Linux下Mysql数据库备份

SQL_CMD="/www/server/mysql/bin/mysqldump"
SQL_HOST="IP"
SQL_USR="root"
SQL_PWD="密码"
SQL_DB="数据库名称"
SQL_DIR="/www/backup/database/`date +%y%m%d`"

#判断是否为root用户
if [ $UID -ne 0 ];then
    echo "only use root to exec."
    exit 
fi

#判断该路径是否存在，不存在就创建一个
if [ ! -d $SQL_DIR ];then
    mkdir -p $SQL_DIR
fi

#备份数据库
$SQL_CMD -h$SQL_HOST -u$SQL_USR -p$SQL_PWD $SQL_DB >$SQL_DIR/$SQL_DB.sql

#判断是否备份成功，成功打印出来路径
if [ $? -eq 0 ];then
    echo "Backup mysql already successful."
    echo "Backup path:$SQL_DIR"
else
    echo "Backup mysql failed."
fi

#删除30天以前的备份文件
cd $SQL_DIR/../ ; find . -mtime +30 -exec rm -rf {} ;
echo "Done"

#把脚本加到crontab任务计划里
grep "mysql" /var/spool/cron/root >> /dev/null

if [ $? -ne 0 ];then
    echo "0 0 * * * /bin/bash /root/shell/mysql.sh > /tmp/mysql.log 2>&1" >>/var/spool/cron/root
    /etc/init.d/crond restart
fi