -0,0 +1,6 @@ +.. This work is licensed under a Creative Commons Attribution 4.0 International License. +.. http://creativecommons.org/licenses/by/4.0 +.. (c) <optionally add copywriters name> +============================================== +OPNFV HA Guest APIs -- Server Group Messaging +==============================================
\ No newline at end of file diff --git a/docs/scenarios/index.rst b/docs/development/design/index.rst index dec46c7..e2d3241 100644 --- a/docs/scenarios/index.rst +++ b/docs/development/design/index.rst @@ -3,11 +3,12 @@ .. (c) <optionally add copywriters name> ********************************* -Gap Analysis of High Availability +OPNFV HA Guest APIs ********************************* .. toctree:: :numbered: - :maxdepth: 4 + :maxdepth: 2 - GAP_Analysis_Colorado.rst + OPNFV_HA_Guest_APIs-Base-Messaging-Layer.rst + OPNFV_HA_Guest_APIs-server-Group-messaging_HLD.rst diff --git a/docs/development/overview/OPNFV_HA_Guest_APIs-Overview_HLD.rst b/docs/development/overview/OPNFV_HA_Guest_APIs-Overview_HLD.rst new file mode 100644 index 0000000..92ff964 --- /dev/null +++ b/docs/development/overview/OPNFV_HA_Guest_APIs-Overview_HLD.rst @@ -0,0 +1,6 @@ +.. This work is licensed under a Creative Commons Attribution 4.0 International License. +.. http://creativecommons.org/licenses/by/4.0 +.. (c) <optionally add copywriters name> +==================================== +OPNFV HA Guest APIs -- Overview +====================================
\ No newline at end of file diff --git a/docs/userguide/index.rst b/docs/development/overview/index.rst index 2938b15..71bdbf4 100644 --- a/docs/userguide/index.rst +++ b/docs/development/overview/index.rst @@ -3,11 +3,11 @@ .. (c) <optionally add copywriters name> ********************************* -HA Deployment Framework Guideline +OPNFV HA Guest APIs -- Overview ********************************* .. toctree:: :numbered: - :maxdepth: 4 + :maxdepth: 2 - Deployment_Guideline.rst + OPNFV_HA_Guest_APIs-Overview_HLD.rst diff --git a/docs/scenarios/GAP_Analysis_Colorado.rst b/docs/scenarios/GAP_Analysis_Colorado.rst deleted file mode 100644 index 4fefc09..0000000 --- a/docs/scenarios/GAP_Analysis_Colorado.rst +++ /dev/null @@ -1,278 +0,0 @@ -Introduction: -^^^^^^^^^^^^^ - -During the Colorado release the OPNFV availability team has reviewed a number of gaps -in support for high availability in various areas of OPNFV. The focus and goal was -to find gaps and work with the various open source communities( OpenStack as an -example ) to develop solutions and blueprints. This would enhance the overall -system availability and reliability of OPNFV going forward. We also worked with -the OPNFV Doctor team to ensure our activities were coordinated. In the next -releases of OPNFV the availability team will update the status of open gaps and -continue to look for additional gaps. - -Summary of findings: -^^^^^^^^^^^^^^^^^^^^ - -1. Publish health status of compute node - this gap is now closed through and -OpenStack blueprint in Mitaka - -2. Health status of compute node - some good work underway in OpenStack and with -the Doctor team, we will continue to monitor this work. - -3. Store consoleauth tokens to the database - this gap can be address through -changing OpenStack configurations - -4. Active/Active HA of cinder-volume - active work underway in Newton, we will -monitor closely - -5. Cinder volume multi-attachment - this work has been completed in OpenStack - -this gap is now closed - -6. Add HA tests into Fuel - the Availability team has been working with the -Yardstick team to create additional test case for the Colorado release. Some of -these test cases would be good additions to installers like Fuel. - -Detailed explanation of the gaps and findings: -^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - -GAP 1: Publish the health status of compute node -================================================ - -* Type: 'reliability' -* Description: - - Current compute node status is only kept within nova. However, NFVO and VNFM - may also need these information. For example, NFVO may trigger scale up/down - based on the status. VNFM may trigger evacuation. In the meantime, in the - high availability scenarios, VNFM may need the host status info from the VIM - so that it can figure out what the failure exactly located. Therefore, these - info need to be published outside to the NFVO and VNFM. - - + Desired state - - - Be able to have the health status of compute nodes published. - - + Current behaviour - - - Nova queries the ServiceGroup API to get the node liveness information. - - + Gap - -- Currently Service Group is keeping the health status of compute nodes internal -- within nova, could have had those status published to NFV MANO plane. - -Findings: - -BP from the OPNFV Doctor team has covered this GAP. Add notification for service -status change. - -Status: Merged (Mitaka release) - - + Owner: Balazs - - + BP: https://blueprints.launchpad.net/nova/+spec/service-status-notification - - + Spec: https://review.openstack.org/182350 - - + Code: https://review.openstack.org/#/c/245678/ - - + Merged Jan 2016 - Mitaka - -GAP 2: Health status of compute node -==================================== - -* Type: 'reliability' -* Description: - - + Desired state: - - - Provide the health status of compute nodes. - - + Current Behaviour - - - Currently , while performing some actions like evacuation, Nova is - checking for the compute service. If the service is down,it is assumed - the host is down. This is not exactly true, since there is a possibility - to only have compute service down, while all VMs that are running on the - host, are actually up. There is no way to distinguish between two really - different things: host status and nova-compute status, which is deployed - on the host. - - Also, provided host information by API and commands, are service centric, - i.e."nova host-list" is just another wrapper for "nova service-list" with - different format (in fact "service-list" is a super set to "host-list"). - - - + Gap - - - Not all the health information of compute nodes can be provided. Seems like - nova is treating *host* term equally to *compute-host*, which might be misleading. - Such situations can be error prone for the case where there is a need to perform - host evacuation. - - -Related BP: - -Pacemaker and Corosync can provide info about the host. Therefore, there is -requirement to have nova support the pacemaker service group driver. There could -be another option by adding tooz servicegroup driver to nova, and then have to -support corosync driver. - - + https://blueprints.launchpad.net/nova/+spec/tooz-for-service-groups - -Doctor team is not working on this blueprint - -NOTE: This bp is active. A suggestion is to adopt this bp and add a corosync -driver to tooz. Could be a solution. - -We should keep following this bp, when it finished, see if we could add a -corosync driver for tooz to close this gap. - -Here are the currently supported driver in tooz. -https://github.com/openstack/tooz/blob/master/doc/source/drivers.rst Meanwhile, -we should also look into the doctor project and see if this could be solved. - -This work is still underway, but, doesn't directly map to the gap that it is -identified above. Doctor team looking to get faster updates on node status and -failure status - these are other blueprints. These are good problems to solve. - -GAP 3: Store consoleauth tokens to the database -=============================================== - -* Type: 'performance' -* Description: - -+ Desired state - - - Change the consoleauth service to store the tokens in the databaseand, optionally, - cache them in memory as it does now for fast access. - -+ Current State - - - Currently the consoleauth service is storing the tokens and theconnection data - only in memory. This behavior makes impossible to have multipleinstances of this - service in a cluster as there is no way for one of theisntances to know the tokens - issued by the other. - - - The consoleauth service can use a memcached server to store those tokens,but again, - if we want to share them among different instances of it we would berelying in one - memcached server which makes this solution unsuitable for a highly available - architecture where we should be able to replicate all ofthe services in our cluster. - -+ Gap - - - The consoleauth service is storing the tokens and the connection data only in memory. - This behavior makes impossible to have multiple instances of this service in a cluster - as there is no way for one of the instances to know the tokens issued by the other. - -* Related BP - - + https://blueprints.launchpad.net/nova/+spec/consoleauth-tokens-in-db - - The advise in the blueprint is to use memcached as a backend. Looking to the - documentation memcached is not able to replicate data, so this is not a - complete solution. But maybe redis (http://redis.io/) is a suitable backend - to store the tokens that survive node failures. This blueprint is not - directly needed for this gap. - -Findings: - -This bp has been rejected since the community feedback is that A/A can be -supported by memcacheD. The usecase for this bp is not quite clear, since when -the consoleauth service is done and the token is lost, the other service can -retrieve the token again after it recovers. Can be accomplished through a -different configuration set up for OpenStack. Therefore not a gap. -Recommendation of the team is to verify the redis approach. - - -GAP 4: Active/Active HA of cinder-volume -======================================== - -* Type: 'reliability/scalability' - -* Description: - - + Desired State: - - - Cinder-volume can run in an active/active configuration. - - + Current State: - - - Only one cinder-volume instance can be active. Failover to be handledby - external mechanism such as pacemaker/corosync. - - + Gap - - - Cinder-volume doesn't supprt active/active configuration. - -* Related BP - - + https://blueprints.launchpad.net/cinder/+spec/cinder-volume-active-active-support - -* Findings: - - + This blueprint underway for Newton - as of July 6, 2016 great progress has - been made, we will continue to monitor the progress. - -GAP 5: Cinder volume multi-attachment -===================================== - -* Type: 'reliability' -* Description: - - + Desired State - - - Cinder volumes can be attached to multiple VMs at the same time. So that - active/standby stateful VNFs can share the same Cinder volume. - - + Current State - - - Cinder volumes can only be attached to one VM at a time. - - + Gap - - - Nova and cinder do not allow for multiple simultaneous attachments. - -* Related BP - - + https://blueprints.launchpad.net/openstack/?searchtext=multi-attach-volume - -* Findings - - + Multi-attach volume is still WIP in OpenStack. There is coordination work required with Nova. - + At risk for Newton - + Recommend adding a Yardstick test case. - -General comment for the next release. Remote volume replication is another -important project for storage HA. -The HA team will monitor this multi-blueprint activity that will span multiple -OpenStack releases. The blueprints aren't approved yet and there dependencies -on generic-volume-group. - - - -GAP 6: HA tests improvements in fuel -==================================== - -* Type: 'robustness' -* Description: - - + Desired State - - Increased test coverage for HA during install - + Current State - - A few test cases are available - - * Related BP - - - https://blueprints.launchpad.net/fuel/+spec/ha-test-improvements - - Tie in with the test plans we have discussed previously. - - Look at Yardstick tests that could be proposed back to Openstack. - - Discussions planned with Yardstick team to engage with Openstack community to enhance Fuel or Tempest as appropriate. - - -Next Steps: -^^^^^^^^^^^ - -The six gaps above demonstrate that on going progress is being made in various -OPNFV and OpenStack communities. The OPNFV-HA team will work to suggest -blueprints for the next OpenStack Summit to help continue the progress of high -availability in the community. diff --git a/docs/scenarios/GAP_Analysis_Colorado.rst.bak b/docs/scenarios/GAP_Analysis_Colorado.rst.bak deleted file mode 100644 index b6b7313..0000000 --- a/docs/scenarios/GAP_Analysis_Colorado.rst.bak +++ /dev/null @@ -1,278 +0,0 @@ -Introduction: -^^^^^^^^^^^^^ - -During the Colorado release the OPNFV availability team has reviewed a number of gaps -in support for high availability in various areas of OPNFV. The focus and goal was -to find gaps and work with the various open source communities( OpenStack as an -example ) to develop solutions and blueprints. This would enhance the overall -system availability and reliability of OPNFV going forward. We also worked with -the OPNFV Doctor team to ensure our activities were coordinated. In the next -releases of OPNFV the availability team will update the status of open gaps and -continue to look for additional gaps. - -Summary of findings: -^^^^^^^^^^^^^^^^^^^^ - -1. Publish health status of compute node - this gap is now closed through and -OpenStack blueprint in Mitaka - -2. Health status of compute node - some good work underway in OpenStack and with -the Doctor team, we will continue to monitor this work. - -3. Store consoleauth tokens to the database - this gap can be address through -changing OpenStack configurations - -4. Active/Active HA of cinder-volume - active work underway in Newton, we will -monitor closely - -5. Cinder volume multi-attachment - this work has been completed in OpenStack - -this gap is now closed - -6. Add HA tests into Fuel - the Availability team has been working with the -Yardstick team to create additional test case for the Colorado release. Some of -these test cases would be good additions to installers like Fuel. - -Detailed explanation of the gaps and findings: -^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - -GAP 1: Publish the health status of compute node -================================================ - -* Type: 'reliability' -* Description: - - Current compute node status is only kept within nova. However, NFVO and VNFM - may also need these information. For example, NFVO may trigger scale up/down - based on the status. VNFM may trigger evacuation. In the meantime, in the - high availability scenarios, VNFM may need the host status info from the VIM - so that it can figure out what the failure exactly located. Therefore, these - info need to be published outside to the NFVO and VNFM. - - + Desired state - - - Be able to have the health status of compute nodes published. - - + Current behaviour - - - Nova queries the ServiceGroup API to get the node liveness information. - - + Gap - -- Currently Service Group is keeping the health status of compute nodes internal -- within nova, could have had those status published to NFV MANO plane. - -Findings: - -BP from the OPNFV Doctor team has covered this GAP. Add notification for service -status change. - -Status: Merged (Mitaka release) - - + Owner: Balazs - - + BP: https://blueprints.launchpad.net/nova/+spec/service-status-notification - - + Spec: https://review.openstack.org/182350 - - + Code: https://review.openstack.org/#/c/245678/ - - + Merged Jan 2016 - Mitaka - -GAP 2: Health status of compute node -==================================== - -* Type: 'reliability' -* Description: - - + Desired state: - - - Provide the health status of compute nodes. - - + Current Behaviour - - - Currently , while performing some actions like evacuation, Nova is - checking for the compute service. If the service is down,it is assumed - the host is down. This is not exactly true, since there is a possibility - to only have compute service down, while all VMs that are running on the - host, are actually up. There is no way to distinguish between two really - different things: host status and nova-compute status, which is deployed - on the host. - - Also, provided host information by API and commands, are service centric, - i.e."nova host-list" is just another wrapper for "nova service-list" with - different format (in fact "service-list" is a super set to "host-list"). - - - + Gap - - - Not all the health information of compute nodes can be provided. Seems like - nova is treating *host* term equally to *compute-host*, which might be misleading. - Such situations can be error prone for the case where there is a need to perform - host evacuation. - - -Related BP: - -Pacemaker and Corosync can provide info about the host. Therefore, there is -requirement to have nova support the pacemaker service group driver. There could -be another option by adding tooz servicegroup driver to nova, and then have to -support corosync driver. - - + https://blueprints.launchpad.net/nova/+spec/tooz-for-service-groups - -Doctor team is not working on this blueprint - -NOTE: This bp is active. A suggestion is to adopt this bp and add a corosync -driver to tooz. Could be a solution. - -We should keep following this bp, when it finished, see if we could add a -corosync driver for tooz to close this gap. - -Here are the currently supported driver in tooz. -https://github.com/openstack/tooz/blob/master/doc/source/drivers.rst Meanwhile, -we should also look into the doctor project and see if this could be solved. - -This work is still underway, but, doesn't directly map to the gap that it is -identified above. Doctor team looking to get faster updates on node status and -failure status - these are other blueprints. These are good problems to solve. - -GAP 3: Store consoleauth tokens to the database -=============================================== - -* Type: 'performance' -* Description: - -+ Desired state - - - Change the consoleauth service to store the tokens in the databaseand, optionally, - cache them in memory as it does now for fast access. - -+ Current State - - - Currently the consoleauth service is storing the tokens and theconnection data - only in memory. This behavior makes impossible to have multipleinstances of this - service in a cluster as there is no way for one of theisntances to know the tokens - issued by the other. - - - The consoleauth service can use a memcached server to store those tokens,but again, - if we want to share them among different instances of it we would berelying in one - memcached server which makes this solution unsuitable for a highly available - architecture where we should be able to replicate all ofthe services in our cluster. - -+ Gap - - - The consoleauth service is storing the tokens and the connection data only in memory. - This behavior makes impossible to have multiple instances of this service in a cluster - as there is no way for one of the instances to know the tokens issued by the other. - -* Related BP - - + https://blueprints.launchpad.net/nova/+spec/consoleauth-tokens-in-db - - The advise in the blueprint is to use memcached as a backend. Looking to the - documentation memcached is not able to replicate data, so this is not a - complete solution. But maybe redis (http://redis.io/) is a suitable backend - to store the tokens that survive node failures. This blueprint is not - directly needed for this gap. - -Findings: - -This bp has been rejected since the community feedback is that A/A can be -supported by memcacheD. The usecase for this bp is not quite clear, since when -the consoleauth service is done and the token is lost, the other service can -retrieve the token again after it recovers. Can be accomplished through a -different configuration set up for OpenStack. Therefore not a gap. -Recommendation of the team is to verify the redis approach. - - -GAP 4: Active/Active HA of cinder-volume -======================================== - -* Type: 'reliability/scalability' - -* Description: - - + Desired State: - - - Cinder-volume can run in an active/active configuration. - - + Current State: - - - Only one cinder-volume instance can be active. Failover to be handledby - external mechanism such as pacemaker/corosync. - - + Gap - - - Cinder-volume doesn't supprt active/active configuration. - -* Related BP - - + https://blueprints.launchpad.net/cinder/+spec/cinder-volume-active-active-support - -* Findings: - - + This blueprint underway for Newton - as of July 6, 2016 great progress has - been made, we will continue to monitor the progress. - -GAP 5: Cinder volume multi-attachment -===================================== - -* Type: 'reliability' -* Description: - - + Desired State - - - Cinder volumes can be attached to multiple VMs at the same time. So that - active/standby stateful VNFs can share the same Cinder volume. - - + Current State - - - Cinder volumes can only be attached to one VM at a time. - - + Gap - - - Nova and cinder do not allow for multiple simultaneous attachments. - -* Related BP - - + https://blueprints.launchpad.net/openstack/?searchtext=multi-attach-volume - -* Findings - - + Multi-attach volume is still WIP in OpenStack. There is coordination work required with Nova. - + At risk for Newton - + Recommend adding a Yardstick test case. - -General comment for the next release. Remote volume replication is another -important project for storage HA. -The HA team will monitor this multi-blueprint activity that will span multiple -OpenStack releases. The blueprints aren't approved yet and there dependencies -on generic-volume-group. - - - -GAP 6: HA tests improvements in fuel -==================================== - -* Type: 'robustness' -* Description: - - + Desired State - - Increased test coverage for HA during install - + Current State - - A few test cases are available - - * Related BP - - - https://blueprints.launchpad.net/fuel/+spec/ha-test-improvements - - Tie in with the test plans we have discussed previously. - - Look at Yardstick tests that could be proposed back to Openstack. - - Discussions planned with Yardstick team to engage with Openstack community to enhance Fuel or Tempest as appropriate. - - -Next Steps: -^^^^^^^^^^^ - -The six gaps above demonstrate that on going progress is being made in various -OPNFV and OpenStack communities. The OPNFV-HA team will work to suggest -blueprints for the next OpenStack Summit to help continue the progress of high -availability in the community. diff --git a/docs/userguide/Deployment_Guideline.pdf b/docs/userguide/Deployment_Guideline.pdf Binary files differdeleted file mode 100644 index 3e32429..0000000 --- a/docs/userguide/Deployment_Guideline.pdf +++ /dev/null diff --git a/docs/userguide/Deployment_Guideline.rst b/docs/userguide/Deployment_Guideline.rst deleted file mode 100644 index 7d3b018..0000000 --- a/docs/userguide/Deployment_Guideline.rst +++ /dev/null @@ -1,452 +0,0 @@ -This document will provide an overall framework for the high availability -deployment of NFV system. It will also continiously update to include HA -deployment guidelines and suggestions for the releases of OPNFV. - -********************************************************************* -Overview of High Available Deployment of OPNFV -********************************************************************* - -In this section, we would like to discuss the overall HA deployment of NFV system. -Different modules, such as hardware,VIM,VMs and etc, will be included, and HA -deployment of each single module will be discussed. However, not all of these HA -schemes should be deployed in on system at the same time. For the HA deployment of -a single system, we should consider the tradeoff between high availability and the -cost and resource to leverage. - - -Architecture of HA deployment -================================================================== - -This section intends to introduce the different modules we should consider -when talking about HA deployment. These moduels include the Hardware -(compute, network, storage hardware), the VIM, the hypervisor, VMs and VNFs. -HA schemes for these different moduels should all be considered when deploying -an NFV system. And the schemes should be coordinated so that the system can make -sure to react in its best way when facing failure. - -The following picture shows the the architecture of HA deployment based on the -framework from ETSI NFV ISG. - -.. figure:: Overview.png - :alt: Architecture for HA Deployment - :figclass: align-center - - Fig 1. Architecture of HA Deployment based on the Framework of ETSI NFV ISG - -HA deployment topology -================================================================== - -This section will introduce the HA deployment topology for an NFV system. -The topology explained in this section is to support the software -cluster of OPNFV platform, which we will discuss in detail in section1.3. - -The typical topology of deployment OPNFV platform should include at -least the controller nodes, and the compute nodes. Depend on the request of -the users, standalone network nodes or storage nodes can be added into this -topology. The simplest HA deployment of OPNFV only include the control nodes. Further -HA schemes can be provided to the compute nodes, the network nodes and the storage -nodes, according to the requirement of services deployed on the NFV system. -Figure 2 shows the deployment topology, in which the controller nodes are all in -a cluster, and the compute nodes can be in another cluster. - -The control node cluster here is to provide HA for the controller services, so -that the services on the control node can successfully failover when failure -happens and the service can continue. The cluster service should also provide -automatic recovery for the control nodes. For OPNFV, the control node cluster -should include at least 3 nodes, and should be an odd number if the cluster -management system use quorum. This may change if we use different cluster -management schemes though. - -The compute node clusters is responsible for providing HA for the services running -on the compute nodes. These services may include agents for openstack, host os, -hypervisors. Such cluster is responsible for the recovery and repair -of the services. However, compute node cluster will certainly bring complexity to -the whole system, and would increase the cost. There could be multiple solutions -for the compute cluster, e.g., senlin from openstack. - -There could be other HA solutions for the compute nodes except for cluster. Combination -of congress and doctor can be one of them, in which doctor provides quickly notification -of failure to the VIM, and congress provides proper recovery procedure. In such scheme, -the compute nodes are not recovered by the cluster scheme, but recovered under the -supervision of VIM. - -.. figure:: topology_control_compute.png - :alt: HA Deployment Topology of Control Nodes and Compute Nodes - :figclass: align-center - - Fig 2. HA Deployment Topology of Control Nodes and Compute Nodes - -When the cloud is supporting heavy network traffic, which is often the case for the data -plane services in the Telecom scenarios, it is necessary to deploy standalone network -nodes for openstack, so that the large amont of traffic switching and routing will not -bring extra load to the controller nodes. In figure 3, we add network nodes into the -topology and shows how to deploy it in a high available way. In this figure, the -network nodes are deployed in a cluster. The cluster will provide HA for the services -runing on the network nodes. Such cluster scheme could be the same with that of the -compute nodes. - -On thing to be notify is that all hosts in the NFV system should have at least two NICs -that are bonded via LACP. - -.. figure:: topology_control_compute_network.png - :alt: HA Deployment Topology of Control Nodes and Compute Nodes and Network Nodes - :figclass: align-center - - Fig 3. HA Deployment Topology of Control Nodes, Compute Nodes and network Nodes - -The HA deployment for storage can be different for all different storage schemes. We will -discuss the detail of the storage HA deployment in section 1.3.3 - -Software HA Framework -================================================================== - -In this section, we introduce more details about the HA schemes for a complete NFV system. - -Openstack Controller services (Openstack services) --------------------------------------------------------- - -For the High Availability of OpenStack Controller nodes, Pacemaker and Corosync are -often used. The following texts are refering from the HA guideline of OpenStack, which -gives an example of solution of HA deployment.(http://docs.openstack.org/ha-guide/) - -At its core, a cluster is a distributed finite state machine capable of co-ordinating the startup and recovery -of inter-related services across a set of machines. For OpenStack Controller nodes, a cluster management system, -such as Pacemaker, is recommended to use to provide the following metrics. - -1, Awareness of other applications in the stack - -2, Awareness of instances on other machines - -3, A shared implementation and calculation of quorum. - -4, Data integrity through fencing (a non-responsive process does not imply it is not doing anything) - -5, Automated recovery of failed instances - -Figure 4 shows the details of HA schemes for Openstack controller nodes with Pacemaker. - -.. figure:: HA_control.png - :alt: HA Deployment of Openstack Control Nodes based on Pacemaker - :figclass: align-center - - Fig 4. HA Deployment of Openstack Control Nodes based on Pacemaker - -High availability of all stateless services are provided by pacemaker and HAProxy. - -Pacemaker cluster stack is the state-of-the-art high availability and load -balancing stack for the Linux platform. Pacemaker is useful to make OpenStack -infrastructure highly available. Also, it is storage and application-agnostic, -and in no way specific to OpenStack. - -Pacemaker relies on the Corosync messaging layer for reliable cluster -communications. Corosync implements the Totem single-ring ordering and -membership protocol. It also provides UDP and InfiniBand based messaging, -quorum, and cluster membership to Pacemaker. - -Pacemaker does not inherently (need or want to) understand the applications -it manages. Instead, it relies on resource agents (RAs), scripts that -encapsulate the knowledge of how to start, stop, and check the health -of each application managed by the cluster.These agents must conform -to one of the OCF, SysV Init, Upstart, or Systemd standards.Pacemaker -ships with a large set of OCF agents (such as those managing MySQL -databases, virtual IP addresses, and RabbitMQ), but can also use any -agents already installed on your system and can be extended with your -own (see the developer guide). - -After deployment of Pacemaker, HAProxy is used to provide VIP for all the -OpenStack services and act as load balancer. HAProxy provides a fast and -reliable HTTP reverse proxy and load balancer for TCP or HTTP applications. -It is particularly suited for web crawling under very high loads while -needing persistence or Layer 7 processing. It realistically supports tens -of thousands of connections with recent hardware. - -Each instance of HAProxy configures its front end to accept connections -only from the virtual IP (VIP) address and to terminate them as a list -of all instances of the corresponding service under load balancing, such -as any OpenStack API service. This makes the instances of HAProxy act -independently and fail over transparently together with the network endpoints -(VIP addresses) failover and, therefore, shares the same SLA. - -We can alternatively use a commercial load balancer, which is a hardware or -software. A hardware load balancer generally has good performance. - -Galera Cluster, or other database cluster service, should also be deployed -to provide data replication and synchronization between data base. Galera -Cluster is a synchronous multi-master database cluster, based on MySQL and -the InnoDB storage engine. It is a high-availability service that provides -high system uptime, no data loss, and scalability for growth. The selection -of DB also will have potential influence on the behaviour on the application -code. For instance using Galera Clusterl may give you higher concurrent write -perfomance but may require a more complex conflict resolution. - -We can also achieve high availability for the OpenStack database in many different -ways, depending on the type of database that we are using. There are three -implementations of Galera Cluster available: - -1, Galera Cluster for MySQL The MySQL reference implementation from Codership; - -2, MariaDB Galera Cluster The MariaDB implementation of Galera Cluster, which is -commonly supported in environments based on Red Hat distributions; - -3, Percona XtraDB Cluster The XtraDB implementation of Galera Cluster from Percona. - -In addition to Galera Cluster, we can also achieve high availability through other -database options, such as PostgreSQL, which has its own replication system. - -To make the RabbitMQ high available, Rabbit HA queue should be configued, and all -openstack services should be configurd to use the Rabbit HA queue. - -In the meantime, specific schemes should also be provided to avoid single point of -failure of Pacemaker. And services failed should be automaticly repaired. - -Note that the scheme we described above is just one possible scheme for the HA -deployment of the controller nodes. Other schemes can also be used to provide cluster -management and monitoring. - -SDN controller services ---------------------------------------- - -SDN controller software is data intensive application. All static and dynamic data has -one or more duplicates distributed to other physical nodes in cluster. Built-in HA schema -always be concordant with data distribution and built-in mechanism will select or -re-select master nodes in cluster. In deployment stage software of SDN controller -should be deployed to at least two or more physical nodes regardless whether the -software is deployed inside VM or containner. Dual management network plane should -be provided for SDN controller cluster to support built-in HA schema. - -Storage ----------------------------------------- -Depending on what storage scheme deployed, different HA schemes should be used. The following -text are refering from the Mirantis OpenStack reference architecture, which provides suggestions -on the HA deployment of different storage schemes. - -1, Ceph - -Ceph implements its own HA. When deploying it, enough controller nodes running the Ceph Monitor -service to form a quarum, and enough Ceph OSD nodes to satisfy the object replication factor are -needed. - -2, Swift - -Swift API relies on the same HAProxy setup with VIP on controller nodes as the other REST -APIs. For small scale deployment, swift storage and Proxy services can be deployed on the -controller nodes. However, for a larger production environment, dedicated storage nodes, in -which two for swift proxy and at least three for swift storage, are needed. - - - -Host OS and Hypervisor ---------------------------------------- - -The Host OS and Hypervisor should be supervised and monitored for failure, and should be -repaired when failure happens. Such supervision can based on a cluster scheme, or can -just simply use controller to constantly monitor the computer host. Figure 6 shows a -simplified framework for hypervisor cluster. - -When host/hypervisor failure happens, VMs on that host should be evacuated. However, -such scheme should coordinate with the VM HA scheme, so that when both the host and the -VM detect the failure, they should know who should take responsibility for the evacuation. - - -.. figure:: HA_Hypervisor.png - :alt: HA Deployment of Host OS and Hypervisor - :figclass: align-center - - Fig 5. HA Deployment of Host OS and Hypervisor - -Virtual Machine (VM) ---------------------------------------- - -VM should be supervised and monitored for failure, and should be repaired when failure -happens. We can rely on the hypervisor to monitor the VM failure. Another scheme can be -used is a cluster for the VM, in which failure of VMs in one cluster can be supervised -and will be repaired by the cluster manager. Pacemaker and other cluster management -schemes can be considered for the VM cluster. - -In case when VNFs do not have HA schemes, extra HA scheme for VM should be taken into -consideration. Such approach is kind of best effort for the NFV platform to provide HA -for the VNF service, and may lead to failure copy between VMs when VNF fails. Since the -NFVI can hardly know of the service runing in the VNF, it is imporssible for the NFVI -level to provide overall HA solution for the VNF services. Therefore, even though we -mention this scheme here, we strongly suggest the VNF should have its own HA schemes. - -Figure 6 gives an example for the VM active/standby deployment. In this case, both the -active VM and the standby VM are deployed with the same VNF image. When failure happens -to the active VM, the standby VM should take the traffic and replace the active VM. Such -scheme is the best effort of the NFVI when VNFs do not have HA schemes and would only -rely on VMs to provide redundancy. However, for stateful VNFs, there should be data copy -between the active VM and standby VM. In this case, fault for the active VM can also be -copied to the standby VM, leading to failure of the new active VM. - -.. figure:: HA_VM.png - :alt: VM Active/Standby Deployment - :figclass: align-center - - Fig 6. VM Active/Standby Deployment - -Virtual Network Functions (VNF) ---------------------------------------- - -For telecom services, it is suggested that VNFs should have its own built-in HA schemes -or HA schemes implemented in VNF Managerhave to provide high available services to -the customers. HA schemes for the VNFs can based on cluster. In this case, OpenSAF, -pacemaker and other cluster management services can be used. - -HA schemes for the VNFs should be coordinate with the lower layer. For example, it -should be clear which level will take responsibility for VM restart. A suggested -schemes could be, the VNF layer should be responsible for the redundancy and failover -of the VNFs when failure happens. Such failover should take place in quite a short -time (less then seconds). The repairing procedure will then take place from upper -layer to lower layer, that is, the VNF layer will first check if the failure is at -its layer, and should try to repair itself. If it fails to repaire the failure, -the failure should escalate to lower layers and let the NFVI layer to do the repair -work. There could also be cases that the NFVI layer has detected the failure and will -repair it before the escalation. These functions should be complished by the coordination -of all different component, including the VNFM, VIM, VNFs and NFVI. - -In the meantime, the VNFs can take advantage of API the hypervisor can provide to -them to enhance HA. Such API may include constant health check from the hypervisor, -affinity/inaffinity deployment support. example about watchdog - -Figure 7 gives an example for the VNF HA scheme. - -.. figure:: HA_VNF.png - :alt: HA Deployment of VNFs - :figclass: align-center - - Fig 7. HA Deployment of VNFs - -********************************************************************************* -HA deployment guideline for OPNFV releases -********************************************************************************* - -In this section, we will continiously update the HA deployment guideline for the releases -of OPNFV. - -HA deployment guideline for Arno -============================================== - -Deployment Framework ------------------------------------------------ - -Figure 8 shows an overall architecture for the HA deployment of ARNO. - -.. figure:: HA_ARNO.png - :alt: HA Deployment of OPNFV ARNO release - :figclass: align-center - - Fig 8. HA Deployment of OPNFV ARNO release - -For OPNFV Arno release, HA deployment of Openstack Control Node (Openstack Juno) and ODL -controller (ODL Helium) is supported. Both deployment tools (fuel and forman)support -such HA deployment. - -For such HA deployment, the following components¡¯ failure is protected - -Software: -* Nova scheduler -* Nova conductor -* Cinder scheduler -* Neutron server -* Heat engine - -Controller hardware: -* dead server -* dead switch -* dead port -* dead disk -* full disk - - -HA test result for ARNO -------------------------------------------------- - -Two specific High Availability testcases are done on the ARNO release. These test cases -are collaboratively developed by the High Availability project and the Yardstick project. - -Both cases are excuted in the China Mobile's Lab, where ARNO SR1 release is deployed with -Fuel. - -The two testcases respectively test the following two aspects: - -1, Controll Node Service HA - -In this test, HA of "nova-api" is tested. According to the result, the service can -successfully failover to the other controller nodes within 2.36s, once failure happens -at the active node. However, the service can't repair itself automatically. more -explaination about the repair, other services are not tested yet. - -2, Control Node Hardware HA - -In this test, HA of the controller node hardware is tested. One of the hardware is -abnormally shutdown, and the service of "nova-api" is monitored. According to the test -results, the service can failover to the other controller node within 10.71 secondes. -However, the failed hardware can't automatically repair itself. - -See more details about these test cases in the Yardstick doc of "Test Results for -yardstick-opnfv-ha"(https://gerrit.opnfv.org/gerrit/#/c/7543/). - -From these basic test cases we can see that OPNFV ARNO has integrated with some HA -schemes in its controller nodes. However, its capability of self repair should be -enhanced. - -HA deployment guideline for Brahmaputra -============================================== -In the Brahmaputra release, 4 installers are provided. We will discuss about the HA -deployment of each installer. - -Apex ----------------------------------------------------- - -For the installer of Apex, all of the OpenStack services are in HA on all 3 controllers. -The services are monitored by pacemaker and load balanced by HA Proxy with VIPs. The -SDN controllers usually only run as a single instance on the first controller with no -HA scheme. - -Database is clustered with galera in an active passive failover via pacemaker and the -message bus is rabbitHA and the services are managed by pacemaker. - -Storage is using ceph, clustered across the control nodes. - -In the future, more work is on the way to provide HA for the SDN controller. The Apex -team has already finished a demo that runs ODL on each controller, load balanced to -neutron via a VIP + HA Proxy, but is not using pacemaker. Meanwhile, they are also -working to include ceph storage HA for compute nodes as well. - -Compass ---------------------------------------------------------- -TBD - -Fuel -------------------------------------------------------------- - -At moment Fuel installer support the following HA schemes. - -1)Openstackcontrollers: N-way redundant (1,3,5, etc) -2)OpenDaylight:No redundancy -3)Cephstorage OSD: N-way redundant (1,3,5, etc) -4)Networkingattachment redundancy: LAG -5)NTPredundancy: N-way relays, up to 3 upstream sources -6)DNSredundancy: N-way relays, up to 3 upstream sources -7)DHCP:1+1 - -JOID ---------------------------------------------------------- - -JOID provides HA based on openstack services. Individual service charms have been -deployed in a container within a host, and each charms are distributed in a way each -service which meant for HA will go into container on individual nodes. For example -keystone service, there are three containers on each control node and VIP has been -assigned to use by the front end API to use keystone. So in case any of the container -fails VIP will keep responding to via the other two services. As HA can be maintainer -with odd units at least one service container is required to response. - - -Reference -========== - -* https://www.rdoproject.org/ha/ha-architecture/ -* http://docs.openstack.org/ha-guide/ -* https://wiki.opnfv.org/display/availability?preview=/2926706/2926714/scenario_analysis_for_high_availability_in_nfv.pdf -* https://wiki.opnfv.org/display/availability?preview=/2926706/2926708/ha_requirement.pdf - diff --git a/docs/userguide/Deployment_Guideline.rst.bak b/docs/userguide/Deployment_Guideline.rst.bak deleted file mode 100644 index 6b04dc7..0000000 --- a/docs/userguide/Deployment_Guideline.rst.bak +++ /dev/null @@ -1,452 +0,0 @@ -This document will provide an overall framework for the high availability -deployment of NFV system. It will also continiously update to include HA -deployment guidelines and suggestions for the releases of OPNFV. - -********************************************************************* -Overview of High Available Deployment of OPNFV -********************************************************************* - -In this section, we would like to discuss the overall HA deployment of NFV system. -Different modules, such as hardware,VIM,VMs and etc, will be included, and HA -deployment of each single module will be discussed. However, not all of these HA -schemes should be deployed in on system at the same time. For the HA deployment of -a single system, we should consider the tradeoff between high availability and the -cost and resource to leverage. - - -Architecture of HA deployment -================================================================== - -This section intends to introduce the different modules we should consider -when talking about HA deployment. These moduels include the Hardware -(compute, network, storage hardware), the VIM, the hypervisor, VMs and VNFs. -HA schemes for these different moduels should all be considered when deploying -an NFV system. And the schemes should be coordinated so that the system can make -sure to react in its best way when facing failure. - -The following picture shows the the architecture of HA deployment based on the -framework from ETSI NFV ISG. - -.. figure:: Overview.png - :alt: Architecture for HA Deployment - :figclass: align-center - - Fig 1. Architecture of HA Deployment based on the Framework of ETSI NFV ISG - -HA deployment topology -================================================================== - -This section will introduce the HA deployment topology for an NFV system. -The topology explained in this section is to support the software -cluster of OPNFV platform, which we will discuss in detail in section1.3. - -The typical topology of deployment OPNFV platform should include at -least the controller nodes, and the compute nodes. Depend on the request of -the users, standalone network nodes or storage nodes can be added into this -topology. The simplest HA deployment of OPNFV only include the control nodes. Further -HA schemes can be provided to the compute nodes, the network nodes and the storage -nodes, according to the requirement of services deployed on the NFV system. -Figure 2 shows the deployment topology, in which the controller nodes are all in -a cluster, and the compute nodes can be in another cluster. - -The control node cluster here is to provide HA for the controller services, so -that the services on the control node can successfully failover when failure -happens and the service can continue. The cluster service should also provide -automatic recovery for the control nodes. For OPNFV, the control node cluster -should include at least 3 nodes, and should be an odd number if the cluster -management system use quorum. This may change if we use different cluster -management schemes though. - -The compute node clusters is responsible for providing HA for the services running -on the compute nodes. These services may include agents for openstack, host os, -hypervisors. Such cluster is responsible for the recovery and repair -of the services. However, compute node cluster will certainly bring complexity to -the whole system, and would increase the cost. There could be multiple solutions -for the compute cluster, e.g., senlin from openstack. - -There could be other HA solutions for the compute nodes except for cluster. Combination -of congress and doctor can be one of them, in which doctor provides quickly notification -of failure to the VIM, and congress provides proper recovery procedure. In such scheme, -the compute nodes are not recovered by the cluster scheme, but recovered under the -supervision of VIM. - -.. figure:: topology_control_compute.png - :alt: HA Deployment Topology of Control Nodes and Compute Nodes - :figclass: align-center - - Fig 2. HA Deployment Topology of Control Nodes and Compute Nodes - -When the cloud is supporting heavy network traffic, which is often the case for the data -plane services in the Telecom scenarios, it is necessary to deploy standalone network -nodes for openstack, so that the large amont of traffic switching and routing will not -bring extra load to the controller nodes. In figure 3, we add network nodes into the -topology and shows how to deploy it in a high available way. In this figure, the -network nodes are deployed in a cluster. The cluster will provide HA for the services -runing on the network nodes. Such cluster scheme could be the same with that of the -compute nodes. - -On thing to be notify is that all hosts in the NFV system should have at least two NICs -that are bonded via LACP. - -.. figure:: topology_control_compute_network.png - :alt: HA Deployment Topology of Control Nodes and Compute Nodes and Network Nodes - :figclass: align-center - - Fig 3. HA Deployment Topology of Control Nodes, Compute Nodes and network Nodes - -The HA deployment for storage can be different for all different storage schemes. We will -discuss the detail of the storage HA deployment in section 1.3.3 - -Software HA Framework -================================================================== - -In this section, we introduce more details about the HA schemes for a complete NFV system. - -Openstack Controller services (Openstack services) --------------------------------------------------------- - -For the High Availability of OpenStack Controller nodes, Pacemaker and Corosync are -often used. The following texts are refering from the HA guideline of OpenStack, which -gives an example of solution of HA deployment.(http://docs.openstack.org/ha-guide/) - -At its core, a cluster is a distributed finite state machine capable of co-ordinating the startup and recovery -of inter-related services across a set of machines. For OpenStack Controller nodes, a cluster management system, -such as Pacemaker, is recommended to use to provide the following metrics. - -1, Awareness of other applications in the stack - -2, Awareness of instances on other machines - -3, A shared implementation and calculation of quorum. - -4, Data integrity through fencing (a non-responsive process does not imply it is not doing anything) - -5, Automated recovery of failed instances - -Figure 4 shows the details of HA schemes for Openstack controller nodes with Pacemaker. - -.. figure:: HA_control.png - :alt: HA Deployment of Openstack Control Nodes based on Pacemaker - :figclass: align-center - - Fig 4. HA Deployment of Openstack Control Nodes based on Pacemaker - -High availability of all stateless services are provided by pacemaker and HAProxy. - -Pacemaker cluster stack is the state-of-the-art high availability and load -balancing stack for the Linux platform. Pacemaker is useful to make OpenStack -infrastructure highly available. Also, it is storage and application-agnostic, -and in no way specific to OpenStack. - -Pacemaker relies on the Corosync messaging layer for reliable cluster -communications. Corosync implements the Totem single-ring ordering and -membership protocol. It also provides UDP and InfiniBand based messaging, -quorum, and cluster membership to Pacemaker. - -Pacemaker does not inherently (need or want to) understand the applications -it manages. Instead, it relies on resource agents (RAs), scripts that -encapsulate the knowledge of how to start, stop, and check the health -of each application managed by the cluster.These agents must conform -to one of the OCF, SysV Init, Upstart, or Systemd standards.Pacemaker -ships with a large set of OCF agents (such as those managing MySQL -databases, virtual IP addresses, and RabbitMQ), but can also use any -agents already installed on your system and can be extended with your -own (see the developer guide). - -After deployment of Pacemaker, HAProxy is used to provide VIP for all the -OpenStack services and act as load balancer. HAProxy provides a fast and -reliable HTTP reverse proxy and load balancer for TCP or HTTP applications. -It is particularly suited for web crawling under very high loads while -needing persistence or Layer 7 processing. It realistically supports tens -of thousands of connections with recent hardware. - -Each instance of HAProxy configures its front end to accept connections -only from the virtual IP (VIP) address and to terminate them as a list -of all instances of the corresponding service under load balancing, such -as any OpenStack API service. This makes the instances of HAProxy act -independently and fail over transparently together with the network endpoints -(VIP addresses) failover and, therefore, shares the same SLA. - -We can alternatively use a commercial load balancer, which is a hardware or -software. A hardware load balancer generally has good performance. - -Galera Cluster, or other database cluster service, should also be deployed -to provide data replication and synchronization between data base. Galera -Cluster is a synchronous multi-master database cluster, based on MySQL and -the InnoDB storage engine. It is a high-availability service that provides -high system uptime, no data loss, and scalability for growth. The selection -of DB also will have potential influence on the behaviour on the application -code. For instance using Galera Clusterl may give you higher concurrent write -perfomance but may require a more complex conflict resolution. - -We can also achieve high availability for the OpenStack database in many different -ways, depending on the type of database that we are using. There are three -implementations of Galera Cluster available: - -1, Galera Cluster for MySQL The MySQL reference implementation from Codership; - -2, MariaDB Galera Cluster The MariaDB implementation of Galera Cluster, which is -commonly supported in environments based on Red Hat distributions; - -3, Percona XtraDB Cluster The XtraDB implementation of Galera Cluster from Percona. - -In addition to Galera Cluster, we can also achieve high availability through other -database options, such as PostgreSQL, which has its own replication system. - -To make the RabbitMQ high available, Rabbit HA queue should be configued, and all -openstack services should be configurd to use the Rabbit HA queue. - -In the meantime, specific schemes should also be provided to avoid single point of -failure of Pacemaker. And services failed should be automaticly repaired. - -Note that the scheme we described above is just one possible scheme for the HA -deployment of the controller nodes. Other schemes can also be used to provide cluster -management and monitoring. - -SDN controller services ---------------------------------------- - -SDN controller software is data intensive application. All static and dynamic data has -one or more duplicates distributed to other physical nodes in cluster. Built-in HA schema -always be concordant with data distribution and built-in mechanism will select or -re-select master nodes in cluster. In deployment stage software of SDN controller -should be deployed to at least two or more physical nodes regardless whether the -software is deployed inside VM or containner. Dual management network plane should -be provided for SDN controller cluster to support built-in HA schema. - -Storage ----------------------------------------- -Depending on what storage scheme deployed, different HA schemes should be used. The following -text are refering from the Mirantis OpenStack reference architecture, which provides suggestions -on the HA deployment of different storage schemes. - -1, Ceph - -Ceph implements its own HA. When deploying it, enough controller nodes running the Ceph Monitor -service to form a quarum, and enough Ceph OSD nodes to satisfy the object replication factor are -needed. - -2, Swift - -Swift API relies on the same HAProxy setup with VIP on controller nodes as the other REST -APIs. For small scale deployment, swift storage and Proxy services can be deployed on the -controller nodes. However, for a larger production environment, dedicated storage nodes, in -which two for swift proxy and at least three for swift storage, are needed. - - - -Host OS and Hypervisor ---------------------------------------- - -The Host OS and Hypervisor should be supervised and monitored for failure, and should be -repaired when failure happens. Such supervision can based on a cluster scheme, or can -just simply use controller to constantly monitor the computer host. Figure 6 shows a -simplified framework for hypervisor cluster. - -When host/hypervisor failure happens, VMs on that host should be evacuated. However, -such scheme should coordinate with the VM HA scheme, so that when both the host and the -VM detect the failure, they should know who should take responsibility for the evacuation. - - -.. figure:: HA_Hypervisor.png - :alt: HA Deployment of Host OS and Hypervisor - :figclass: align-center - - Fig 5. HA Deployment of Host OS and Hypervisor - -Virtual Machine (VM) ---------------------------------------- - -VM should be supervised and monitored for failure, and should be repaired when failure -happens. We can rely on the hypervisor to monitor the VM failure. Another scheme can be -used is a cluster for the VM, in which failure of VMs in one cluster can be supervised -and will be repaired by the cluster manager. Pacemaker and other cluster management -schemes can be considered for the VM cluster. - -In case when VNFs do not have HA schemes, extra HA scheme for VM should be taken into -consideration. Such approach is kind of best effort for the NFV platform to provide HA -for the VNF service, and may lead to failure copy between VMs when VNF fails. Since the -NFVI can hardly know of the service runing in the VNF, it is imporssible for the NFVI -level to provide overall HA solution for the VNF services. Therefore, even though we -mention this scheme here, we strongly suggest the VNF should have its own HA schemes. - -Figure 6 gives an example for the VM active/standby deployment. In this case, both the -active VM and the standby VM are deployed with the same VNF image. When failure happens -to the active VM, the standby VM should take the traffic and replace the active VM. Such -scheme is the best effort of the NFVI when VNFs do not have HA schemes and would only -rely on VMs to provide redundancy. However, for stateful VNFs, there should be data copy -between the active VM and standby VM. In this case, fault for the active VM can also be -copied to the standby VM, leading to failure of the new active VM. - -.. figure:: images/HA_VM.png - :alt: VM Active/Standby Deployment - :figclass: align-center - - Fig 6. VM Active/Standby Deployment - -Virtual Network Functions (VNF) ---------------------------------------- - -For telecom services, it is suggested that VNFs should have its own built-in HA schemes -or HA schemes implemented in VNF Managerhave to provide high available services to -the customers. HA schemes for the VNFs can based on cluster. In this case, OpenSAF, -pacemaker and other cluster management services can be used. - -HA schemes for the VNFs should be coordinate with the lower layer. For example, it -should be clear which level will take responsibility for VM restart. A suggested -schemes could be, the VNF layer should be responsible for the redundancy and failover -of the VNFs when failure happens. Such failover should take place in quite a short -time (less then seconds). The repairing procedure will then take place from upper -layer to lower layer, that is, the VNF layer will first check if the failure is at -its layer, and should try to repair itself. If it fails to repaire the failure, -the failure should escalate to lower layers and let the NFVI layer to do the repair -work. There could also be cases that the NFVI layer has detected the failure and will -repair it before the escalation. These functions should be complished by the coordination -of all different component, including the VNFM, VIM, VNFs and NFVI. - -In the meantime, the VNFs can take advantage of API the hypervisor can provide to -them to enhance HA. Such API may include constant health check from the hypervisor, -affinity/inaffinity deployment support. example about watchdog - -Figure 7 gives an example for the VNF HA scheme. - -.. figure:: HA_VNF.png - :alt: HA Deployment of VNFs - :figclass: align-center - - Fig 7. HA Deployment of VNFs - -********************************************************************************* -HA deployment guideline for OPNFV releases -********************************************************************************* - -In this section, we will continiously update the HA deployment guideline for the releases -of OPNFV. - -HA deployment guideline for Arno -============================================== - -Deployment Framework ------------------------------------------------ - -Figure 8 shows an overall architecture for the HA deployment of ARNO. - -.. figure:: HA_ARNO.png - :alt: HA Deployment of OPNFV ARNO release - :figclass: align-center - - Fig 8. HA Deployment of OPNFV ARNO release - -For OPNFV Arno release, HA deployment of Openstack Control Node (Openstack Juno) and ODL -controller (ODL Helium) is supported. Both deployment tools (fuel and forman)support -such HA deployment. - -For such HA deployment, the following components¡¯ failure is protected - -Software: -* Nova scheduler -* Nova conductor -* Cinder scheduler -* Neutron server -* Heat engine - -Controller hardware: -* dead server -* dead switch -* dead port -* dead disk -* full disk - - -HA test result for ARNO -------------------------------------------------- - -Two specific High Availability testcases are done on the ARNO release. These test cases -are collaboratively developed by the High Availability project and the Yardstick project. - -Both cases are excuted in the China Mobile's Lab, where ARNO SR1 release is deployed with -Fuel. - -The two testcases respectively test the following two aspects: - -1, Controll Node Service HA - -In this test, HA of "nova-api" is tested. According to the result, the service can -successfully failover to the other controller nodes within 2.36s, once failure happens -at the active node. However, the service can't repair itself automatically. more -explaination about the repair, other services are not tested yet. - -2, Control Node Hardware HA - -In this test, HA of the controller node hardware is tested. One of the hardware is -abnormally shutdown, and the service of "nova-api" is monitored. According to the test -results, the service can failover to the other controller node within 10.71 secondes. -However, the failed hardware can't automatically repair itself. - -See more details about these test cases in the Yardstick doc of "Test Results for -yardstick-opnfv-ha"(https://gerrit.opnfv.org/gerrit/#/c/7543/). - -From these basic test cases we can see that OPNFV ARNO has integrated with some HA -schemes in its controller nodes. However, its capability of self repair should be -enhanced. - -HA deployment guideline for Brahmaputra -============================================== -In the Brahmaputra release, 4 installers are provided. We will discuss about the HA -deployment of each installer. - -Apex ----------------------------------------------------- - -For the installer of Apex, all of the OpenStack services are in HA on all 3 controllers. -The services are monitored by pacemaker and load balanced by HA Proxy with VIPs. The -SDN controllers usually only run as a single instance on the first controller with no -HA scheme. - -Database is clustered with galera in an active passive failover via pacemaker and the -message bus is rabbitHA and the services are managed by pacemaker. - -Storage is using ceph, clustered across the control nodes. - -In the future, more work is on the way to provide HA for the SDN controller. The Apex -team has already finished a demo that runs ODL on each controller, load balanced to -neutron via a VIP + HA Proxy, but is not using pacemaker. Meanwhile, they are also -working to include ceph storage HA for compute nodes as well. - -Compass ---------------------------------------------------------- -TBD - -Fuel -------------------------------------------------------------- - -At moment Fuel installer support the following HA schemes. - -1)Openstackcontrollers: N-way redundant (1,3,5, etc) -2)OpenDaylight:No redundancy -3)Cephstorage OSD: N-way redundant (1,3,5, etc) -4)Networkingattachment redundancy: LAG -5)NTPredundancy: N-way relays, up to 3 upstream sources -6)DNSredundancy: N-way relays, up to 3 upstream sources -7)DHCP:1+1 - -JOID ---------------------------------------------------------- - -JOID provides HA based on openstack services. Individual service charms have been -deployed in a container within a host, and each charms are distributed in a way each -service which meant for HA will go into container on individual nodes. For example -keystone service, there are three containers on each control node and VIP has been -assigned to use by the front end API to use keystone. So in case any of the container -fails VIP will keep responding to via the other two services. As HA can be maintainer -with odd units at least one service container is required to response. - - -Reference -========== - -* https://www.rdoproject.org/ha/ha-architecture/ -* http://docs.openstack.org/ha-guide/ -* https://wiki.opnfv.org/display/availability?preview=/2926706/2926714/scenario_analysis_for_high_availability_in_nfv.pdf -* https://wiki.opnfv.org/display/availability?preview=/2926706/2926708/ha_requirement.pdf - diff --git a/docs/userguide/HA_ARNO.png b/docs/userguide/HA_ARNO.png Binary files differdeleted file mode 100644 index 4d59d41..0000000 --- a/docs/userguide/HA_ARNO.png +++ /dev/null diff --git a/docs/userguide/HA_Hypervisor.png b/docs/userguide/HA_Hypervisor.png Binary files differdeleted file mode 100644 index 4206a1e..0000000 --- a/docs/userguide/HA_Hypervisor.png +++ /dev/null diff --git a/docs/userguide/HA_VM.png b/docs/userguide/HA_VM.png Binary files differdeleted file mode 100644 index 68fbedf..0000000 --- a/docs/userguide/HA_VM.png +++ /dev/null diff --git a/docs/userguide/HA_VNF.png b/docs/userguide/HA_VNF.png Binary files differdeleted file mode 100644 index 000fe44..0000000 --- a/docs/userguide/HA_VNF.png +++ /dev/null diff --git a/docs/userguide/HA_control.png b/docs/userguide/HA_control.png Binary files differdeleted file mode 100644 index 3b82663..0000000 --- a/docs/userguide/HA_control.png +++ /dev/null diff --git a/docs/userguide/Overview.png b/docs/userguide/Overview.png Binary files differdeleted file mode 100644 index a860038..0000000 --- a/docs/userguide/Overview.png +++ /dev/null diff --git a/docs/userguide/topology_control_compute.png b/docs/userguide/topology_control_compute.png Binary files differdeleted file mode 100644 index 673aa46..0000000 --- a/docs/userguide/topology_control_compute.png +++ /dev/null diff --git a/docs/userguide/topology_control_compute_network.png b/docs/userguide/topology_control_compute_network.png Binary files differdeleted file mode 100644 index 7b2b582..0000000 --- a/docs/userguide/topology_control_compute_network.png +++ /dev/null diff --git a/docs/userguide/topology_control_compute_network_storage.png b/docs/userguide/topology_control_compute_network_storage.png Binary files differdeleted file mode 100644 index 84c7faf..0000000 --- a/docs/userguide/topology_control_compute_network_storage.png +++ /dev/null |
