#!/bin/sh
## backup each mysql db into a different file, rather than one big file
## as with --all-databases. This will make restores easier.
## To backup a single database simply add the db name as a parameter (or multiple dbs)

## Putting the script in /var/backups/mysql seems sensible... on a debian machine that is
## Create the user and directories
# mkdir -p /var/backups/mysql/databases
# useradd --home-dir /var/backups/mysql --gid backup --no-create-home mysql-backup
## Remember to make the script executable, and unreadable by others
# chown -R mysql-backup:backup /var/backups/mysql
# chmod u=rwx,g=rx,o= /var/backups/mysql/dump.sh

## crontab entry - backup every night at 02:00
# sudo -u mysql-backup crontab -e
# 0 2 * * * /var/backups/mysql/dump.sh
#
# Every Monday at 2AM
# 0 2 * * 1 /root/scripts/backup_mysql.sh

## Create 'backup' mysql user
# CREATE USER 'backup'@'localhost' IDENTIFIED BY 's3cr3t';
# GRANT EVENT, LOCK TABLES, PROCESS, REFERENCES, SELECT, SHOW DATABASES, SHOW VIEW, TRIGGER ON *.* TO 'backup'@'localhost' ;

# Changelog:
# Remove duplicate code
# Automatically create output directory
# Gzip backups
# Ignore performance_schema table

USER="root"
PASSWORD="s3cr3t"
OUTPUTDIR="/root/backups_mysql"
MYSQLDUMP="/usr/bin/mysqldump"
MYSQL="/usr/bin/mysql"
TODAY=$(date +%F)

if [ -z "$1" ]; then
	databases=`$MYSQL --user=$USER --password=$PASSWORD --batch --skip-column-names -e "SHOW DATABASES;" | grep -v 'mysql\|information_schema\|performance_schema'`
else
	databases=${@}
fi

for database in $databases; do
	echo $database
	mkdir -p "$OUTPUTDIR/${database}"
	$MYSQLDUMP \
	--user=$USER --password=$PASSWORD \
	--force \
	--quote-names --dump-date \
	--opt --single-transaction \
	--events --routines --triggers \
	--databases $database \
	--result-file="$OUTPUTDIR/${database}/${database}_${TODAY}.sql"
	gzip -9 "$OUTPUTDIR/${database}/${database}_${TODAY}.sql"
done