Add replication example to upgrade docs (#12040)
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@ -114,3 +114,20 @@ Upgrading installations of Vault which participate in [Enterprise Replication](/
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- Verify functionality of each secondary instance after upgrading
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- When satisfied with functionality of upgraded secondary instances, upgrade
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the primary instance
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Upgrades of multiple replicated clusters can be complicated. Here is an
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example.
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![Upgrading multiple replicated clusters](/img/vault-replication-upgrade.png)
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In the above scenario, the ideal upgrade procedure would be as follows,
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verifying functionality after each cluster upgrade.
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1. Upgrade Clusters B and D, using the HA upgrade process above. These clusters
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have no downstream clusters, so they should be upgraded first, but the
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ordering of B vs D does not matter.
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2. Upgrade Cluster C, which now has an upgraded downstream cluster (Cluster D).
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Because Cluster C is a cluster, it should also use the HA upgrade process.
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3. Finally, upgrade Cluster A. All clusters downstream of A will already be
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upgraded. It should be upgraded last, as it is a Performance Primary and a DR
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Primary.
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