Symptoms
-
E-Mails are stuck in the queue with below messages in
/var/log/maillog:amavis[26892]: (26892-01) (!)connect_to_sql: unable to connect to DSN 'DBI:mysql:database=emailsecurity;host=localhost;port=3306': Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (13)
amavis[26892]: (26892-01) (!!)TROUBLE in process_request: connect_to_sql: unable to connect to any dataset at (eval 132) line 253.
amavis[26892]: (26892-01) (!)Requesting process rundown after fatal error -
MariaDB upgrade has been performed recently on the server with SELinux enabled
Cause
MariaDB bug #MDEV-24941: SElinux incorrect label for server socket.
The SELinux context for the MariaDB socket file /var/lib/mysql/mysql.sock has been lost because of an upgrade to MariaDB version affected by the bug.
Resolution
To workaround the problem until the bug is resolved apply the following steps:
- Connect to the server via SSH
Warning: On applying the following step the database server MariaDB will be restarted, which leads to a short inaccessibility of other Plesk related services and websites accessing the database
-
Run the following command:
# printf '%sn' '[Service]' 'ExecStartPost=/sbin/restorecon /var/lib/mysql/mysql.sock' > /etc/systemd/system/mariadb.service.d/restorecon_socket.conf && systemctl daemon-reload && systemctl restart mariadb