********************** SNAPS-OO Library Usage ********************** The pattern used within the SNAPS-OO library for creating OpenStack instances have been made as consistent as possible amongst the different instance types. Each consists of a constructor that takes in a credentials object and generally takes in a single "settings" (configuration) object. The only exception to this rule is with the OpenStackVMInstance (creates an OpenStack Server) where it takes in the additional settings used for the associated image and SSH key-pairs credentials as those objects contain additional attributes required of SNAPS, primarily when one needs to obtain remote access. After instantiation, the create() method must be called to initiate all of the necessary remote API calls to OpenStack required for proper instance creation. SNAPS Credentials ================= As communicating with OpenStack is performed via secure remote RESTful API calls, any function or method performing any type of query or CRUD operation must know how to connect to the NFVI. The class ***OSCreds*** defined in *snaps.openstack.os\_credentials.py* contains everything required to connect to any Keystone v2.0 or v3 authorization server. The attributes are listed below: - username - password - auth\_url - project\_name (aka. tenant\_name) - identity\_api\_version (for obtaining Keystone authorization token. Versions 2.0 & v3 only validated.) - image\_api\_version (Glance version 1 currently only validated) - network\_api\_version (Neutron version 2 currently only validated) - compute\_api\_version (Nova version 2 currently only validated) - user\_domain\_id (default='default') - project\_domain\_id (default='default') - proxy\_settings - host (the HTTP proxy host) - port (the HTTP proxy port) - ssh\_proxy\_cmd (same as the value placed into ssh -o ProxyCommand='') Create OS Credentials Object ---------------------------- .. code:: python from snaps.openstack.os_credentials import OSCreds os_creds=OSCreds(username='admin', password='admin', auth_url='http://localhost:5000/v3', project_name='admin', identity_api_version=3) SNAPS Object Creators ===================== Each creator minimally requires an OSCreds object for connecting to the NFVI, associated \*Settings object for instance configuration, create() method to make the necessary remote API calls and create all of the necessary OpenStack instances required, and clean() method that is responsible for deleting all associated OpenStack instances. Please see the class diagram `here `__. Below is a textual representation of the requirements of each creator classes with their associated setting classes and a sample code snippet on how to use the code. Create User ----------- - User - snaps.openstack.create\_user.OpenStackUser - snaps.openstack.create\_user.UserSettings - name - the username (required) - password - the user's password (required) - project\_name - the name of the project to associated to this user (optional) - domain\_name - the user's domain (default='default') - email - the user's email address (optional) - enabled - flag to determine whether or not the user should be enabled (default=True) .. code:: python from snaps.openstack.create_user import UserSettings, OpenStackUser user_settings = UserSettings(name='username', password='password') user_creator = OpenStackUser(os_creds, user_settings) user_creator.create() # Retrieve OS creds for new user for creating other OpenStack instance user_creds = user_creator.get_os_creds(os_creds.project_name) # Perform logic ... # Cleanup user_creator.clean() Create Project -------------- - Project - snaps.openstack.create\_project.OpenStackProject - snaps.openstack.create\_project.ProjectSettings - name - the project name (required) - domain - the project's domain (default='default') - description - the project's description (optional) - enables - flag to determine whether or not the project should be enabled (default=True) .. code:: python from snaps.openstack.create_project import ProjectSettings, OpenStackProject project_settings = ProjectSettings(name='username', password='password') project_creator = OpenStackProject(os_creds, project_settings) project_creator.create() # Perform logic ... # Cleanup project_creator.clean() Create Flavor ------------- - Flavor - snaps.openstack.create\_flavor.OpenStackFlavor - snaps.openstack.create\_flavor.FlavorSettings - name - the flavor name (required) - flavor\_id - the flavor's string ID (default='auto') - ram - memory in MB to allocate to VM (required) - disk - disk storage in GB (required) - vcpus - the number of CPUs to allocate to VM (required) - ephemeral - the size of the ephemeral disk in GB (default=0) - swap - the size of the swap disk in GB (default=0) - rxtx\_factor - the receive/transmit factor to be set on ports if backend supports QoS extension (default=1.0) - is\_public - flag that denotes whether or not other projects can access image (default=True) .. code:: python from snaps.openstack.create_flavor import FlavorSettings, OpenStackFlavor flavor_settings = FlavorSettings(name='flavor-name', ram=4, disk=10, vcpus=2) flavor_creator = OpenStackFlavor(os_creds, flavor_settings) flavor_creator.create() # Perform logic ... # Cleanup flavor_creator.clean() Create Image ------------ - Image - snaps.openstack.create\_image.OpenStackImage - snaps.openstack.create\_image.ImageSettings - name - the image name (required) - image\_user - the default image user generally used by OpenStackVMInstance class for obtaining an SSH connection (required) - img\_format - the image's format (i.e. qcow2) (required) - url - the download URL to obtain the image file (this or image\_file must be configured, not both) - image\_file - the location of the file to be sourced from the local filesystem (this or url must be configured, not both) - nic\_config\_pb\_loc - the location of the ansible playbook that can configure additional NICs. Floating IPs are required to perform this operation. (optional) .. code:: python from snaps.openstack.create_image import ImageSettings, OpenStackImage image_settings = ImageSettings(name='image-name', image_user='ubuntu', img_format='qcow2', url='http://uec-images.ubuntu.com/releases/trusty/14.04/ubuntu-14.04-server-cloudimg-amd64-disk1.img') image_creator = OpenStackImage(os_creds, image_settings) image_creator.create() # Perform logic ... # Cleanup image_creator.clean() Create Keypair -------------- - Keypair - snaps.openstack.create\_keypair.OpenStackKeypair - snaps.openstack.create\_keypair.KeypairSettings - name - the keypair name (required) - public\_filepath - the file location to where the public key is to be written or currently resides (optional) - private\_filepath - the file location to where the private key file is to be written or currently resides (optional but highly recommended to leverage or the private key will be lost forever) .. code:: python from snaps.openstack.create_keypair import KeypairSettings, OpenStackKeypair keypair_settings = KeypairSettings(name='kepair-name', private_filepath='/tmp/priv-kp') keypair_creator = OpenStackKeypair(os_creds, keypair_settings) keypair_creator.create() # Perform logic ... # Cleanup keypair_creator.clean() Create Network -------------- - Network - snaps.openstack.create\_network.OpenStackNetwork - snaps.openstack.create\_network.NetworkSettings - name - the name of the network (required) - admin\_state\_up - flag denoting the administrative status of the network (True = up, False = down) - shared - flag indicating whether the network can be shared across projects/tenants (default=True) - project\_name - the name of the project (optional - can only be set by admin users) - external - flag determining if network has external access (default=False) - network\_type - the type of network (i.e. vlan\|vxlan\|flat) - physical\_network - the name of the physical network (required when network\_type is 'flat') - subnet\_settings (list of optional snaps.openstack.create\_network.SubnetSettings objects) - cidr - the subnet's CIDR (required) - ip\_version - 4 or 6 (default=4) - name - the subnet name (required) - project\_name - the name of the project (optional - can only be set by admin users) - start - the start address for the allocation pools - end - the end address for the allocation pools - gateway\_ip - the gateway IP - enable\_dhcp - flag to determine whether or not to enable DHCP (optional) - dns\_nameservers - a list of DNS nameservers - host\_routes - list of host route dictionaries for subnet (optional, see pydoc and Neutron API for more details) - destination - the destination for static route (optional) - nexthop - the next hop for the destination (optional) - ipv6\_ra\_mode - valid values include: 'dhcpv6-stateful', 'dhcp6v-stateless', 'slaac' (optional) - ipvc\_address\_mode - valid values include: 'dhcpv6-stateful', 'dhcp6v-stateless', 'slaac' (optional) .. code:: python from snaps.openstack.create_network import NetworkSettings, SubnetSettings, OpenStackNetwork subnet_settings = SubnetSettings(name='subnet-name', cidr='10.0.0.0/24') network_settings = NetworkSettings(name='network-name', subnet_settings=[subnet_settings]) network_creator = OpenStackNetwork(os_creds, network_settings) network_creator.create() # Perform logic ... # Cleanup network_creator.clean() Create Security Group --------------------- - Security Group - snaps.openstack.create\_security\_group.OpenStackSecurityGroup - snaps.openstack.create\_security\_group.SecurityGroupSettings - name - the security group's name (required) - description - the description (optional) - project\_name - the name of the project (optional - can only be set by admin users) - rule\_settings (list of optional snaps.openstack.create\_security\_group.SecurityGroupRuleSettings objects) - sec\_grp\_name - the name of the associated security group (required) - description - the description (optional) - direction - enum snaps.openstack.create\_security\_group.Direction (required) - remote\_group\_id - the group ID to associate with this rule - protocol - enum snaps.openstack.create\_security\_group.Protocol (optional) - ethertype - enum snaps.openstack.create\_security\_group.Ethertype (optional) - port\_range\_min - the max port number in the range that is matched by the security group rule (optional) - port\_range\_max - the min port number in the range that is matched by the security group rule (optional) - sec\_grp\_rule - the rule object to a security group rule object to associate (note: does not work currently) - remote\_ip\_prefix - the remote IP prefix to associate with this metering rule packet (optional) .. code:: python from snaps.openstack.create_security_group import SecurityGroupSettings, SecurityGroupRuleSettings, Direction, OpenStackSecurityGroup rule_settings = SubnetSettings(name='subnet-name', cidr='10.0.0.0/24') network_settings = NetworkSettings(name='network-name', subnet_settings=[subnet_settings]) sec_grp_name = 'sec-grp-name' rule_settings = SecurityGroupRuleSettings(name=sec_grp_name, direction=Direction.ingress) security_group_settings = SecurityGroupSettings(name=sec_grp_name, rule_settings=[rule_settings]) security_group_creator = OpenStackSecurityGroup(os_creds, security_group_settings) security_group_creator.create() # Perform logic ... # Cleanup security_group_creator.clean() Create Router ------------- - Router - snaps.openstack.create\_router.OpenStackRouter - snaps.openstack.create\_router.RouterSettings - name - the router name (required) - project\_name - the name of the project (optional - can only be set by admin users) - external\_gateway - the name of the external network (optional) - admin\_state\_up - flag to denote the administrative status of the router (default=True) - external\_fixed\_ips - dictionary containing the IP address parameters (parameter not tested) - internal\_subnets - list of subnet names to which this router will connect (optional) - port\_settings (list of optional snaps.openstack.create\_router.PortSettings objects) - creates custom ports to internal subnets (similar to internal\_subnets with more control) - name - network\_name - admin\_state\_up - project\_name - the name of the project (optional - can only be set by admin users) - mac\_address - ip\_addrs - fixed\_ips - security\_groups - allowed\_address\_pairs - opt\_value - opt\_name - device\_owner - device\_id .. code:: python from snaps.openstack.create_router import RouterSettings, OpenStackRouter router_settings = RouterSettings(name='router-name', external_gateway='external') router_creator = OpenStackRouter(os_creds, router_settings) router_creator.create() # Perform logic ... # Cleanup router_creator.clean() Create VM Instance ------------------ - VM Instances - snaps.openstack.create\_instance.OpenStackVmInstance - snaps.openstack.create\_instance.VmInstanceSettings - name - the name of the VM (required) - flavor - the name of the flavor (required) - port\_settings - list of snaps.openstack.create\_network.PortSettings objects where each denote a NIC (see above in create router section for details) API does not require, but newer NFVIs now require VMs have at least one network - security\_group\_names - a list of security group names to apply to VM - floating\_ip\_settings (list of snaps.openstack\_create\_instance.FloatingIpSettings objects) - name - a name to a floating IP for easy lookup  - port\_name - the name of the VM port on which the floating IP should be applied (required) - router\_name - the name of the router to the external network (required) - subnet\_name - the name of the subnet on which to attach the floating IP (optional) - provisioning - when true, this floating IP will be used for provisioning which will come into play once we are able to get multiple floating IPs working. - sudo\_user - overrides the image\_settings.image\_user value when attempting to connect via SSH - vm\_boot\_timeout - the number of seconds that the thread will block when querying the VM's status when building (default=900) - vm\_delete\_timeout - the number of seconds that the thread will block when querying the VM's status when deleting (default=300) - ssh\_connect\_timeout - the number of seconds that the thread will block when attempting to obtain an SSH connection (default=180) - availability\_zone - the name of the compute server on which to deploy the VM (optional must be admin) - userdata - the cloud-init script to execute after VM has been started - image\_settings - see snaps.openstack.create\_image.ImageSettings above (required) - keypair\_settings - see snaps.openstack.create\_keypairs.KeypairSettings above (optional) .. code:: python from snaps.openstack.create_instance import VmInstanceSettings, FloatingIpSettings, OpenStackVmInstance from snaps.openstack.create_network import PortSettings port_settings = PortSettings(name='port-name', network_name=network_settings.name) floating_ip_settings = FloatingIpSettings(name='fip1', port_name=port_settings.name, router_name=router_settings.name) instance_settings = VmInstanceSettings(name='vm-name', flavor='flavor_settings.name', port_settings=[port_settings], floating_ip_settings=[floating_ip_settings]) instance_creator = OpenStackVmInstance(os_creds, instance_settings, image_settings, kepair_settings) instance_creator.create() # Perform logic ... ssh_client = instance_creator.ssh_client() ... # Cleanup instance_creator.clean() Ansible Provisioning ==================== Being able to easily create OpenStack instances such as virtual networks and VMs is a good start to the problem of NFV; however, an NFVI is useless unless there is some software performing some function. This is why we added Ansible playbook support to SNAPS-OO which can be located in snaps.provisioning.ansible\_utils#apply\_playbook. See below for a description of that function's parameters: - playbook\_path - the file location of the ansible playbook - hosts\_inv - a list of hosts/IP addresses to which the playbook will be applied - host\_user - the user (preferably sudo) to use for applying the playbook - ssh\_priv\_key\_file\_path - the location to the private key file used for SSH - variables - a dict() of substitution values for Jinga2 templates leveraged by Ansible - proxy\_setting - used to extract the SSH proxy command (optional) Apply Ansible Playbook Utility ------------------------------ .. code:: python from snaps.provisioning import ansible_utils ansible_utils.apply_playbook('provisioning/tests/playbooks/simple_playbook.yml', [ip], user, priv_key, proxy_setting=self.os_creds.proxy_settings) OpenStack Utilities =================== For those who do like working procedurally, SNAPS-OO also leverages utilitarian functions for nearly every query or request made to OpenStack. This pattern will make it easier to deal with API version changes as they would all be made in one place. (see keystone\_utils for an example of this pattern as this is the only API where SNAPS is supporting more than one version) - snaps.openstack.utils.keystone\_utils - for calls to the Keystone APIs - snaps.openstack.utils.glance\_utils - for calls to the Glance APIs - snaps.openstack.utils.neutron\_utils - for calls to the Neutron APIs - snaps.openstack.utils.nova\_utils - for calls to the Nova APIs