Linux企业实战 --varnish（清除缓存）

1. 操作命令清理varnish缓存

新版varnish会有部分操作命令。

[root@server1 ~]# varnishadm
200        
-----------------------------
Varnish Cache CLI 1.0
-----------------------------
Linux,3.10.0-514.el7.x86_64,x86_64,-junix,-smalloc,-sdefault,-hcritbit
varnish-6.3.1 revision 6e96ff048692235e64565211a38c41432a26c055

Type 'help' for command list.
Type 'quit' to close CLI session.

varnish> ban req.url ~ "/index.html"    # 200表示清理成功
200 

2. 安装bansys（帮助清除varnish内存）

步骤一：下载安装包。

[root@server1 ~]# yum install php unzip httpd -y
[root@server1 ~]# unzip bansys.zip -d /var/www/html/
[root@server1 ~]# mv /var/www/html/bansys/* /var/www/html/

因为bansys是用php语言编写的，因为需要下载php安装包。

步骤二：更改httpd的端口，（80端口被varnish占用）

[root@server1 ~]# vim /etc/httpd/conf/httpd.conf 
#Listen 12.34.56.78:80
Listen 8080

[root@server1 ~]# cd /var/www/html/
[root@server1 html]# ls
bansys            config.php  purge_action.php
class_socket.php  index.php   static

[root@server1 html]# vim config.php 
<?php


 //varnish主机列表
 //可定义多个主机列表
 $var_group1 = array(
                        'host' => array('172.25.254.1'),
                                                'port' => '8080',
                    );


 //varnish群组定义
 //对主机列表进行绑定
 $VAR_CLUSTER = array(
                         'www.westos.org' => $var_group1,
                     );


 //varnish版本
 //2.x和3.x推送命令不一样
 $VAR_VERSION = "3";

?>
[root@server1 html]# systemctl start httpd

测试：172.25.42.1:8080

3. varnish推送平台

[root@server1 html]# vim /etc/varnish/default.vcl 

acl westos {
        "127.0.0.1";   # 谁可以推送
        "172.25.60.0"/24;
}


sub vcl_recv {
    # Happens before we check if we have this in cache already.
    #
    # Typically you clean up the request here, removing cookies you don't need,
    # rewriting the request, etc.
#     if (req.http.host ~ "^(www.)?westos.org"){
#        set req.http.host = "www.westos.org";
#        set req.backend_hint = lb.backend();
#        return (pass);
#} elsif (req.http.host ~ "^bbs.westos.org"){
#       set req.backend_hint = web2;
#  } else {
#       return (synth(405));
#    }
        if (req.method == "BAN"){
                if (!client.ip ~ westos){
                        return (synth(405,"Not allowed"));
        }
        ban ("req.url ~" + req.url);
        return (purge);   # 取出相应的缓存对象清除
        }
}

真机上修改域名解析

[root@foundation60 kiosk]# vim /etc/hosts
172.25.42.1 www.westos.org 

server1:

[root@server1 html]# systemctl restart varnish

测试：真机（172.25.42.250）

推送测试
推送=清除
推送内容：**.***表示全部