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, 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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