MySQL数据库备份多循环(实用）

定时任务：

vi /etc/crontab

00 00 * * * root sh /mnt/data/zzy/scripts/backupMySQL_alldb.sh &>/dev/null

cat backupMySQL_alldb.sh

#!/bin/bash 

#用户名
username=root
#密码
password=aaa.4A3c#
HOST=127.0.0.1
#保存备份个数，备份31天数据
number=3

#日期
dd=`date +%Y-%m-%d-%H-%M-%S`
#备份工具
tool=/usr/local/mysql/bin/mysqldump
echo $tool
socketpath=/mnt/data/mysqldata/mysql.sock

#备份保存路径

zzy="/mnt/data/zzy"  


DB_LIST=$(mysql  --socket=$socketpath  -u$username -p$password -s -e "show databases;" 2>/dev/null |egrep -v "Database|information_schema|mysql|performance_schema|sys")

echo $DB_LIST
for DB in $DB_LIST; do

	#将要备份的数据库
	database_name=$DB

	backup_dir=${zzy}/data/back/mysql-${database_name}

	mkdir -p ${backup_dir}


	#如果文件夹不存在则创建
	if [ ! -d $backup_dir ]; then  
		mkdir -p $backup_dir;
	fi


	#简单写法 mysqldump -u root -p123456 users > /root/mysqlbackup/users-$filename.sql
	$tool --socket=$socketpath -u $username -p$password $database_name > $backup_dir/$database_name-$dd.sql 

	#写创建备份日志
	echo "create $backup_dir/$database_name-$dd.dupm" >> $backup_dir/log.txt  
	 
	#找出需要删除的备份
	delfile=`ls -l -crt $backup_dir/*.sql | awk '{print $9 }' | head -1`

	#判断现在的备份数量是否大于$number
	count=`ls -l -crt $backup_dir/*.sql | awk '{print $9 }' | wc -l`

	if [ $count -gt $number ]; then
		#删除最早生成的备份，只保留number数量的备份
		rm $delfile
		#写删除文件日志
		echo "delete $delfile" >> $backup_dir/log.txt
	fi

	echo $backup_dir

done