Adding developer/troubleshooting section to Installation Instructions

    Updating with suggestions and comments

Change-Id: Ida7357eba0b2ed5d59f89b91603c8149a6fbcf7a
Signed-off-by: Ricardo Noriega <rnoriega@redhat.com>

1 files changed, 144 insertions, 0 deletions

diff --git a/docs/installationprocedure/troubleshooting.rst b/docs/installationprocedure/troubleshooting.rst
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+Developer Guide and Troubleshooting
+===================================
+
+This section aims to explain in more detail the steps that Apex follows
+to make a deployment. It also tries to explain possible issues you might find
+in the process of building or deploying an environment.
+
+After installing the Apex RPMs in the jumphost, some files will be located
+around the system.
+
+1.  /etc/opnfv-apex: this directory contains a bunch of scenarios to be
+    deployed with different characteristics such HA (High Availability), SDN
+    controller integration (OpenDaylight/ONOS), BGPVPN, FDIO, etc. Having a
+    look at any of these files will give you an idea of how to make a
+    customized scenario setting up different flags.
+
+2.  /usr/bin/: it contains the binaries for the commands opnfv-deploy,
+    opnfv-clean and opnfv-util.
+
+3.  /var/opt/opnfv/: it contains several files and directories.
+
+   3.1.   images/: this folder contains the images that will be deployed
+   according to the chosen scenario.
+
+   3.2.   lib/: bunch of scripts that will be executed in the different phases
+   of deployment.
+
+
+Utilization of Images
+---------------------
+
+As mentioned earlier in this guide, the Undercloud VM will be in charge of
+deploying OPNFV (Overcloud VMs). Since the Undercloud is an all-in-one
+OpenStack deployment, it will use Glance to manage the images that will be
+deployed as the Overcloud.
+
+So whatever customization that is done to the images located in the jumpserver
+(/var/opt/opnfv/images) will be uploaded to the undercloud and consequently, to
+the overcloud.
+
+Make sure, the customization is performed on the right image. For example, if I
+virt-customize the following image overcloud-full-opendaylight.qcow2, but then
+I deploy OPNFV with the following command:
+
+        ``sudo opnfv-deploy -n network_settings.yaml -d
+        /etc/opnfv-apex/os-onos-nofeature-ha.yaml``
+
+It will not have any effect over the deployment, since the customized image is
+the opendaylight one, and the scenario indicates that the image to be deployed
+is the overcloud-full-onos.qcow2.
+
+
+Post-deployment Configuration
+-----------------------------
+
+Post-deployment scripts will perform some configuration tasks such ssh-key
+injection, network configuration, NATing, OpenVswitch creation. It will take
+care of some OpenStack tasks such creation of endpoints, external networks,
+users, projects, etc.
+
+If any of these steps fail, the execution will be interrupted. In some cases,
+the interruption occurs at very early stages, so a new deployment must be
+executed. However, some other cases it could be worth it to try to debug it.
+
+        1.  There is not external connectivity from the overcloud nodes:
+
+                Post-deployment scripts will configure the routing, nameservers
+                and a bunch of other things between the overcloud and the
+                undercloud. If local connectivity, like pinging between the
+                different nodes, is working fine, script must have failed when
+                configuring the NAT via iptables. The main rules to enable
+                external connectivity would look like these:
+
+                ``iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE``
+                ``iptables -t nat -A POSTROUTING -s ${external_cidr} -o eth0 -j
+                MASQUERADE``
+                ``iptables -A FORWARD -i eth2 -j ACCEPT``
+                ``iptables -A FORWARD -s ${external_cidr} -m state --state
+                ESTABLISHED,RELATED -j ACCEPT``
+                ``service iptables save``
+
+                These rules must be executed as root (or sudo) in the
+                undercloud machine.
+
+OpenDaylight Integration
+------------------------
+
+When a user deploys any of the following scenarios:
+
+        - os-odl_l2-bgpvpn-ha.yaml
+        - os-odl_l2-fdio-ha.yaml
+        - os-odl_l2-fdio-noha.yaml
+        - os-odl_l2-nofeature-ha.yaml
+        - os-odl_l2-sfc-noha.yaml
+        - os-odl_l3-nofeature-ha.yaml
+
+OpenDaylight (ODL) SDN controller will be deployed too and completely
+integrated with OpenStack. ODL is running as a systemd service, so you can
+manage it as a regular service:
+
+        ``systemctl start/restart/stop opendaylight.service``
+
+This command must be executed as root in the controller node of the overcloud,
+where OpenDaylight is running. ODL files are located in /opt/opendaylight. ODL
+uses karaf as a Java container management system that allows the users to
+install new features, check logs and configure a lot of things. In order to
+connect to Karaf's console, use the following command:
+
+        ``opnfv-util opendaylight``
+
+This command is very easy to use, but in case it is not connecting to Karaf,
+this is the command that is executing underneath:
+
+        ``ssh -p 8101 -o UserKnownHostsFile=/dev/null -o
+        StrictHostKeyChecking=no karaf@localhost``
+
+Of course, localhost when the command is executed in the overcloud controller,
+but you use its public IP to connect from elsewhere.
+
+Debugging Failures
+------------------
+
+This section will try to gather different type of failures, the root cause and
+some possible solutions or workarounds to get the process continued.
+
+1.  I can see in the output log a post-deployment error messages:
+
+        Heat resources will apply puppet manifests during this phase. If one of
+        these processes fail, you could try to see the error and after that,
+        re-run puppet to apply that manifest. Log into the controller (see
+        verification section for that) and check as root /var/log/messages.
+        Search for the error you have encountered and see if you can fix it. In
+        order to re-run the puppet manifest, search for "puppet apply" in that
+        same log. You will have to run the last "puppet apply" before the
+        error. And It should look like this:
+
+                ``FACTER_heat_outputs_path="/var/run/heat-config/heat-config-puppet/5b4c7a01-0d63-4a71-81e9-d5ee6f0a1f2f"  FACTER_fqdn="overcloud-controller-0.localdomain.com" \
+                FACTER_deploy_config_name="ControllerOvercloudServicesDeployment_Step4"  puppet apply --detailed-exitcodes -l syslog -l console \
+                /var/lib/heat-config/heat-config-puppet/5b4c7a01-0d63-4a71-81e9-d5ee6f0a1f2f.pp``
+
+        As a comment, Heat will trigger the puppet run via os-apply-config and
+        it will pass a different value for step each time. There is a total of
+        five steps. Some of these steps will not be executed depending on the
+        type of scenario that is being deployed.