系统环境: rhel6 x86_64 iptables and selinux disabled
主机: 192.168.122.160:virnish apache server60.example.com
192.168.122.154:apache server54.example.com
192.168.122.1 desktop36.example.com
相关网址: http://repo.varnish-cache.org/redhat/varnish-3.0/el6/x86_64/
所需的包:varnish-libs-3.0.4-1.el6.x86_64.rpm varnish-3.0.4-1.el6.x86_64.rpm bansys.zip
VCL处理流程图
处理过程大致分为如下几个步骤:
(1)Receive 状态,也就是请求处理的入口状态,根据 VCL 规则判断该请求应该是 Pass 或
Pipe,或者进入 Lookup(本地查询)。
(2)Lookup 状态,进入此状态后,会在 hash 表中查找数据,若找到,则进入 Hit 状态,否则进
入 miss 状态。
(3)Pass 状态,在此状态下,会进入后端请求,即进入 fetch 状态。
(4)Fetch 状态,在 Fetch 状态下,对请求进行后端的获取,发送请求,获得数据,并进行本地
的存储。
(5)Deliver 状态, 将获取到的数据发送给客户端,然后完成本次请求。
virnish的安装和配置
(1)安装
[root@server60 kernel]# rpm -ivh varnish-libs-3.0.4-1.el6.x86_64.rpm
[root@server60 kernel]# rpm -ivh varnish-3.0.4-1.el6.x86_64.rpm
(2)配置
#配置单个后端服务器
[root@server60 kernel]# vim /etc/sysconfig/varnish
VARNISH_LISTEN_PORT=80 (配置varnish监听端口)
[root@server60 kernel]# vim /etc/varnish/default.vcl
backend default {
.host = "192.168.122.160";
.port = "8080";
} (配置一个后端服务器)
[root@server60 kernel]# yum install httpd -y
[root@server60 kernel]# vim /etc/httpd/conf/httpd.conf
#Listen 12.34.56.78:80
Listen 8080 (配置apache监听端口)
[root@server60 kernel]# echo `hostname` > /var/www/html/index.html
[root@server60 kernel]# /etc/init.d/httpd start
[root@server60 kernel]# /etc/init.d/varnish start
[root@server60 kernel]# netstat -antple
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 0 10028 1501/varnishd
tcp 0 0 :::8080 :::* LISTEN 0 9967 1475/httpd
可查看到80和8080端口说明启动成功.
测试:访问192.168.122.160和执行curl -I server60.example.com能看到如下页面说明配置成功.
#查看缓存命中情况
[root@server60 kernel]# vim /etc/varnish/default.vcl
sub vcl_deliver {
if (obj.hits > 0) {
set resp.http.X-Cache = "HIT from westos cache";
}
else {
set resp.http.X-Cache = "MISS from westos cache";
}
return (deliver);
}
[root@server60 kernel]# /etc/init.d/varnish reload
测试:执行curl -I server60.example.com能看到如下页面说明配置成功.
上图为无命中
上图为命中
#通过 varnishadm 手动清除缓存
# varnishadm ban.url .*$ #清除所有
# varnishadm ban.url /index.html #清除 index.html 页面缓存
# varnishadm ban.url /admin/$ #清除 admin 目录缓存
#配置多个不同域名站点的后端服务器
以下步骤在server60上实施:
[root@server60 ~]# vim /etc/varnish/default.vcl
backend server60 {
.host = "192.168.122.160";
.port = "8080";
}
backend server54 {
.host = "192.168.122.154";
.port = "80";
}
sub vcl_recv {
if (req.http.host ~ "^(www.)?westos.org") {
set req.http.host = "www.westos.org";
set req.backend =server60;
} elsif (req.http.host ~ "^bbs.westos.org") {
set req.backend = server54;
} else {
error 404 "westos cache";
}
}
#当访问 www.westos.org 域名时从 server60 上取数据,访问 bbs.westos.org 域名时到 server54 取数据, 访问其他页面报错。
[root@server60 ~]# echo www.westos.org > /var/www/html/index.html
[root@server60 ~]# /etc/init.d/httpd restart
[root@server60 ~]# /etc/init.d/varnish reload
以下步骤在server54上实施:
[root@server54 kernel]# yum install httpd -y
[root@server54 kernel]# echo bbs.westos.org > /var/www/html/index.html
[root@server54 kernel]# /etc/init.d/httpd start
测试:
注:在访问的那台机子上/etc/hosts里要写上解析:
192.168.122.160 www.westos.org bbs.westos.org
访问www.westos.org和执行curl -I www.westos.org可看到如下页面说明成功.
访问bbs.westos.org和执行curl -I bbs.westos.org可看到如下页面说明成功.
#负载均衡
以下步骤在server54上实施:
[root@server54 ~]# vim /etc/httpd/conf/httpd.conf
NameVirtualHost *:80 (去掉注释)
<VirtualHost *:80>
DocumentRoot /var/www/html
ServerName bbs.westos.org
</VirtualHost>
<VirtualHost *:80>
DocumentRoot /var/www/westos.org
ServerName www.westos.org
</VirtualHost>
[root@server54 ~]# echo bbs.westos.org > /var/www/html/index.html
[root@server54 ~]# mkdir /var/www/westos.org
[root@server54 ~]# echo www2.westos.org > /var/www/westos.org/index.html
[root@server54 ~]# /etc/init.d/httpd restart
以下步骤在server60上实施:
[root@server60 ~]# vim /etc/varnish/default.vcl
backend server60 {
.host = "192.168.122.160";
.port = "8080";
}
backend server54 {
.host = "192.168.122.154";
.port = "80";
}
director lb round-robin {
{ .backend = server60; }
{ .backend = server54; }
}
sub vcl_recv {
if (req.http.host ~ "^(www.)?westos.org") {
set req.http.host = "www.westos.org";
set req.backend = lb;
return (pass);
} elsif (req.http.host ~ "^bbs.westos.org") {
set req.backend = server54;
} else {
error 404 "westos cache";
}
}
[root@server60 ~]# echo www1.westos.org > /var/www/html/index.html
[root@server60 ~]# /etc/init.d/varnish reload
测试:
分别访问bbs.westos.org和www.westos.org
若访问bbs.westos.org出现如下页面,访问www.westos.org页面在www1.westos.org和www2.westos.org之前切换说明配置成功
#varnish cdn 推送平台
以下步骤在desktop36上实施:
[root@desktop36 ~]# yum install httpd php -y
[root@desktop36 ~]# unzip bansys.zip -d /var/www/html/
[root@desktop36 ~]# cd /var/www/html/
[root@desktop36 html]# cp -r bansys/* /var/www/html/
[root@desktop36 html]# vim config.php
///////////////////////数据库信息/////////////////////////
//数据库信息
/* $host = "localhost";
$user = "";
$passwd = "";
$dbname = "bansys";
$conn = mysql_connect($host, $user, $passwd) or die('Unable to connect database...');
mysql_select_db($dbname,$conn);
$query = "select ResourceIP from purgeapp_resource";
$results = mysql_query($query,$conn);
while ($row=mysql_fetch_row($results)) {
$varnish_host[] = $row[0];
}
mysql_close($conn);*/
////////////////////////////////////////////////////////
//varnish主机列表
//可定义多个主机列表
$var_group1 = array(
'host' => array('192.168.122.160'), (varnish所在主机的ip)
'port' => '6082',(与varnish所在主机的/etc/sysconfig/varnish中的VARNISH_ADMIN_LISTEN_PORT所对应的端口一致)
);
//这个使用了mysql读取数据 /* $var_group3 = array(
'host' => $varnish_host,
'port' => '6082',
);*/
//varnish群组定义
//对主机列表进行绑定
$VAR_CLUSTER = array(
// 'cdn.hit008.com' => $var_group3,
'www.westos.org' => $var_group1,
);
//varnish版本
//2.x和3.x推送命令不一样
$VAR_VERSION = "3"; (根据你所用varnish的版本设定)
以下步骤在server60上实施:
#bansys 有两种工作模式,分别是:telnet 和 http 模式。
#telnet 模式需要关闭 varnish 服务管理端口的验证,注释掉/etc/sysconfig/varnish 文件中的“-S $ {VARNISH_SECRET_FILE}”这行,重启 varnish 服务即可。
#如果是 http 模式需要对 varnish 做以下设置:
[root@server60 ~]# vim /etc/varnish/default.vcl
acl westos {
"127.0.0.1";
"192.168.122.0"/24;
}
sub vcl_recv {
if (req.http.host ~ "^(www.)?westos.org") {
set req.http.host = "www.westos.org";
set req.backend = lb;
# return (pass);
} elsif (req.http.host ~ "^bbs.westos.org") {
set req.backend = server54;
} else {
error 404 "westos cache";
}
if(req.request == "BAN") {
if (!client.ip ~ westos) {
error 405 "Not allowed.";
}
ban("req.url ~ " + req.url);
error 200 "ban added";
}
}
[root@server60 ~]# /etc/init.d/varnish reload
测试:
先访问下www.westos.org,然后按下图设置推送一次.
刷新下页面,若网页变成另一台机子上的页面,或者执行curl -I www.westos.org推送后X-Cache从HIT from westos cache变成 MISS from westos cache则说明推送成功.