数据库定时备份原理，代码

前几篇博客已经相继公开了去转盘网的所有技术细节，如下： 百度网盘爬虫中文分词算法邀请好友注册js分页部分代码这篇博客我将继续公开数据库自动备份的代码。可以这么说，没有数据库，一切就是个蛋，没有数据库备份，一切还是个蛋，你可以想象数据库备份多么重要。不会linux，不会写shell的朋友麻烦先去补补。不过你说我牛逼，不补也能看懂，那没问题，哈哈，废话不说了。老规矩，上代码：

[#!/bin/bash]
time=$(date +"%d-%m-%Y")
pre=/home/ubuntu #想放到那里麻烦自己配置下哈
if [ ! -d "$pre/data_backup/$time" ]
then
  mkdir -p $pre/data_backup/$time
  echo "create $pre/data_backup/$time"
else
  echo "exist $pre/data_backup/$time"
fi
if [ -d "$pre/data_backup/$time" ]
then
 mysqldump -h10.66.102.75 -uroot -p123456 --opt winrun user > $pre/data_backup/$time/user.sql
 mysqldump -h10.66.102.75 -uroot -p123456--opt winrun CategoryInfo  > $pre/data_backup/$time/CategoryInfo.sql
 mysqldump -h10.66.102.75 -uroot -p123456 --opt winrun admin_info > $pre/data_backup/$time/admin_info.sql
 mysqldump -h10.66.102.75 -uroot -p123456 --opt winrun admin_loginfo > $pre/data_backup/$time/admin_loginfo.sql
 mysqldump -h10.66.102.75 -uroot -p123456 --opt winrun admin_notice_info  > $pre/data_backup/$time/admin_notice_info.sql
 mysqldump -h10.66.102.75 -uroot -p123456--opt winrun advertising_info  > $pre/data_backup/$time/advertising_info.sql
 mysqldump -h10.66.102.75 -uroot -p123456--opt winrun ajax_request_info  > $pre/data_backup/$time/ajax_request_info.sql
 mysqldump -h10.66.102.75 -uroot -p123456 --opt winrun bt_file_info  > $pre/data_backup/$time/bt_file_info.sql
 echo "backup finished"
 cd $pre/data_backup #enter dir
 zip -r $time.zip $time/
 rm -fr $time #delete
 cd -
 echo "zip backup database finished"
else
 echo "can not find backup file"
fi
\n```
注意，我的密码我已经改了，这个不能告诉你们，所以喜欢copy的孩子麻烦自己该密码。下面我教大家玩下crotab，代码如下：
```shell\n
[# Edit this file to introduce tasks to be run by cron.]
[#]
[# Each task to run has to be defined through a single line ]
[# indicating with different fields when the task will be run]
[# and what command to run for the task]
[#]
[# To define the time you can provide concrete values for]
[# minute (m), hour (h), day of month (dom), month (mon),]
[# and day of week (dow) or use '*' in these fields (for 'any').#]
[# Notice that tasks will be started based on the cron's system]
[# daemon's notion of time and timezones.]
[#]
[# Output of the crontab jobs (including errors) is sent through]
[# email to the user the crontab file belongs to (unless redirected).]
[#]
[# For example, you can run a backup of all your user accounts]
[# at 5 a.m every week with:]
[# 0 5 * * 1 tar -zcf /var/backups/home.tgz /home/]
[#]
[# For more information see the manual pages of crontab(5) and cron(8)]
[#]
[# m h  dom mon dow   command]
10 1 * * 1,3,5  /home/backup.sh >> /home/backup.log
\n```
有用的是最下面的这一句，看到没有，备份完了还得有个log，不然谁知道备份成什么样子了，一点都不懂crontab麻烦自己百度下，我也一时给你讲不明白。
![](http://s5.51cto.com/wyfs02/M02/80/6A/wKiom1dAfLaR-38zAAAWLq160FQ714.png)
上面是备份的结果，注意，备份完了之后是压缩包的形式，所以请你先安装压缩工具，apt-get install XXXX 不会的还是麻烦百度下，实在简单成狗了。
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