I’m trying to change max_connections and open_files_limit for MariaDB version 5.5.60 on CentOS 7.
Since there could be multiple my.cnf files, I used mysql --help --verbose to get possible locations. Here’s the output:
Default options are read from the following files in the given order: /etc/mysql/my.cnf /etc/my.cnf ~/.my.cnf
The /etc/mysql/my.cnf doesn’t exist and .my.cnf isn’t in my user directory, /root/ or mysql user’s directory (which doesn’t exist to begin with).
So I’m left with /etc/my.cnf. This is what it looks like:
[mysqld] datadir=/data/mysql socket=/var/lib/mysql/mysql.sock # Disabling symbolic-links is recommended to prevent assorted security risks symbolic-links=0 max_connections = 5000 open_files_limit = 10240 # Settings user and group are ignored when systemd is used. # If you need to run mysqld under a different user or group, # customize your systemd unit file for mariadb according to the # instructions in http://fedoraproject.org/wiki/Systemd [mysqld_safe] log-error=/var/log/mariadb/mariadb.log pid-file=/var/run/mariadb/mariadb.pid # # include all files from the config directory # !includedir /etc/my.cnf.d
The /etc/my.cnf.d from the last line contains server.cnf, which includes these two lines:
[server] max_connections=5000 open_files_limit=10240
However, when I run systemctl restart mariadb, only the max_connections is changed, but I just can’t get it to read the new value of open_files_limit.
It keeps doing this:
MariaDB [(none)]> SHOW VARIABLES LIKE 'open_files_limit'; +------------------+-------+ | Variable_name | Value | +------------------+-------+ | open_files_limit | 1024 | +------------------+-------+ 1 row in set (0.00 sec)
Do you have any idea why it’s doing this and how I could get the server to read the new value of open_files_limit?
Thank you in advance
Sasha
Answers:
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Method 1
The value of open_file_limits variable can’t be higher than your system limits.
Check output of ulimit -n and change your system configuration. Preferable assign these limits not system wide, but for the user under which MariaDB server is running.
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