[Qlustar General] ssh server and oom_score_adj

Hi,

Recently I found that our login nodes are abused with users running heavy nodejs sessions (from visual studio code). I setup some memory limits for users and OOM is coming, but cannot kill users processes, because all of them are with oom_score_adj=-1000. It is coming from parent sshd server also with oom_score_adj=-1000.

As a workaround I'm stopping traditional ssh server and starting ssh.socket at boot (via rc.boot script). Now oom_score_adj=0 as it should be. That is also important for computing nodes with ssh connection enabled.

Regards Rolandas

P.S. We are still on Qlustar 13, so I don't know situation on Qlustar 14, but it could be different because ssh connection in Ubuntu 24.04 LTS is activated via ssh socket already.