#!/bin/bash

# Variables
BACKUP_ROOT_MYSQL="/backup/mysql"
MYSQL_BIN=/usr/bin/mysql
MYSQLDUMP_BIN=/usr/bin/mysqldump
MYSQL_USER=backupuser
MYSQL_PASSWORD=backuppwd
GZIP_BIN=/bin/gzip
BACKUP_ROOT_MYSQL_RETENTION=10

# Starting backup
echo "Starting MariaDB backup database process ..."

# Create directories if not exists
mkdir -p ${BACKUP_ROOT_MYSQL}
HOUR=`date +%Y%m%d%H%M`

# Backup with dump the structure
DATABASES=`${MYSQL_BIN} -u${MYSQL_USER} -p${MYSQL_PASSWORD} -e 'SHOW DATABASES' | grep -v - | grep -v Database | grep -v information_schema | grep -v performance_schema | grep -v \|`
for DB in $DATABASES;
do
    ${MYSQLDUMP_BIN} -u ${MYSQL_USER} -p${MYSQL_PASSWORD} ${DB} | ${GZIP_BIN} > ${BACKUP_ROOT_MYSQL}/${DB}_${HOUR}.sql.gz
    if [ $? -ne 0 ]; then
    	echo "ERROR - Dump for ${DB}"
    fi
done

# Purge old backup
echo "Starting MariaDB purge database process ..."
find ${BACKUP_ROOT_MYSQL} -type f -mtime +${BACKUP_ROOT_MYSQL_RETENTION} -exec rm -f {} \;