环境：  Centos 7.4      Varnish4.0

            varnish :172.20.100.10   web1：172.20.100.11     web2: 172.20.100.12

1、安装varnish

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

2、编辑配置

[root@localhost ~]# vim /etc/varnish/varnish.params

 RELOAD_VCL=1
 VARNISH_VCL_CONF=/etc/varnish/varnish.vcl        #规则配置文件，默认名为default.vcl
 VARNISH_LISTEN_PORT=80                           #监控端口，默认为6081
 VARNISH_ADMIN_LISTEN_ADDRESS=127.0.0.1           #管理监听地址
 VARNISH_ADMIN_LISTEN_PORT=6082                   #管理监听端口
 VARNISH_SECRET_FILE=/etc/varnish/secret          #管理共享密钥文件
 VARNISH_STORAGE="malloc,256M"                    #Varnish 4中默认使用malloc(即内存)作为缓存对象存储方式；
 VARNISH_USER=varnish                             #用户id
 VARNISH_GROUP=varnish

3、配置vcl

[root@localhost ~]# egrep -v "^$|#" /etc/varnish/default.vcl >/etc/varnish/varnish.vcl

• 简单varnish实例

[root@localhost ~]# vim /etc/varnish/varnish.vcl

 vcl 4.0;
 backend web_server {
 .host = "172.20.100.11";
 .port = "80";
 }
 sub vcl_recv {
 set req.backend_hint = web_server;
 }
 sub vcl_backend_response {
 }

#添加响应X-Cache首部，显示缓存是否命中(可选)

 sub vcl_deliver {
 if (obj.hits > 0) {
 set resp.http.X-Cache = "HIT from " + server.ip;
 } else {
 set resp.http.X-Cache = "MISS";
 }
 }

• varnish缓存多个网站

[root@localhost ~]# vim /etc/varnish/varnish.vcl

 vcl 4.0;
 backend web_server1 {
 .host = "172.20.100.11";
 .port = "80";
 }
 backend web_server2 {
 .host = "host-44-94-206-116.cdn-hk.com";
 .port = "80";
 }

 sub vcl_recv {
 if (req.http.host ~ "(?i)^(bbs.)?lncs.net$") {
 set req.http.host = "lncs.net";
 set req.backend_hint = web_server1;
 } elsif (req.http.host ~ "(?i)^www.lncs.net$") {
 set req.backend_hint = web_server2;
 return(hash);
 }
 }

 sub vcl_backend_response {
 }
 sub vcl_deliver {
 if(obj.hits > 0){
 set resp.http.X-Cache = "HIT from"+req.http.host;
 set resp.http.X-Cache-Hits = obj.hits;
 }else{
 set resp.http.XCache = "MISS from"+req.http.host;
 }
 return (deliver);
 }

4、测试

• 简单varnish

[root@qunniao3 ~]# curl -I 172.20.100.10
 HTTP/1.1 200 OK
 Date: Thu, 17 May 2018 18:41:36 GMT
 Server: Apache/2.4.6 (CentOS)
 Last-Modified: Thu, 17 May 2018 16:38:11 GMT
 ETag: "e-56c69760a59c0"
 Content-Length: 14
 Content-Type: text/html; charset=UTF-8
 X-Varnish: 11 3
 Age: 22
 Via: 1.1 varnish-v4
 X-Cache: HIT from 172.20.100.10
 Connection: keep-alive

• varnish多个网站

[root@qunniao3 ~]# vim /etc/hosts

 172.20.100.10 www.lncs.net
 172.20.100.10 bbs.lncs.net

[root@qunniao3 ~]# curl -I www.lncs.net

 HTTP/1.1 200 OK
 Content-Type: text/html; charset=UTF-8
 Vary: Accept-Encoding
 Server: Microsoft-IIS/7.5
 Link: <http://www.qunniao.net/index.php?rest_route=/>; rel="https://api.w.org/"
 X-Frame-Options: SAMEORIGIN
 Set-Cookie: _d_id=4e0f07b1799ce3547109146293e640; Path=/; HttpOnly
 Date: Thu, 17 May 2018 11:42:44 GMT
 X-Varnish: 2
 Age: 0
 Via: 1.1 varnish-v4
 XCache: MISS fromwww.lncs.net
 Connection: keep-alive

[root@qunniao3 ~]# curl -I bbs.lncs.net

 HTTP/1.1 200 OK
 Date: Thu, 17 May 2018 19:40:21 GMT
 Server: Apache/2.4.6 (CentOS)
 Last-Modified: Thu, 17 May 2018 16:38:11 GMT
 ETag: "e-56c69760a59c0"
 Content-Length: 14
 Content-Type: text/html; charset=UTF-8
 X-Varnish: 32770
 Age: 0
 Via: 1.1 varnish-v4
 XCache: MISS fromlncs.net
 Connection: keep-alive