Helix Core Server Administrator Guide: Multi-Site Deployment (2019.1)

Upgrading services

Servers, brokers, and proxies must be at the same release level. When upgrading:

  1. Shut down the furthest-upstream service or commit server and permit the system to quiesce.
  2. Upgrade downstream services first, starting with the replica that is furthest downstream, working upstream towards the master or commit server.
  3. Keep downstream services stopped until the server immediately upstream has been upgraded.
Tip

Upgrading to 2019.1 (and later) is different from previous upgrade. See Upgrading the server > From 2013.3 or later to 2019.1 (distributed environment) in Helix Core Server Administrator Guide: Fundamentals.