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Re: I keep finding postfix down

On 06/03/25 Martin Hicks via linux said:

> Any chance that the kernel OOM handler is swooping in to save you?

Possible. I usually see that in the logs. 

The vps has little resources

msoulier@nicodemus:~$ free -m
               total        used        free      shared  buff/cache   available
Mem:             457         174         117           3         179         282
Swap:           1023         222         801

Oh look at that.

kern.log:2025-03-06T03:43:55.631747+00:00 nicodemus kernel: [549916.988900] systemd-journal invoked oom-killer: gfp_mask=0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), order=0, oom_score_adj=-250

kern.log:2025-03-06T03:44:00.631168+00:00 nicodemus kernel: [549917.668001] systemd invoked oom-killer: gfp_mask=0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), order=0, oom_score_adj=0

kern.log:2025-03-06T03:53:22.312779+00:00 nicodemus kernel: [550484.460616] do-agent invoked oom-killer: gfp_mask=0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), order=0, oom_score_adj=-900

kern.log:2025-03-06T03:53:22.583143+00:00 nicodemus kernel: [550484.465167] containerd invoked oom-killer: gfp_mask=0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), order=0, oom_score_adj=-999

kern.log:2025-03-06T04:10:29.603663+00:00 nicodemus kernel: [551511.300658] do-agent invoked oom-killer: gfp_mask=0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), order=0, oom_score_adj=-900

kern.log:2025-03-06T04:23:31.416498+00:00 nicodemus kernel: [552293.566993] dpkg-query invoked oom-killer: gfp_mask=0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), order=0, oom_score_adj=0

and more, and more

Looks like resources are so tight that it's coming up a lot. 

Guess I should pay for more or find a way to run leaner. Maybe DigitalOcean's
defaults are just too small.

Mike

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