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La socket /var/lib/mysql/mysql.sock n'est disponible que si le démon est démarré et opérationnel.
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cat /usr/share/doc/mariadb/README.urpmi

NOTE: MariaDB is installed without root password, it is recommended to set the
root password with the following command as soon as possible:

# mysql_secure_installation
press enter at each question except the new root password.

The initscript used to start mysql has been reverted to use the one shipped
by MariaDB. This means the following changes:

* The generation of the initial system mysql database is now done when mysql
is started from the initscript and only if the /var/lib/mysql/mysql
directory is empty (mysql_install_db). Previousely this was quite hidden and
silently done at (rpm) install time. As a consequence to this change you may
have to perform some manual tasks to upgrade the mysql system database and
such. So, doing something like this might help you:

systemctl stop mysqld.service
TMPDIR=/var/tmp mysql_install_db
mysql_upgrade --skip-write-binlog

The cluster functionalities (ndb) has been deactivated and will be removed in
future mysql versions. Oracle has a new product named mysql-cluster that
replaces the cluster functionalities.

The mysql-common-core package ships with a default /etc/my.cnf file that is
based on the my-medium.cnf file that comes with the source code.

If you need time zone data, run the following command after install:
mysql_tzinfo_to_sql /usr/share/zoneinfo | mysql -D mysql

$cfg['Servers'][$i]['socket']
Type: string
Default value: ''

The path to the socket to use. Leave blank for default. To determine the correct socket, check your MySQL configuration or, using the mysql command–line client, issue the status command. Among the resulting information displayed will be the socket used.

Note

This takes effect only if $cfg['Servers'][$i]['host'] is set to localhost.