CentOS Mysql数据库如何实现定时备份

#!/bin/bash#保存备份个数，最多保留4个文件number=4#备份保存路径backup_dir=/db/backup_mysql#日期dd=`date +%Y-%m-%d-%H-%M-%S`#备份工具tool=mysqldump#用户名username=root#密码password=yourpassword#将要备份的数据库database_name=mydb#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 -h127.0.0.1 -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 $9 }' | head -1`#判断现在的备份数量是否大于$numbercount=`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.txtfi