定时备份mysql

核心思路：

mysqldump命令

cron定时任务

创建脚本：backup.sh

#!/bin/bash

#保存备份个数，备份120份数据

number=120

#备份保存路径

backup_dir=/home/backup

#日期

time=`date +%Y-%m-%d-%H-%M-%S`
#备份工具

tool=mysqldump

#用户名

username=prod

#密码

password=******

#将要备份的数据库

database_name=my_blog_db 

#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
#mysqldump -h host -u username -p dbname | gzip 远程写法
$tool -u $username -p$password $database_name > $backup_dir/$database_name-$time.sql

#写创建备份日志

echo "create $backup_dir/$database_name-$time.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
 

创建cron

    crontab -e
	
	0 2 * * * /etc/mysql/backup.sh

systemctl restart crond.service

例子：

SHELL=/bin/bash
PATH=/sbin:/bin:/usr/sbin:/usr/bin
MAILTO=root

# For details see man 4 crontabs

# Example of job definition:
# .---------------- minute (0 - 59)
# |  .------------- hour (0 - 23)
# |  |  .---------- day of month (1 - 31)
# |  |  |  .------- month (1 - 12) OR jan,feb,mar,apr ...
# |  |  |  |  .---- day of week (0 - 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat
# |  |  |  |  |
# *  *  *  *  * user-name  command to be executed
*/5 * * * *  /etc/mysql/backup.sh