the following may be useful for most server systems OOM-killer acts if some process reclaims more and more memory and the kernel randomly kills unimportant tasks using hughe memory
in case of a running mysqld the classification "unimportant" is nearly all time wrong and can cause hughe damage and work in other words: you really never want killed a database server randomly instead "dbmail-imapd" which can be restarted via systemd without pain and may be the root-cause of OOM _________________________________________ with one single command you can protect processes from get killed i started to run this every 15 minutes to make sure it is also active after restarts i am considering include this in "mysqld.service" as "ExecStartPost=-/usr/local/bin/mysql-no-oom.sh" in our internal mysqld-packages and include also the script _________________________________________ [root@mail:~]$ cat /etc/crontab | grep oom 0,15,30,45 * * * * root bash /usr/local/bin/mysql-no-oom.sh [root@mail:~]$ cat /usr/local/bin/mysql-no-oom.sh #!/bin/bash pgrep -f "/usr/libexec/mysqld" | while read PID; do echo -1000 > /proc/$PID/oom_score_adj; done
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