Use the container image pre-cache feature

Single-node OpenShift clusters might have limited bandwidth to access the container image registry, which can cause a timeout before the updates are completed.

Note

The time of the update is not set by TALM. You can apply the ClusterGroupUpgrade CR at the beginning of the update by manual application or by external automation.

The container image pre-caching starts when the preCaching field is set to true in the ClusterGroupUpgrade CR.

TALM uses the PrecacheSpecValid condition to report status information as follows:

  • true

    The pre-caching spec is valid and consistent.

  • false

    The pre-caching spec is incomplete.

TALM uses the PrecachingSucceeded condition to report status information as follows:

  • true

    TALM has concluded the pre-caching process. If pre-caching fails for any cluster, the update fails for that cluster but proceeds for all other clusters. A message informs you if pre-caching has failed for any clusters.

  • false

    Pre-caching is still in progress for one or more clusters or has failed for all clusters.

After a successful pre-caching process, you can start remediating policies. The remediation actions start when the enable field is set to true. If there is a pre-caching failure on a cluster, the upgrade fails for that cluster. The upgrade process continues for all other clusters that have a successful pre-cache.

The pre-caching process can be in the following statuses:

  • NotStarted

    This is the initial state all clusters are automatically assigned to on the first reconciliation pass of the ClusterGroupUpgrade CR. In this state, TALM deletes any pre-caching namespace and hub view resources of spoke clusters that remain from previous incomplete updates. TALM then creates a new ManagedClusterView resource for the spoke pre-caching namespace to verify its deletion in the PrecachePreparing state.

  • PreparingToStart

    Cleaning up any remaining resources from previous incomplete updates is in progress.

  • Starting

    Pre-caching job prerequisites and the job are created.

  • Active

    The job is in "Active" state.

  • Succeeded

    The pre-cache job succeeded.

  • PrecacheTimeout

    The artifact pre-caching is partially done.

  • UnrecoverableError

    The job ends with a non-zero exit code.

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