redhat6.5系统lnmp架构varnish服务
实验主机：varnish 172.25.44.1server1 172.25.44.10
server2 172.25.44.20
简介：
varnish ： varnish是一款高性能的开源HTTP加速器。
实验环境：
主机的iptables处于off状态，setenforce 0
实验流程：
在server1和server2主机上：
yum install httpd -y
cd/var/www/html/
echo server1(2)\'s page > index.html
/etc/init.d/httpd start
浏览器访问主机IP172.25.44.10和172.25.44.20是否成功。
在varnish主机上：
yum installvarnish-3.0.5-1.el6.x86_64.rpm -y #从网上下载再安装
yum install varnish-libs-3.0.5-1.el6.x86_64.rpm -y #从网上下载再安装
vi /etc/sysconfig/varnish
VARNISH_LISTEN_PORT=80 #设定varnish的端口为80
vi /etc/varnish/default.vcl
backend server1 {
.host ="172.25.44.10" ; #指定apache所在的主机
.port = "80"; #apache端口
}
/etc/init.d/varnish start #启动varnish服务
netstat -antlpe #查看80端口是否开启成功
浏览器访问172.25.44.1 #显示的是server1主机的信息
vi /etc/varnish/default.vcl ##设定查看缓存信息
sub vcl_deliver {
if (obj.hits > 0) {
set resp.http.X-Cache = "HIT from varnish cache"; ##缓存命中
}
else {
set resp.http.X-Cache = "MISS from varnish cache"; ##缓存未命中
}
return (deliver);
}
/etc/init.d/varnish restart ##重启varnish服务
curl -I 172.25.44.30
#如果出现X-Cache : MISS from varnish cache则表示缓存未命中
#如果出现X-Cache : HIT from varnish cache 则表示缓存命中
【缓存无法同步问题】
缓存不过期页面无法刷新，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
【定义多个不同域名站点的后端服务器】
vi /etc/varnish/default.vcl
backend server1 {
.host = "172.25.44.20";
.port = "80";
}
backend westos {
.host = "172.25.44.10";
.port = "80";
}
sub vcl_recv { ##网页缓存
if (req.http.host ~ "^(www.)?westos.com") { ##访问中是否带www
set req.http.host = "www.westos.com"; 都定向到www上
set req.backend = westos; ##访问的主机
} elsif (req.http.host ~ "^(www.)?linux.com") { ##访问中是否带www都定向到www上
set req.http.host = "www.linux.com";
set req.backend = westos;
} else {error 404 "varnish cache";
}
}
/etc/init.d/varnish restart ##重启varnish服务
在server1主机上：
vi /etc/httpd/conf/httpd.conf
<VirtualHost *:80>
DocumentRoot /www/westos.com/html
ServerName www.westos.com
</VirtualHost>
<VirtualHost *:80>
DocumentRoot /www/linux.com/html
ServerName www.linux.com
</VirtualHost>
/etc/init.d/httpd restart
mkdir -p /www/westos.com/html
mkdir -p /www/linux.com/html
echo server1\'s www.westos.com > /www/westos.com/html/index.html
echo server1\'s www.linux.com > /www/linux.com/html/index.html
配置做完后在浏览器所在的真实主机上
vim /etc/hosts
172.25.44.1 www.westos.com
172.25.44.1 www.linux.com
172.25.44.1 server1.example.com
浏览器访问www.westos.com和www.linux.com
【负载均衡器】
在server2主机上配置好http的虚拟主机
配置和server1主机一样
在varnish主机上：
vi /etc/varnish/default.vcl
director westoslb round-robin {
{ .backend = server1; }
{ .backend = westos; }
}
sub vcl_recv {
if (req.http.host ~ "^(www.)?westos.org") {
set req.http.host = "www.westos.org";
set req.backend = westoslb;
return (pass); ##方便测试，不缓存
} elsif (req.http.host ~ "^(www.)?linux.com") {
set req.http.host = "www.linux.com";
set req.backend = westoslb;
}
elsif (req.http.host ~ "^server1.example.com" ){
set req.backend = server1;
}
else {error 404 "varnish cache";
}
}
/etc/init.d/varnish restart
浏览器访问网页，并且不断刷新
【varnish cdn推送平台】
在varnish主机上：
yum install httpd -y
vi /etc/httpd/conf/httpd.conf
Listen 8080 #修改http的端口为8080，因为varnish中使用的端口已经是80端口，如果不修改，则httpd服务起不来。
/etc/init.d/httpd start
yum install unzip
unzip bansys.zip -d /var/www/html #从网上下载获得
yum install php -y
# vi /var/www/html/bansys/config.php #只保留如下设置,其余注释掉
<?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;
# }
# #mysql_close($conn);
////////////////////////////////////////////////////////
//varnish主机列表
//可定义多个主机列表
$var_group1 = array(
'host' => array('172.25.44.1'),
'port' => '6082',
);
//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(
'www.westos.com' => $var_group1,
);
//varnish版本
//2.x和3.x推送命令不一样
$VAR_VERSION = "3";
?>
vi /etc/varnish/default.vcl
acl bansys {
"172.25.44.1";
"172.25.44.0"/24;
}
sub vcl_recv {
if (req.request == "BAN") {
if (!client.ip ~ bansys) {
error 405 "Not allowed.";
}
ban("req.url ~ " + req.url);
error 200 "ban added";
}
if (req.http.host ~ "^(www.)?westos.com") {
set req.http.host = "www.westos.com";
set req.backend = westoslb;
#return (pass);
} elsif (req.http.host ~ "^(www.)?linux.com") {
set req.http.host = "www.linux.com";
set req.backend = westoslb;
}
elsif (req.http.host ~ "^server1.example.com" ){
set req.backend = server1;
}
else {error 404 "varnish cache";
}
}
/etc/init.d/httpd restart
/etc/init.d/varnish restart
在浏览器的真实主机上：
curl -I http://www.westos.com/index.html
#如果出现X-Cache : MISS from varnish cache则表示缓存未命中
#如果出现X-Cache : HIT from varnish cache 则表示缓存命中
访问172.25.44.1/bansys
cdn进行推送刷新缓存
curl -I http://www.westos.com/index.html
#缓存刷新成功后为MISS
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