#! /bin/bash

TIMESTAMP=$(date +"%F")
BACKUP_TOP_DIR="/mnt/mysql_backup"
BACKUP_DIR="$BACKUP_TOP_DIR/$TIMESTAMP"
MYSQL_USER="root"
MYSQL=/usr/bin/mysql
MYSQL_PASSWORD="2aaHfUGrQFg3"
MYSQLDUMP=/usr/bin/mysqldump
IONICE="ionice -c 2 -n 6"
NICE="nice -n 10"

mkdir -p "$BACKUP_DIR"

# clean old backups
find "$BACKUP_TOP_DIR" -maxdepth 1 -type d -mtime +14 -exec rm -rf {} +

databases=`$MYSQL --user=$MYSQL_USER -p$MYSQL_PASSWORD -e "SHOW DATABASES;" | grep -Ev "(Database|information_schema|performance_schema)"`

echo "Starting $0 on $TIMESTAMP"
for db in $databases; do
  echo "* backing up $db"
  $IONICE $NICE $MYSQLDUMP --force --opt --user=$MYSQL_USER -p$MYSQL_PASSWORD --databases $db | pigz -9 > "$BACKUP_DIR/$db.gz"
done