Downgrading etcd clusters and applications

Mon, 01 Jan 0001 00:00:00 +0000

This section contains documents specific to downgrading etcd clusters and applications.

Downgrading an etcd v3.x cluster

Mon, 01 Jan 0001 00:00:00 +0000

In the general case, downgrading from etcd 3.5 to 3.4 can be a zero-downtime, rolling downgrade:

one by one, stop the etcd 3.5 processes and replace them with etcd 3.4 processes
after starting any 3.4 processes, new features in 3.5 are not longer available to the cluster

Before starting a downgrade, read through the rest of this guide to prepare.

content/en/docs/v3.5/op-guide/authentication/rbac.md

NOTE: If your cluster enables auth, rolling downgrade from 3.5 isn’t supported because 3.5 changes a format of WAL entries related to auth. You can follow the authentification instructions to disable auth, and delete all users first.