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Perform a Rolling Upgrade

This guide walks through upgrading every node in a running Ella Core high-availability cluster, one at a time, without taking the cluster offline.

Prerequisites

Upgrade one node

Repeat these steps for each node.

  1. Open the Cluster page on any healthy node other than the one you are about to upgrade.
  2. Click Drain next to the node you want to upgrade. Wait until its Drain State is drained.

  3. On that host, refresh the snap:

    sudo snap refresh ella-core

  4. On the Cluster page, wait for the node to return to Healthy.

  5. Click Resume next to the node. Wait for Drain State to clear back to active.
  6. Move to the next node.

Verify the upgrade

After every node has been refreshed, open the Cluster page and confirm:

  • Every node's Version column shows the target release.
  • Every node is Healthy and its Drain State is active.
  • Schema shows a single version.