利用Varnish做Discuz论坛的缓存服务器
实验背景：公司有一台BBS服务器，用的是LNMP的架构搭建的。正好手头有一台空闲的虚拟机，于是想着给BBS前端加一台缓存服务器。于是选定了varnish，搜了很多教程，跌跌撞撞的完成了配置。这其中很多配置的作用我也不是十分了解，这里先给出大体的配置，之后有时间会研究一下其中配置的原理和具体作用。
实验系统：CentOS 6.4_x86_64
实验前提：防火墙和selinux都关闭
实验说明：本实验共有2台主机，IP分配如拓扑
实验软件：varnish-3.0.7-1 varnish-libs-3.0.7-1
下载地址：http://pan.baidu.com/s/1pJOOc1X
或者：
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具体下载目录在 /2015年资料/8月/18日/利用Varnish做Discuz论坛的缓存服务器/
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实验拓扑：
二、访问测试：
1.浏览器打开http://192.168.70.186，并随机访问一些内容：
2.varnish状态查看：
varnishstat
3.图表查看：
varnishhist
4.前端客户端用浏览器的F12功能查看缓存是否命中，这里用chrome演示：
至此，缓存服务器搭建完毕，这其中还会有些问题，今天先粗浅的演示一下
一、安装并配置varnish
1.在70.186上直接使用yum安装：
yum -y install varnish-3.0.7-1.el6.x86_64.rpm varnish-libs-3.0.7-1.el6.x86_64.rpm
2.编辑/etc/sysconfig/varnish文件：
vim /etc/sysconfig/varnish
------------------------------------------------>
## Alternative 3, Advanced configuration
VARNISH_VCL_CONF=/etc/varnish/default.vcl //使用的vcl文件
VARNISH_LISTEN_PORT=80 //varnish自己监听的端口
VARNISH_ADMIN_LISTEN_ADDRESS=127.0.0.1 //admin管理接口使用的ip
VARNISH_ADMIN_LISTEN_PORT=6082 //admin管理接口使用的端口
VARNISH_SECRET_FILE=/etc/varnish/secret //密码文件
VARNISH_MIN_THREADS=50 //最小进程数
VARNISH_MAX_THREADS=1000 //最大进程数
VARNISH_THREAD_TIMEOUT=120 //超过此时间回收空闲进程
VARNISH_STORAGE_SIZE=1G //存储文件大小
VARNISH_STORAGE="malloc,${VARNISH_STORAGE_SIZE}" //指明使用存储的类型及文件
VARNISH_TTL=120
DAEMON_OPTS="-a ${VARNISH_LISTEN_ADDRESS}:${VARNISH_LISTEN_PORT} \
-f ${VARNISH_VCL_CONF} \
-T ${VARNISH_ADMIN_LISTEN_ADDRESS}:${VARNISH_ADMIN_LISTEN_PORT} \
-t ${VARNISH_TTL} \
-w ${VARNISH_MIN_THREADS},${VARNISH_MAX_THREADS},${VARNISH_THREAD_TIMEOUT} \
-u varnish -g varnish \
-S ${VARNISH_SECRET_FILE} \
-s ${VARNISH_STORAGE}"
3.编辑vcl文件：
vim /etc/varnish/default.vcl
--------------------------------------------------------->
backend default {
.host = "192.168.90.186";
.port = "80";
}
acl local {
"localhost";
"127.0.0.1";
}
sub vcl_recv {
if (req.restarts == 0) {
if (req.http.x-forwarded-for) {
set req.http.X-Forwarded-For =
req.http.X-Forwarded-For + ", " + client.ip;
} else {
set req.http.X-Forwarded-For = client.ip;
}
}
if(req.request == "PURGE") {
if (!client.ip ~ local) {
error 405 "Not Allowed.";
}
return (lookup);
}
if (req.request == "GET" && req.url ~ "\.(jpg|png|gif|swf|jpeg|flv|bmp|gz|tgz|bz2|tbz|js|css|ico)$") {
unset req.http.cookie;
}
if (req.request == "GET" && req.url ~ "\.(js|css).*$") {
unset req.http.cookie;
}
if (req.url ~ "^/images") {
unset req.http.cookie;
}
if (req.request != "GET" &&
req.request != "HEAD" &&
req.request != "PUT" &&
req.request != "POST" &&
req.request != "TRACE" &&
req.request != "OPTIONS" &&
req.request != "DELETE") {
return (pipe);
}
if (req.request != "GET" && req.request != "HEAD") {
return (pass);
}
if (req.http.Authorization || req.http.Cookie) {
return (pass);
}
if (req.request == "GET" && req.url ~ "\.(php)($|\?)") {
return (pass);
}
return (lookup);
}
sub vcl_pipe {
return (pipe);
}
sub vcl_pass {
if (req.request == "PURGE") {
error 502 "PURGE on a passed object";
}
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 {
if (!obj.ttl > 0s) {
return (pass);
}
if (req.request == "PURGE") {
purge;
error 200 "Purged.";
}
return (deliver);
}
sub vcl_miss {
if (req.request == "PURGE") {
purge;
error 404 "Not in cache";
}
return (fetch);
}
sub vcl_fetch {
if (beresp.ttl <= 0s ||
beresp.http.Set-Cookie ||
beresp.http.Vary == "*") {
set beresp.ttl = 120 s;
return (hit_for_pass);
}
if (beresp.http.Pragma ~ "no-cache" ||
beresp.http.Cache-Control ~ "no-cache" ||
beresp.http.Cache-Control ~ "private") {
return (hit_for_pass);
}
if (req.request == "GET" && req.url ~ "\.(bmp|jpeg|jpg|png|gif|svg|png|ico|txt|css|js|html|htm)$") {
unset beresp.http.set-cookie;
set beresp.ttl = 1h;
} else {
set beresp.ttl = 1800s;
}
return (deliver);
}
sub vcl_deliver {
if (obj.hits > 0) {
set resp.http.X-Cache = "Hit Via" + " " + server.hostname;
} else {
set resp.http.X-Cache = "Miss Via" + " " + server.hostname;
}
return (deliver);
}
sub vcl_init {
return (ok);
}
sub vcl_fini {
return (ok);
}
4.启动varnish，查看端口，并打开浏览器测试：
service varnish start
ss -tnl
二、访问测试：
1.浏览器打开http://192.168.70.186，并随机访问一些内容：
2.varnish状态查看：
varnishstat
3.图表查看：
varnishhist
4.前端客户端用浏览器的F12功能查看缓存是否命中，这里用chrome演示：
至此，缓存服务器搭建完毕，这其中还会有些问题，今天先粗浅的演示一下.
Varnish 的详细介绍：请点这里
Varnish 的下载地址：请点这里