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upgrade_guide.md

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Upgrade Guide

This document shows how to safely upgrade the operator to a desired version while preserving the cluster's state and data whenever possible. It is assumed that the preexisting cluster is configured to create and store backups to persistent storage. See the backup config guide for details.

Backup safety precaution:

First create a backup of your current cluster before starting the upgrade process. See the backup service guide on how to create a backup.

In the case of an upgrade failure you can restore your cluster to the previous state from the previous backup. See the spec examples on how to do that.

Upgrade operator deployment

An in-place update can be performed when the upgrade is compatible, i.e we can upgrade the operator without affecting the cluster.

To upgrade an operator deployment the image field spec.template.spec.containers.image needs to be changed via an in-place update.

Change the image field to quay.io/coreos/etcd-operator:vX.Y.Z where vX.Y.Z is the desired version.

$ kubectl edit deployment/etcd-operator
# make the image change in your editor then save and close the file

Incompatible upgrade

In the case of an incompatible upgrade, the process requires restoring a new cluster from backup. See the incompatible upgrade guide for more information.

v0.2.x -> v0.3.x

Prerequisite:

To upgrade to v0.3.x the current operator verison must first be upgraded to v0.2.6+, since versions < v0.2.6 are not compatible with v0.3.x .

Noticeable changes:

  • Spec.Backup.MaxBackups update:
    • If you have Spec.Backup.MaxBackups < 0, previously it had no effect. Now it will get rejected. Please remove it.
    • If you have Spec.Backup.MaxBackups == 0, previously it had no effect. Now it will create backup sidecar that allows unlimited backups. If you don't want backup sidecar, just don't set any backup policy.