本文介绍CentOS系统下配置安装varnish服务器，希望对于Varnish入门者给与帮助。更多Varnish资源请本站内搜索。
先执行
rpm --nosignature -i http://repo.varnish-cache.org/redhat/varnish-3.0/el5/noarch/varnish-release-3.0-1.noarch.rpm
指定安装包下载源，然后安装
yum install varnish
安装成功后，修改配置文件。
先假定我的Varnish安装在192.168.0.50上，另外有一台192.168.0.51服务器，我想通过varnish服务来代理针对于50上nginx和51上的nginx项目。这时将50的80端口分给varnish，将nginx的端口改为81或者8080等其它端口。设定abc.com 项目内容在50的nginx上，def.com项目内容在51的nginx上，这时将这2个域名都解析到50的80端口上，也就是varnish上。
vi /etc/varnish/default.vcl
# This is a basic VCL configuration file for varnish. See the vcl(7)
# man page for details on VCL syntax and semantics.
#
# Default backend definition. Set this to point to your content
# server.
#
backend default {
.host = "127.0.0.1";
.port = "81";
}
backend test {
.host = "192.168.0.51";
.port = "80";
}
#
# Below is a commented-out copy of the default VCL logic. If you
# redefine any of these subroutines, the built-in logic will be
# appended to your code.
sub vcl_recv {
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.request != "GET" &&
req.request != "HEAD" &&
req.request != "PUT" &&
req.request != "POST" &&
req.request != "TRACE" &&
req.request != "OPTIONS" &&
req.request != "DELETE") {
/* Non-RFC2616 or CONNECT which is weird. */
return (pipe);
}
if (req.request != "GET" && req.request != "HEAD") {
/* We only deal with GET and HEAD by default */
return (pass);
}
if (req.http.Authorization || req.http.Cookie) {
/* Not cacheable by default */
return (pass);
}
if (req.http.host ~ "abc.com") {
set req.backend = default;
}
elseif (req.http.host ~ "def.com") {
set req.backend = test;
}
else{
error 404 "Unknown HostName!";
}
return (lookup);
} sub vcl_pipe {
# Note that only the first request to the backend will have
# X-Forwarded-For set. If you use X-Forwarded-For and want to
# have it set for all requests, make sure to have:
# set bereq.http.connection = "close";
# here. It is not set by default as it might break some broken web
# applications, like IIS with NTLM authentication.
return (pipe);
}
sub vcl_pass {
return (pass);
}
sub vcl_hash {
hash_data(req.url);
if (req.http.host) {
hash_data(req.http.host);
} else {
hash_data(server.ip);
}
return (hash);
}
sub vcl_hit {
return (deliver);
}
sub vcl_miss {
return (fetch);
}
sub vcl_fetch {
if (beresp.ttl <= 0s ||
beresp.http.Set-Cookie ||
beresp.http.Vary == "*") {
/*
* Mark as "Hit-For-Pass" for the next 2 minutes
*/
set beresp.ttl = 120 s;
return (hit_for_pass);
}
return (deliver);
}
sub vcl_deliver {
return (deliver);
}
sub vcl_error {
set obj.http.Content-Type = "text/html; charset=utf-8";
set obj.http.Retry-After = "5";
synthetic {"
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<title>"} + obj.status + " " + obj.response + {"</title>
</head>
<body>
<h1>Error "} + obj.status + " " + obj.response + {"</h1>
<p>"} + obj.response + {"</p>
<h3>Guru Meditation:</h3>
<p>XID: "} + req.xid + {"</p>
<hr>
<p>Varnish cache server</p>
</body>
</html>
"};
return (deliver);
}
sub vcl_init {
return (ok);
}
sub vcl_fini {
return (ok);
}
按上诉配置后保存。
然后个人没有用系统自带的service启动，写了shell命令进行启动，可将其保存为restart_varnish.sh，启动时执行即可。内容如下：
pkill varnish
/usr/sbin/varnishd -u www -g www -f /etc/varnish/default.vcl -p http_max_hdr=256 -p http_req_hdr_len=8192 -p http_resp_hdr_len=16384 -p connect_timeout=30s -p send_timeout=60s -s malloc,1G -T 127.0.0.1:2000 -a 0.0.0.0:80
其中用户www和用户组www都是之前通过groupadd和useradd建好的，专门是用来操作varnish的。
配置中的优化以及细节参数以后再写。
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