实验环境：CentOS7

Varnish是高性能开源的反向代理服务器和HTTP缓存服务器。

#varnish服务器：172.16.252.142

[root@varnish localhost]#yum -y install varnish

[root@varnish localhost]#cd /etc/varnish

[root@varnish localhost]#ls

default.vcl  secret  varnish.params

#varnish的配置文件

[root@varnish localhost]#vim varnish.params

#varnish需要缓存的服务器端口：

VARNISH_LISTEN_PORT=80

#管理varnish配置文件的工具的端口和地址

VARNISH_ADMIN_LISTEN_ADDRESS=127.0.0.1

VARNISH_ADMIN_LISTEN_PORT=6082

#varnish缓存的两种方式：

VARNISH_STORAGE="malloc,256M"

#VARNISH_STORAGE="file,/data/cache/varnish_cache.bin,2G"

#单服务器的缓存配置：

#

[root@varnish localhost]#vim default.vcl

vcl 4.0;

# Default backend definition. Set this to point to your content server.

#定义后端主机

backend default {

    .host = "172.16.254.47";

    .port = "80";

}

定义purger的访问控制

acl purgers {

        "127.0.0.1"/8;

#       "127.16.0.0"/16;

}

sub vcl_recv {

#被允许的purger才允许清除缓存，否则，提示没有权限

       if (req.method == "PURGE")

           {

              if (client.ip ~ purgers)

                   {

                           return(purge);

                }

    else

                           {

                              return(synth(405,"Purge not allowed" + client.ip));

             }

 }

#定义/admin等文件不允许缓存

if (req.url ~ "(?i)^/(admin|login)")

     {

        return(pass);

     }

#将客户端的ip访问记录在后端服务器

    if (req.restarts == 0)

    {

        if (req.http.X-Forwarded-For)

        {

            set req.http.X-Forwarded-For = req.http.X-Forwarded-For+", "+ client.ip;

        }

        else

        {

            set req.http.X-Forwarded-For = client.ip;

        }

        }

    }
#图片等静态资源的缓存

sub vcl_backend_response {

    if (beresp.http.cache-control !~ "s-maxage")

    {

        if (bereq.url ~ "(?i)\.(jpg|jpeg|png|txt|gif|css|js)$")

        {

            unset beresp.http.Set-Cookie;

            set beresp.ttl = 3600s;

        }

    }

}

#执行purge操作

sub vcl_purge {

    return(synth(200,"Purged"));

}

#首部添加信息

sub vcl_deliver {

    if (obj.hits>0)

    {

        set resp.http.X-Cache = "Hit via" + server.ip;

        }

    else

     {

        set resp.http.X-Cache = "Miss from" + server.ip;

        }    


#后端服务器：

[root@html localhost]#yum -y install httpd

[root@html localhost]#vim /etc/httpd/conf/httpd.conf

#将客户端ip计入访问日志

    LogFormat "%{X-Forwarded-For}i %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined

[root@html localhost]#pwd

/var/www/html

[root@html localhost]#ls

#在以下每个目录下新建index.html

admin  index.html  login  test




#启动varnish的配置文件：




[root@~ localhost]#cd /etc/varnish/

[root@varnish localhost]#ls

default.vcl  secret  varnish.params

[root@varnish localhost]#varnishadm -S secret -T 127.0.0.1:6082

200

-----------------------------

Varnish Cache CLI 1.0

-----------------------------

Linux,3.10.0-514.el7.x86_64,x86_64,-smalloc,-smalloc,-hcritbit

varnish-4.0.4 revision 386f712

Type 'help' for command list.

Type 'quit' to close CLI session.

#列出使用的配置文件

vcl.list

200

available       0 boot

active          0 test1

help

200

help [<command>]

ping [<timestamp>]

auth <response>

quit

banner

status

start

stop

vcl.load <configname> <filename>

vcl.inline <configname> <quoted_VCLstring>

vcl.use <configname>

vcl.discard <configname>

vcl.list

param.show [-l] [<param>]

param.set <param> <value>

panic.show

panic.clear

storage.list

#重载新的配置，并命名为test3

vcl.load test3 default.vcl

200

VCL compiled.

#重载成功之后，使用

vcl.use test3

200

VCL 'test3' now active

vcl.list

200

available       0 boot

available       0 test1

active          0 test3




#测试：




#用curl测试purge，配置中允许127.0.0.1的主机进行purge操作

[root@varnish localhost]#curl -X PURGE http://127.0.0.1/index.html

<!DOCTYPE html>

<html>

  <head>

    <title>200 Purged</title>

  </head>

  <body>

    <h1>Error 200 Purged</h1>

    <p>Purged</p>

    <h3>Guru Meditation:</h3>

    <p>XID: 75</p>

    <hr>

    <p>Varnish cache server</p>

  </body>

</html>






#varnish反代两台服务器时：




[root@varnish localhost]#vim default.vcl

#导入varnish的模块：

import directors;

#定义后端服务器的健康状态检查；

probe healthychk {

#检查的页面地址

    .url = "/index.html";

    .timeout = 5s;

    .window = 8;

    .interval = 2s;

    .threshold = 5;

}

#后端服务器1的命名：default

backend default {

    .host = "172.16.254.47";

    .port = "80";

#引用前面定义的检查策略

    .probe = healthychk;

}

#后端服务器2的命名：imgsrv

backend imgsrv {

    .host = "172.16.253.177";

    .port = "80";

    .probe = healthychk;

}

#启动模块的初始化，添加后端服务器

sub vcl_init {

    new staticsrvs = directors.round_robin();

    staticsrvs.add_backend(default);

    staticsrvs.add_backend(imgsrv);

}

#静态资源的调用设置：

sub vcl_recv {

    if (req.url ~ "(?i)\.(jpg|jpeg|png|gif)$")

    {

        set req.backend_hint = imgsrv;

    } else

    {

        set req.backend_hint = staticsrvs.backend();

    }

#静态资源撤销cookie设置，以便缓存

sub vcl_backend_response {

    if (beresp.http.cache-control !~ "s-maxage")

    {

        if (bereq.url ~ "(?i)\.(jpg|jpeg|png|txt|gif|css|js)$")

        {

            unset beresp.http.Set-Cookie;

            set beresp.ttl = 3600s;

        }

    }

#撤销服务器的私有ip地址以及版本等信息

sub vcl_deliver {

    unset resp.http.Via;

    unset resp.http.X-Varnish;

    unset resp.http.X-Cache;

}

#启动配置文件：

varnish> vcl.load 3 default.vcl

200

VCL compiled.

vcl.use 3

200

VCL '3' now active

vcl.list

200

available       0 boot

available       0 test1

available       0 test3

available       0 1

available       0 2

active          0 3

backend.list

200

Backend name                   Refs   Admin      Probe

default(172.16.254.47,,80)     6      probe      Healthy 8/8

imgsrv(172.16.253.177,,80)     3      probe      Healthy 8/8





#default.vcl文件信息：






#

# This is an example VCL file for Varnish.

#

# It does not do anything by default, delegating control to the

# builtin VCL. The builtin VCL is called when there is no explicit

# return statement.

#

# See the VCL chapters in the Users Guide at https://www.varnish-cache.org/docs/

# and http://varnish-cache.org/trac/wiki/VCLExamples for more examples.

# Marker to tell the VCL compiler that this VCL has been adapted to the

# new 4.0 format.

vcl 4.0;

import directors;

probe healthychk {

    .url = "/index.html";

    .timeout = 5s;

    .window = 8;

    .interval = 2s;

    .threshold = 5;

}

# Default backend definition. Set this to point to your content server.

backend default {

    .host = "172.16.254.47";

    .port = "80";

    .probe = healthychk;

}

backend imgsrv {

    .host = "172.16.253.177";

    .port = "80";

    .probe = healthychk;

}

acl purgers {

    "127.0.0.1"/8;

#    "127.16.0.0"/16;

}

sub vcl_init {

    new staticsrvs = directors.round_robin();

    staticsrvs.add_backend(default);

    staticsrvs.add_backend(imgsrv);

}

sub vcl_recv {

    if (req.url ~ "(?i)\.(jpg|jpeg|png|gif)$")

    {

        set req.backend_hint = imgsrv;

    } else

    {

        set req.backend_hint = staticsrvs.backend();

    }

       if (req.method == "PURGE")

           {

              if (client.ip ~ purgers)

                   {

                           return(purge);

                }

    else

                           {

                              return(synth(405,"Purge not allowed" + client.ip));

             }

 }

    if (req.url ~ "(?i)^/(admin|login)")

     {

        return(pass);

     }

    if (req.restarts == 0)

    {

        if (req.http.X-Forwarded-For)

        {

            set req.http.X-Forwarded-For = req.http.X-Forwarded-For+", "+ client.ip;

        }

        else

        {

            set req.http.X-Forwarded-For = client.ip;

        }

        }

    }

#    if (req.method == "PURGE")

#    {

#        if (client.ip ~ purgers)

#        {

#            return(purge);

#        else

#            {

#                return(synth(405,"Purge not allowed" + client.ip));         }

#        }

#    }

    # 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.

#}

sub vcl_backend_response {

    if (beresp.http.cache-control !~ "s-maxage")

    {

        if (bereq.url ~ "(?i)\.(jpg|jpeg|png|txt|gif|css|js)$")

        {

            unset beresp.http.Set-Cookie;

            set beresp.ttl = 3600s;

        }

    }

    # Happens after we have read the response headers from the backend.

    #

    # Here you clean the response headers, removing silly Set-Cookie headers

    # and other mistakes your backend does.

    unset beresp.http.Server;

    unset beresp.http.X-Powered-By;

}

sub vcl_purge {

    return(synth(200,"Purged"));

}

sub vcl_deliver {

    if (obj.hits>0)

    {

        set resp.http.X-Cache = "Hit via" + server.ip;

        }

    else

     {

        set resp.http.X-Cache = "Miss from" + server.ip;

        }

    unset resp.http.Via;

    unset resp.http.X-Varnish;

    unset resp.http.X-Cache;

    # Happens when we have all the pieces we need, and are about to send the

    # response to the client.

    #

    # You can do accounting or modifying the final object here.

}






#测试：




												


											
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