Before beginning an upgrade to a new version of CSM, there are a few things to do on the system first.
[Preparation steps]
Warning: Management service resiliency is reduced during the upgrade.
Although it is expected that compute nodes and application nodes will continue to provide their services without interruption, it is important to be aware that the degree of management services resiliency is reduced during the upgrade. While one node is being upgraded, if another node of the same type has an unplanned fault that removes it from service, then this may result in a degraded system. For example, if there are three Kubernetes master nodes and one is being upgraded, the quorum is maintained by the remaining two nodes. If one of those two nodes has a fault before the third node completes its upgrade, then quorum would be lost.
(ncn-m001#) If a typescript session is already running in the shell, then first stop it with
the exit command.
(ncn-m001#) Start a typescript.
script -af /root/csm_upgrade.$(date +%Y%m%d_%H%M%S).prepare_for_upgrade.txt
export PS1='\u@\H \D{%Y-%m-%d} \t \w # '
If additional shells are opened during this procedure, then record those with typescripts as well. When resuming a procedure after a break, always be sure that a typescript is running before proceeding.
Before following the steps to prepare for the upgrade, make sure that the latest CSM documentation RPMs are
installed on any NCNs where preparation procedures are being performed. These should be for the CURRENT
CSM version on the system – not the target version of the upgrade.
See Check for latest documentation for instructions.
Warning: This process can take multiple hours where Nexus is unavailable and should be done during scheduled maintenance periods.
Prior to the upgrade it is recommended that a Nexus export is taken. This is not a required step but highly recommend to protect the data in Nexus. If there is no maintenance period available, then skip this step until after the upgrade process.
Reference Nexus Export and Restore Procedure for details.
While it is possible to upgrade with Kubernetes encryption enabled, disabling encryption is recommended for the duration of the upgrade if it has been enabled.
See Kubernetes Encryption for details.
Once the upgrade is complete, then encryption can be turned back on.
Boot Orchestration Service (BOS), Configuration Framework Service (CFS), Compute Rolling Upgrade Service (CRUS), Firmware Action Service (FAS), and Node Memory Dump (NMD) sessions should not be started or underway during the CSM upgrade process.
(ncn-m001#) Ensure that these services do not have any sessions in progress.
This System Admin Toolkit (SAT) command has
shutdownas one of the command line options, but it will not start a shutdown process on the system.
sat bootsys shutdown --stage session-checks
Example output:
Checking for active BOS sessions.
Found no active BOS sessions.
Checking for active CFS sessions.
Found no active CFS sessions.
Checking for active FAS actions.
Found no active FAS actions.
Checking for active NMD dumps.
Found no active NMD dumps.
No active sessions exist. It is safe to proceed with the shutdown procedure.
If active sessions are running, then either wait for them to complete, or shut down, cancel, or delete them.
Coordinate with the site to prevent new sessions from starting in these services.
There is currently no method to prevent new sessions from being created as long as the service APIs are accessible on the API gateway.
Validate CSM health.
Run the CSM health checks to ensure that everything is working properly before the upgrade starts. After the upgrade is completed, another health check is performed, and it is important to know if any problems observed at that time existed prior to the upgrade.
IMPORTANT: See the CSM Install Validation and Health Checks procedures in the
documentation for the CURRENT CSM version on the system. The validation procedures in the CSM
documentation are only intended to work with that specific version of CSM.
Validate Lustre health.
If a Lustre file system is being used, then see the ClusterStor documentation for details on how to validate Lustre health.
For any typescripts that were started during this preparation stage, stop them with the exit command.
After completing the above steps, proceed to Upgrade Management Nodes and CSM Services.