【MySQL】MySQL分库定时备份脚本

不念不忘少年蓝@ 2024-04-01 11:50 94阅读 0赞

#### 一、创建一个 `shell`脚本文件 ####

vim mysqb_ackup.sh

#!/bin/bash
    
    # 以下配置信息请自己修改
    mysql_user="root" #MySQL备份用户
    mysql_password="*******" #MySQL备份用户的密码
    mysql_host="localhost"
    mysql_port="3306"
    mysql_charset="utf8" #MySQL编码
    backup_db_arr=("s_community_hc" "s_community_tt" "test_s_community" "test_tt") #要备份的数据库名称，多个用空格分开隔开 如("db1" "db2" "db3")
    backup_location=/data/backup  #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
    expire_backup_delete="ON" #是否开启过期备份删除 ON为开启 OFF为关闭
    expire_days=60 #过期时间天数 默认为三天，此项只有在expire_backup_delete开启时有效
    
    # 本行开始以下不需要修改
    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_3ago=`date -d '3 days ago' +%Y-%m-%d` #3天之前的日期
    backup_dir=$backup_location/$backup_Ymd  #备份文件夹全路径
    welcome_msg="Welcome to use MySQL backup tools!" #欢迎语
    
    # 判断MYSQL是否启动,mysql没有启动则备份退出
    mysql_ps=`ps -ef |grep mysql |wc -l`
    mysql_listen=`netstat -an |grep LISTEN |grep $mysql_port|wc -l`
    if [ [$mysql_ps == 0] -o [$mysql_listen == 0] ]; then
            echo "ERROR:MySQL is not running! backup stop!"
            exit
    else
            echo $welcome_msg
    fi
    
    # 连接到mysql数据库，无法连接则备份退出
    mysql -h$mysql_host -P$mysql_port -u$mysql_user -p$mysql_password <<end
    use mysql;
    select host,user from user where user='root' and host='localhost';
    exit
    end
    
    flag=`echo $?`
    
    if [ $flag != "0" ]; then
            echo "ERROR:Can't connect mysql server! backup stop!"
            exit
    else
            echo "MySQL connect ok! Please wait......"
            # 判断有没有定义备份的数据库，如果定义则开始备份，否则退出备份
            if [ "$backup_db_arr" != "" ];then
                    #dbnames=$(cut -d ',' -f1-5 $backup_database)
                    #echo "arr is (${backup_db_arr[@]})"
                    logId=`mysql -h$mysql_host -P$mysql_port -u$mysql_user -p$mysql_password -sN -Dmysql_backup -e "INSERT INTO mysql_backup_log (mysql_host, start_time,  host) VALUES ('127.0.0.1', now(),  '127.0.0.1');SELECT LAST_INSERT_ID();"`
    
                    for dbname in ${backup_db_arr[@]}
                    do
                            echo "database $dbname backup start..."
    
                            `mkdir -p $backup_dir`
                            `mysqldump -h$mysql_host -P$mysql_port -u$mysql_user -p$mysql_password $dbname --default-character-set=$mysql_charset | gzip > $backup_dir/$dbname.sql.gz`
                            flag=`echo $?`
                            if [ $flag == "0" ];then
                                    echo "database $dbname success backup to $backup_dir/$dbname.sql.gz"
                            else
                                    echo "database $dbname backup fail!"
                            fi
                            
                    done
                    
                    files=`ls $backup_dir|awk 'BEGIN{ret=""}{ret=ret","$0}END{print substr(ret,2)}'`
                    mysql -h$mysql_host -P$mysql_port -u$mysql_user -p$mysql_password -sN -Dmysql_backup -e "update mysql_backup_log set end_time=now(),note='${files}' where id=$logId"
    
    
            else
                    echo "ERROR:No database to backup! backup stop"
                    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 $backup_location/ -type d -o -type f -ctime +$expire_days -exec rm -rf {} \;`
                     `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!"
            exit
    fi

#### 二、 定时任务 ####

设置每天凌晨3:00定时自动备份

crontab -e
    
    00 03 * * * /root/mysql_backup.sh

#### 三、创建备份记录库和记录表 ####

create  database mysql_backup
    
    CREATE TABLE `mysql_backup_log` (
      `id` bigint(20) NOT NULL AUTO_INCREMENT,
      `mysql_host` varchar(30) NOT NULL,
      `start_time` datetime DEFAULT NULL,
      `end_time` datetime DEFAULT NULL,
      `host` varchar(30) DEFAULT NULL,
      `note` varchar(255) DEFAULT NULL,
      PRIMARY KEY (`id`)
    ) ;