shell实现定期清理网站缓存数据

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如果第一个脚本不行，可以尝试第二个脚本方案！

网站采用了一些方法进行加速(redis\cdn)，这样就降低用户访问后端MySQL的压力、以及前端速度不太好的问题，对用户请求到的所有页面进行了缓存，既然数据缓存了，解决用户看到的页面是否为最新页面就提上日程，下面这个脚本就诞生了。SourceByrd's Weblog-https://note.t4x.org/code/fresh-web-cache/

#!/bin/bash
# Author:Byrd
# Version:0.1
# Site:note.t4x.org
# Contact:root#t4x.org
# define category
for category in basic code database environment error mobile other project remark route service switch system
do
    for ((i=2;i<15;i++))
    do
        # Define return value
        RETURN=`curl -o /dev/null -s -k -w "%{http_code}" https://note.t4x.org/$category/page/$i/?r=y`
        if [ $RETURN -eq 200 ]; then
            # if return value 200,then flush page and category.
            curl -o /dev/null -s -k -w "%{http_code}" https://note.t4x.org/$category/page/$i/?r=y >/dev/null 2>&1
            curl -o /dev/null -s -k -w "%{http_code}" https://note.t4x.org/$category/?r=y >/dev/null 2>&1
        else
            # if return value not 200,then flush category first page and site page.break
            curl -o /dev/null -s -k -w "%{http_code}" https://note.t4x.org/$category/?r=y >/dev/null 2>&1
            curl -o /dev/null -s -k -w "%{http_code}" https://note.t4x.org/?r=y >/dev/null 2>&1
            break
        fi
    done
done

#!/bin/bash

# Author:Byrd

# Version:0.1

# Site:note.t4x.org

# Contact:root#t4x.org

# define category

for category in basic code database environment error mobile other project remark route service switch system

for ((i=2;i<15;i++))

# Define return value

RETURN=`curl -o /dev/null -s -k -w "%{http_code}" https://note.t4x.org/$category/page/$i/?r=y`

if [ $RETURN -eq 200 ]; then

# if return value 200,then flush page and category.

curl -o /dev/null -s -k -w "%{http_code}" https://note.t4x.org/$category/page/$i/?r=y >/dev/null 2>&1

curl -o /dev/null -s -k -w "%{http_code}" https://note.t4x.org/$category/?r=y >/dev/null 2>&1

else

# if return value not 200,then flush category first page and site page.break

curl -o /dev/null -s -k -w "%{http_code}" https://note.t4x.org/$category/?r=y >/dev/null 2>&1

curl -o /dev/null -s -k -w "%{http_code}" https://note.t4x.org/?r=y >/dev/null 2>&1

break

done

将脚本加入定时任务，由于网站不定期更新，更新不频繁，因此每天执行任务即可。

[root@site scripts]# echo '#flush cache' >>/var/spool/cron/root    #注释                                                
[root@site scripts]# echo '00 2 * * * /bin/sh /byrd/scripts/flush_site.sh >/dev/null 2>&1' >>/var/spool/cron/root    #两点执行计划任务                   
[root@site scripts]# crontab -l
#flush cache
00 2 * * * /bin/sh /byrd/scripts/flush_site.sh >/dev/null 2>&1

[root@site scripts]# echo '#flush cache' >>/var/spool/cron/root #注释

[root@site scripts]# echo '00 2 * * * /bin/sh /byrd/scripts/flush_site.sh >/dev/null 2>&1' >>/var/spool/cron/root #两点执行计划任务

[root@site scripts]# crontab -l

#flush cache

00 2 * * * /bin/sh /byrd/scripts/flush_site.sh >/dev/null 2>&1

SourceByrd's Weblog-https://note.t4x.org/code/fresh-web-cache/

另外一个思路：SourceByrd's Weblog-https://note.t4x.org/code/fresh-web-cache/

1：redis的主要目的是为了缓存数据；
2：把redis缓存数据清空，然后重新启动redis即可完成；
3：因为个人网站一般凌晨4:00左右访问量最低，且更新周期不快；SourceByrd's Weblog-https://note.t4x.org/code/fresh-web-cache/

这个脚本一样的功效，效果不如上面的脚本，上面的额脚本缺点是没有做文章的判断。SourceByrd's Weblog-https://note.t4x.org/code/fresh-web-cache/

[root@www scripts]# cat clean_redis.sh 
#!/bin/bash
# Author:Byrd
# Version:0.1
# Site:note.t4x.org
# Contact:root#t4x.org
CDATA=`ls -l /usr/local/redis/cache/dump.rdb | awk '{print $5}'`    #取得硬盘缓存数据大小
REDIS_PID=`ps aux | grep redis | grep -v grep | awk '{print $2}'`    #取得redis进程id
if [ $CDATA -gt 3145728 ]; then
    >/usr/local/redis/cache/dump.rdb
    #kill ${REDIS_PID}
    sleep 3
    #/usr/local/redis/bin/redis-server /usr/local/redis/etc/redis.conf 
else
    exit 1
fi

[root@www scripts]# cat clean_redis.sh

#!/bin/bash

# Author:Byrd

# Version:0.1

# Site:note.t4x.org

# Contact:root#t4x.org

CDATA=`ls -l /usr/local/redis/cache/dump.rdb | awk '{print $5}'` #取得硬盘缓存数据大小

REDIS_PID=`ps aux | grep redis | grep -v grep | awk '{print $2}'` #取得redis进程id

if [ $CDATA -gt 3145728 ]; then

>/usr/local/redis/cache/dump.rdb

#kill ${REDIS_PID}

sleep 3

#/usr/local/redis/bin/redis-server /usr/local/redis/etc/redis.conf

else

exit 1

SourceByrd's Weblog-https://note.t4x.org/code/fresh-web-cache/

然后定时任务，每周或者每天执行一次即可！SourceByrd's Weblog-https://note.t4x.org/code/fresh-web-cache/ SourceByrd's Weblog-https://note.t4x.org/code/fresh-web-cache/

Today in History

May

2014PHP配置XCache、MemCache、OPcache扩展

申明：除非注明Byrd's Blog内容均为原创,未经许可禁止转载!详情请阅读版权申明!

Comments 5 Guest 5

幽烛 0
August 31, 2016 11:15 上海市 3F

内容专业，速度够快
张戈 0
August 29, 2016 22:28 上海市 2F

其实redis使用?c=y就能刷新全部缓存：
缓存问题
index-with-redis.php中有注释
Appending a ?c=y to a url deletes the entire cache of the domain, only works when you are logged in
Appending a ?r=y to a url deletes the cache of that url
Submitting a comment deletes the cache of that page
Refreshing (f5) a page deletes the cache of that page
登录后台网站url后面加上?c=y即可刷新整个网站
可以在网站页面后面加上?r=y即可手工刷新
提交评论会自动刷新页面
刷新(f5)页面也可以刷新页面
- Byrd
  August 30, 2016 11:04 上海市 B1
  
  @ 张戈其实还是有问题，前提是登陆后刷新、或者有人评论、又或者F5刷新，大概三个方式。都必须人为操作，我最原始想法是模拟F5来进行，脚本不好操作，就想redis方面来想办法。其实两个脚本都没有很好的实现我想要的效果。
斯托克笔记 0
May 17, 2016 22:13 上海市 1F

哇哦，好专业的博客。
- Byrd
  May 21, 2016 20:35 河北省张家口市 B1
  
  @ 斯托克笔记多谢支持哦！~

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