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Who’s afraid of OOM killer

Posted on April 2nd, 2008 in dovhcajt |

Debian still has this annoying feature, that service init script gets symlinked if you upgrade package, so disabling it manually via update-rc.d is still not enough. Trying to solve this and make sshd not run on my laptop with a hack by putting a line like ‘exit 1′ in /etc/default/ssh does settle this. However, I was a bit suprised to see a variable SSHD_OOM_ADJUST, meaning OOM kill priority can be adjusted or even disabled.

Corresponding excerpt from kernel documentation (proc.txt):

2.12 /proc/<pid>/oom_adj – Adjust the oom-killer score
——————————————————
This file can be used to adjust the score used to select which processes
should be killed in an out-of-memory situation. Giving it a high score will
increase the likelihood of this process being killed by the oom-killer. Valid
values are in the range -16 to +15, plus the special value -17, which disables
oom-killing altogether for this process.

This means it shouldn’t happen that your sshd gets shot by OOM killer on Debian … when lenny gets out.

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