How to create and restore local MySQL or MariaDB backups

Estimated reading time: 1 min

Introduction

This article will help you create and restore local MySQL or MariaDB backups of all your databases. We will utilize cron to schedule the backups.

Prerequisites

This requires a /root/.my.cnf file which contains credentials so the user root can log in to the MySQL / MariaDB server with sufficient privileges without entering a password. Example /root/.my.cnf contents:

[client]
user=root
password=mysecretpassword

Don’t forget to change the permissions:

sudo chmod 600 /root/.my.cnf

Test if it works with:

PING=$(sudo mysqladmin ping 2>/dev/null)
if [ "$PING" != "mysqld is alive" ]; then
  clear && echo 'Error: Unable to connect to MySQL Server!'
else
  clear && echo 'Successfully connected to the MySQL server!'
fi

Install script

sudo wget -O /usr/local/sbin/backup_mysql.sh https://git.snel.com/snelcom/backup-mysql/raw/branch/master/backup_mysql.sh
sudo chmod 700 /usr/local/sbin/backup_mysql.sh

Install cronjob

This will add a cronjob to root which will run this script daily at 0:10 am. Adjust as necessary.

(sudo crontab -l 2>/dev/null; sudo echo '10 0 * * * test -x /usr/local/sbin/backup_mysql.sh && /usr/local/sbin/backup_mysql.sh') | sudo crontab -

Recover database

Assuming you want to restore mytestdb from your backups made on 20190121-1540:

DB='mytestdb'
BACKUPDIR='/var/backup/mysql/20190121-1540'
sudo mysql -e "CREATE DATABASE IF NOT EXISTS ${DB}"
sudo -i bash -c 'for table in ${BACKUPDIR}/${DB}/*; do gunzip -c $table | mysql ${DB}; done'

Conclusion

Your daily plain-text MySQL or MariaDB backups will be stored in /var/backup/mysql. This will help greatly when you need to recover a single table, a single database or all databases.

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