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 Aria Automation / Orchestrator manual (CLI) cluster upgrade from earlier versions to 8.14.x+ may fail due to SSH configuration

https://knowledge.broadcom.com/external/article?articleNumber=315177


Products

VMware Aria Suite

Issue/Introduction

Symptoms:

  • The node which executes the upgrade may become split from the cluster
  • In the upgrade log, you may see warnings related to host keys:
    • @  WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!   @
    • IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
    • Someone could be eavesdropping on you right now (man-in-the-middle attack)!
    • It is also possible that a host key has just been changed.

 

Environment

  • Aria Automation 8.x

Cause

  • It may be due to non-standard sshd_config (_effective) or it may be more widely seen if KB 326133 is not applied before manual upgrades.
  • More testing is needed to decide that.

Resolution

This is a less common issue than KB 326063.

  1. Ensure System health is good for upgrade
  2. Apply KB 326063 if these files exist
  3. Apply also KB 326133

 

  • The key step from that KB are to enforce certain algorithms in /etc/ssh/sshd_config_effective (or sshd_config on older versions)
  • These are given as values to the options MACs and KexAlgorithms in that file.

 

Additional Information

Impact/Risks:

  • No impact. These are recommended changes.


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