MySQL数据库定时自动备份

welcome_msg="===== Welcome to use MySQL backup tools! ====="
mysql_ps=`ps -ef |grep mysql |wc -l`
mysql_listen=`netstat -an |grep LISTEN |grep $mysql_port|wc -l`


mysql_user="xxx" #MySQL备份用户
mysql_password="xxx" #MySQL备份用户的密码
mysql_host="localhost"
mysql_port="3306"
mysql_charset="utf8" #MySQL编码
mysql_test_db="xxx"#用于测试连接的数据库

expire_backup_delete="ON" #是否开启过期备份删除 ON为开启 OFF为关闭
expire_days=3 #过期时间天数 默认为三天，此项只有在expire_backup_delete开启时有效

backup_db_arr=("xxx") #要备份的数据库名称，多个用空格分开隔开 如("db1" "db2" "db3")
backup_time=`date +%Y%m%d%H%M`  #定义备份详细时间
backup_Ymd=`date +%Y-%m-%d` #定义备份目录中的年月日时间
backup_location=/root/backup/mysqlbak  #备份数据存放位置，末尾请不要带"/",此项可以保持默认，程序会自动创建文件夹
backup_dir=$backup_location/$backup_Ymd  #备份文件夹全路径


# 判断mysql是否启动
if [ [$mysql_ps == 0] -o [$mysql_listen == 0] ]; then
    echo -e "[ERROR] MySQL is not running! backup stop! \n"
    exit
else
    echo $welcome_msg
fi


# 判断mysql是否能正常连接
mysql -h$mysql_host -P$mysql_port -u$mysql_user -p$mysql_password <<end
use xxx;
select database();
exit
end
flag=`echo $?`
if [ $flag != "0" ]; then
    echo -e "[ERROR]:Can't connect mysql server! backup stop! \n"
    exit
else
    echo "MySQL connect ok! Please wait......"
fi


# 判断有没有定义备份的数据库，如果定义则开始备份，否则退出备份
if [ "$backup_db_arr" != "" ];then
    #dbnames=$(cut -d ',' -f1-5 $backup_database)
    # echo "arr is (${backup_db_arr[@]})"
    for dbname in ${backup_db_arr[@]}
    do
        echo "  database $dbname backup start..."
        `mkdir -p $backup_dir`
        # 加上-–single-transaction，导数据之前就会启动一个事务，来确保拿到一致性视图。前提是引擎要支持这个隔离级别
        `mysqldump -h$mysql_host -P$mysql_port -u$mysql_user -p$mysql_password $dbname --default-character-set=$mysql_charset | gzip > $backup_dir/$dbname-$backup_time.sql.gz`
        flag=`echo $?`
        if [ $flag == "0" ];then
            echo "  database $dbname success backup to $backup_dir/$dbname-$backup_time.sql.gz"
        else
            echo "  [ERROR]:database $dbname backup fail!"
        fi
    done
else
    echo -e "[ERROR]:No database to backup! backup stop! \n"
    exit
fi


# 如果开启了删除过期备份，则进行删除操作
if [ "$expire_backup_delete" == "ON" -a  "$backup_location" != "" ];then
    `find $backup_location/ -type d -mtime +$expire_days | xargs rm -rf`
    echo "Expired backup data delete complete!"
fi
echo "All database backup success! Thank you!"
echo -e "===========================================\n\n"
exit

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