Planning for the procedure

Background knowledge

This procedure assumes that:

  • you are installing into an existing OpenStack deployment

    • The OpenStack deployment must be set up with support for Heat templates.

  • you are using an OpenStack version from Icehouse through to Train inclusive

  • you are thoroughly familiar with working with OpenStack machines and know how to set up tenants, users, roles, client environment scripts, and so on.
    (For more information, refer to the appropriate OpenStack installation guide for the version that you are using here.)

  • you are upgrading an existing downlevel deployment for SGC.

  • you have deployed a SIMPL VM, and have followed all the pre-upgrade steps.

Reserve maintenance period

This procedure requires a maintenance period. When integrating into a live network, we recommend that you implement measures to mitigate any unforeseen events.

Plan for service impact

Misconfiguration could disrupt services for existing network elements.

People

You must be a system operator to perform the MOP steps.

Tools and access

You must have access to the SIMPL VM, and the SIMPL VM must have the right permissions on the OpenStack deployment.

Method of procedure

Note Refer to the SIMPL VM Documentation for details on the commands mentioned in the procedure.

Step 1 - Upgrade the downlevel SGC VMs

Run csar update --vnf sgc --sdf <path to SDF>.

Note To perform a canary upgrade, run csar update --vnf sgc --sites <site> --service-group <service_group> --index-range <range> --sdf <path to SDF>. The indexes start from 0, therefore 0 is the first VM. The range accepts ranges as well as comma separated indexes (e.g. 1-3,7,9). Only the nodes specified in the index will be upgraded.

This will validate the uplevel SDF, generate the uplevel Terraform template, upload the uplevel image, and then it will start the upgrade.

The following will occur one SGC node at a time:

  • The downlevel node will be quiesced.

  • The uplevel node will be created and boot up.

  • The VM will automatically start applying configuration from the files you uploaded to CDS in the above steps. During this phase, the status of the VM in MDM will be Orange.

  • Once configuration is complete, the status will change to Green, and the node will be ready for service. At this point the csar update command will move on to the next SGC VM, or report that the upgrade of the SGC was successful if all nodes have now been upgraded.

  • Once the upgrade is complete, place calls and run any additional validation tests to verify the uplevel VMs are working as expected.

Backout procedure

If the upgrade has brought up uplevel VMs to replace the downlevel VMs, then the uplevel VMs can be rolled back to the downlevel VMs. To rollback, repeat the steps above with the downlevel SGC CSAR and downlevel SDF.

You may need to use the --skip pre-update-checks flag as part of the csar update command. The --skip pre-update-checks flag allows rollbacks when a node is unhealthy.

If the upgrade has failed to bring up the uplevel VMs or the rollback has failed to bring up the downlevel VMs, then you must redeploy the downlevel VMs. run csar redeploy --vnf sgc --sites <site> --sdf <path to SDF>.

Diagnostics during the quiesce stage

When the downlevel VMs are quiesced, they upload some diagnostics to the CDS. These may be useful if the upgrade or rollback fails.

To get these diagnostics, follow instructions from Retrieving deployment TAS audit logs with export-audit-history and Retrieving Initconf and SGC logs with export-log-history.

Next Step

Follow the post upgrade instructions here: Post rolling upgrade steps

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