ERROR WHILE RUNNING MARIADB
it fails because the MariaDB server (mariadbd) is not able to start properly.
Common causes are:
1.Corrupt or missing data directory
2.Port/socket conflicts
3.Permission issues
4.Bad configuration file
TO DIAGNOSE
#Check service status
sudo systemctl status mariadb --no-pager -l
#Check MariaDB error logs
sudo journalctl -xeu mariadb --no-pager | tail -n 50
#Fixes depending on the problem
#Old process/socket blocking
sudo killall -9 mysqld mariadbd
sudo rm -f /run/mysqld/mysqld.sock
sudo systemctl start mariadb
#Wrong permissions
#If logs say "Permission denied" for /var/lib/mysql or /run/mysqld:
sudo chown -R mysql:mysql /var/lib/mysql
sudo chown -R mysql:mysql /run/mysqld
sudo systemctl restart mariadb
#Case 3: Corrupted/missing data
#If logs say "InnoDB corruption" or "cannot find mysql.user table", reinitialize:
sudo systemctl stop mariadb
sudo mv /var/lib/mysql /var/lib/mysql.bak # backup
sudo mariadb-install-db --user=mysql --basedir=/usr --datadir=/var/lib/mysql
sudo systemctl start mariadb
Config error
#If logs mention /etc/mysql/mariadb.conf.d/50-server.cnf, edit it:
sudo nano /etc/mysql/mariadb.conf.d/50-server.cnf
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