maria-discuss team mailing list archive

[Guillaume Lefranc <guillaume@xxxxxxxxxxxx>]

Hi,

Since you are using LXC, you have to pass an option to change the limit.

For docker:

docker run --name mariadb --ulimit nofile=65535:65535 mariadb:10.1.35

In LXC:

lxc config set mariadb limits.kernel.nofile 65535

-GL


Le ven. 2 nov. 2018 à 12:07, <c.monty@xxxxxx> a écrit :

> Hi,
> I have installed
> MariaDB 10.1.35
> in a container (LXC) with Debian 9.5.
>
> Starting the database service I get this warning:
> Nov 02 03:23:50 ct125-netdot mysqld[25687]: 2018-11-02  3:23:50
> 140396535071680 [Warning] Could not increase number of max_open_files to
> more than 4096 (request: 4182)
>
> MariaDB [(none)]> SHOW GLOBAL VARIABLES LIKE 'open_files_limit';
> +------------------+-------+
> | Variable_name    | Value |
> +------------------+-------+
> | open_files_limit | 4096  |
> +------------------+-------+
> 1 row in set (0.00 sec)
>
>
> Checking MariaDB documentation "Server System Variables" here (
> https://mariadb.com/kb/en/library/server-system-variables/#open_files_limit)
> I get this info:
> open_files_limit
>
>    - *Description:* The number of file descriptors available to mysqld.
>    Increase if you are getting the Too many open files error. If set to
>    0, then mysqld will reserve max_connections
>    <https://mariadb.com/kb/en/library/server-system-variables/#max_connections>*5
>    or max_connections
>    <https://mariadb.com/kb/en/library/server-system-variables/#max_connections>
>     + table_open_cache
>    <https://mariadb.com/kb/en/library/server-system-variables/#table_open_cache>*2
>    (whichever is larger) number of files. Note that MariaDB cannot set this to
>    exceed the hard limit imposed by the operating system, and you may need to
>    change this. For example, by adding the following lines to
>    /etc/security/limits.conf
>
> mysql soft nofile 65535
> mysql hard nofile 65535
>
> rebooting, and then create
> /etc/systemd/system/mysqld.service.d/filelimit.conf or
> /etc/systemd/system/mariadb.service.d/filelimit.conf (corresponding to
> the service name).
>
> [Service]
> LimitNOFILE=infinity
>
>
> I have modified file /etc/security/limits.conf accordingly:
> mysql           soft    nofile          4182
> mysql           hard    nofile          4182
>
> And I have create file
> /etc/systemd/system/mariadb.service.d/filelimit.conf:
> root@ct125-netdot:~# more
> /etc/systemd/system/mariadb.service.d/filelimit.conf
> [Service]
> LimitNOFILE=4182
>
> Why is MariaDB writing this warning?
>
> THX
>
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