Mysql 5.6, CentOS 7 And Errno: 24 – Too Many Open Files

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Hi,

may be somewon has a working solution and information on that:

I installed the most recent mysql community on a server and do get a lot of “errno: 24 – Too many open files”.

There are suggestions to increase the open_files_limit, change/add that to /etc/security/limits.conf and modify the systemd script by hand.

Depending on how you start mysql (restart, or at systemboot time …)
the limit get set or not.

Question: Is that may be a known bug or something?

And thats mit a question regarding mariadb or mysql.

Regards . Götz

8 thoughts on - Mysql 5.6, CentOS 7 And Errno: 24 – Too Many Open Files

  • Gotz,

    This is due to systemd, it overrules your settings. Add a file to systemd config fixes it:

    [root@mysql2 ~]# cat /etc/systemd/system/mariadb.service.d/limits.conf
    [Service]
    LimitNOFILE=10000
    LimitMEMLOCK=10000


    Met vriendelijke groeten / With kind regards, Johan Kooijman

  • Carl,

    By default my.cnf has to obey the OS limits, so in this case the order is:
    systemd > /etc/security/limits* > /etc/my*.


    Met vriendelijke groeten / With kind regards, Johan Kooijman

  • Hi,

    as that example is for maria db, teh oracle mysql rpm dose not ship with something like

    /etc/systemd/system/mysqld.service.d

    Can I just create /etc/systemd/system/mysqld.service.d/limits.conf and than I’m ready to go?

    Thanks for your patience and regards . Götz

    Am 29.04.15 um 14:58 schrieb Johan Kooijman:

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