官方文档：http://varnish-cache.org/trac/wiki/VCLExampleDirector
主机：node1:192.168.10.201系统：RHEL7.0
后端服务器：node2:192.168.10.202 系统：RHEL7.3
node3:192.168.10.203系统：RHEL7.3
主机设置，yum安装好varnish，启动varnish服务
1、动静分离：web1图片，web2 http服务
[root@node1 ~]# vim /etc/varnish/default.vcl
backend webserver1 {
.host = "192.168.10.202";
.port = "80";
.probe = {
.url ="/test1.html";
}
}
backend webserver2{
.host = "192.168.10.203";
.port = "80";
}
sub vcl_recv {
if (req.url ~ "(?i)/login" || req.url ~ "(?i)/admin") {
return (pass);
}
if (req.url ~ "(?i)\.(jpg|png|gif)$"){
set req.backend_hint = webserver1;
} else {
set req.backend_hint = webserver2;
}
if (req.method == "PRI") {
return (synth(405));
}
if (req.method != "GET" &&
req.method != "HEAD" &&
req.method != "PUT" &&
req.method != "POST" &&
req.method != "TRACE" &&
req.method != "OPTIONS" &&
req.method != "DELETE") {
return (pipe);
}
if (req.method != "GET" && req.method != "HEAD") {
return (pass);
}
if (req.http.Authorization || req.http.Cookie) {
return (pass);
}
return (hash);
}
sub vcl_deliver {
if (obj.hits > 0) {
set resp.http.X-Cache = "HIT from"+server.ip;
} else {
set resp.http.X-Cache = "MISS from"+server.ip;
}
}
[root@node1 ~]# varnishadm -S /etc/varnish/secret -T 127.0.0.1:6082
vcl.load test7 default.vcl
200
VCL compiled.
vcl.use test7
200
VCL 'test7' now active
后端服务器：yum 安装好nginx，测试页
[root@node2 ~]# for i in {1..10};do echo "Page $i on web1" > /usr/share/nginx/html/test$i.html;done
[root@node3 ~]# for i in {1..10};do echo "Page $i on web2" > /usr/share/nginx/html/test$i.html;done
浏览器打开：192.168.10.201：6081/1.jpg
2、负载均衡
[root@node1 ~]# vim /etc/varnish/default.vcl
添加以下代码：
import directors;
sub vcl_init {
new mycluster = directors.round_robin();
mycluster.add_backend(webserver1);
mycluster.add_backend(webserver2);
}
sub vcl_recv中添加：
set req.backend_hint = mycluster.backend();
把示例1的：
if (req.url ~ "(?i)\.(jpg|png|gif)$"){
set req.backend_hint = webserver1;
} else {
set req.backend_hint = webserver2;
}
删除或者注释掉