This guide explains how to best upgrade a multi-datacenter Consul deployment that is using
a version of Consul >= 1.6.9 and < 1.8.13 while maintaining replication. If you are on a version
older than 1.6.9, please follow the link for the version you are on from here.
In this guide, we will be using an example with two datacenters (DCs) and will be
referring to them as DC1 and DC2. DC1 will be the primary datacenter.
You have at least two datacenters configured and have ACL replication enabled. If you are
not using multiple datacenters, you can follow along and simply skip the instructions related
to replication.
There are not too many major changes that might cause issues upgrading from 1.6.9, but notable changes
are called out in our Specific Version Details
page. You can find more granular details in the full changelog.
Looking through these changes prior to upgrading is highly recommended.
The primary datacenter (indicated by primary_datacenter) will always show as having replication
disabled, so this is normal even if replication is happening.
2. Check replication status in DC2 by issuing the following curl command from a
consul server in that DC:
