mysql 定时备份

经过上一次误删数据库的教训,需要重视数据库的备份了。

备份脚本

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#!/bin/bash

# 以下配置信息请自己修改
mysql_user="root" #MySQL备份用户
mysql_password="root" #MySQL备份用户的密码
mysql_host="127.0.0.1"
mysql_port="3306"
mysql_charset="utf8" #MySQL编码
backup_db_arr=("database-1" "database-2") #要备份的数据库名称,多个用空格分开隔开 如("db1" "db2" "db3")
backup_location=/var/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="OFF" #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

# 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[@]})"
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-$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 "database $dbname backup fail!"
fi

done
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

定时执行脚本

使用 crontab 设置定时执行备份数据库的脚本。

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crontab -e

在末尾增加一行:1 */3 * * * /var/space/project/script/mysql_bk.sh ,每 3 小时执行一次脚本。

定时从服务器获取备份的文件

增加一个脚本 ~/script/scpSqlFile.sh:

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scp -r jason@project.com:/var/backup /space/backup

设置定时执行:

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crontab -e

在末尾增加一行:1 */3 * * * /script/scpSqlFile.sh ,每 3 小时执行一次脚本。