my.cnf

my.ini changes are global to all projects, but will only affect the currently selected MySQL version.

Important

When using howto_docker_toolbox_and_the_devilbox on Windows, *.cnf files must have read-only file permissions, otherwise they are not sourced by the MySQL server.

Make sure to chmod 0444 *.cnf after adding your values.

Table of Contents

local

General

You can set custom MySQL options via your own defined my.cnf files for each version separately. See the directory structure for MySQL configuration directories inside ./cfg/ directory:

host> ls -l path/to/devilbox/cfg/ | grep -E 'mysql|mariadb|percona'

drwxr-xr-x  2 cytopia cytopia 4096 Mar  5 21:53 mariadb-10.0/
drwxr-xr-x  2 cytopia cytopia 4096 Mar  5 21:53 mariadb-10.1/
drwxr-xr-x  2 cytopia cytopia 4096 Mar  5 21:53 mariadb-10.2/
drwxr-xr-x  2 cytopia cytopia 4096 Mar  5 21:53 mariadb-10.3/
drwxr-xr-x  2 cytopia cytopia 4096 Mar  5 21:53 mysql-5.5/
drwxr-xr-x  2 cytopia cytopia 4096 Mar  5 21:53 mysql-5.6/
drwxr-xr-x  2 cytopia cytopia 4096 Mar  5 21:53 mysql-5.7/
drwxr-xr-x  2 cytopia cytopia 4096 Mar  5 21:53 mysql-8.0/
drwxr-xr-x  2 cytopia cytopia 4096 Mar  5 21:53 percona-5.5/
drwxr-xr-x  2 cytopia cytopia 4096 Mar  5 21:53 percona-5.6/
drwxr-xr-x  2 cytopia cytopia 4096 Mar  5 21:53 percona-5.7/

Customization is achieved by placing a file into cfg/mysql-X.X/, cfg/mariadb-X.X/ or cfg/percona-X-X (where X.X stands for your MySQL version). The file must end by .cnf in order to be sourced by the MySQL server.

Each of the MySQL cnf configuration directories already contain an example file: devilbox-custom.cnf-example, that can simply be renamed to devilbox-custom.cnf. This file holds some example values that can be adjusted or commented out.

In order for the changes to be applied, you will have to restart the Devilbox.

Examples

Change key_buffer_size for MySQL 5.5

The following examples shows you how to change the key_buffer_size of MySQL 5.5 to 16 MB.

# Navigate to the Devilbox directory
host> cd path/to/devilbox

# Navigate to MySQL 5.5 config directory
host> cd cfg/mysql-5.5

# Create new cnf file
host> touch key_buffer_size.cnf

Now add the following content to the file:

[mysqld]
key_buffer_size=16M

In order to apply the changes you need to restart the Devilbox. You can validate that the changes have taken place by visiting the Devilbox intranet MySQL info page.

Change timeout and packet size for PerconaDB 5.7

The following examples shows you how to change the wait_timeout and max_allowed_packet of PerconaDB 5.7

# Navigate to the Devilbox directory
host> cd path/to/devilbox

# Navigate to PerconaDB 5.7 config directory
host> cd cfg/percona-5.7

# Create new ini file
host> touch timeouts.cnf