Varnish代替Squid

1、创建www用户和组,以及Varnish缓存文件存放目录(/var/vcache):

/usr/sbin/groupadd www -g 48
/usr/sbin/useradd -u 48 -g www www
mkdir -p /var/vcache
chmod +w /var/vcache
chown -R www:www /var/vcache


2、创建Varnish日志目录(/var/logs/):

mkdir -p /var/logs
chmod +w /var/logs
chown -R www:www /var/logs

 

3、编译安装varnish:

wget http://blog.s135.com/soft/linux/varnish/varnish-1.1.2.tar.gz
tar zxvf varnish-1.1.2.tar.gz
cd varnish-1.1.2
./configure --prefix=/usr/local/varnish
make && make install

 

 4、创建Varnish配置文件:

vi /usr/local/varnish/vcl.conf

backend myblogserver { 
       set backend.host = "192.168.0.5"; 
       set backend.port = "80"; 
}

acl purge {
       "localhost";
       "127.0.0.1";
       "192.168.1.0"/24;
}

sub vcl_recv {
       if (req.request == "PURGE") {
               if (!client.ip ~ purge) {
                       error 405 "Not allowed.";
               }
               lookup;
       }

       if (req.http.host ~ "^blog.s135.com") {
               set req.backend = myblogserver; 
               if (req.request != "GET" && req.request != "HEAD") {
                       pipe;
               }
               else {
                       lookup;
               }
       }
       else {
               error 404 "Alvin.zeng Cache Server"; 
               lookup;
       }
}

sub vcl_hit {
       if (req.request == "PURGE") {
               set obj.ttl = 0s;
               error 200 "Purged.";
       }
}

sub vcl_miss {
       if (req.request == "PURGE") {
               error 404 "Not in cache.";
       }
}

sub vcl_fetch {
       if (req.request == "GET" && req.url ~ "\.(txt|js)$") {
               set obj.ttl = 3600s;
       }
       else {
               set obj.ttl = 30d;
       }
}

 

解释以上配置文件:
  (1)、Varnish通过反向代理请求后端IP为192.168.0.5,端口为80的web服务器;
  (2)、Varnish允许localhost、127.0.0.1、192.168.0.***三个来源IP通过PURGE方法清除缓存;
  (3)、Varnish对域名为blog.s135.com的请求进行处理,非blog.s135.com域名的请求则返回“Alvin.zeng Cache Server”;
  (4)、Varnish对HTTP协议中的GET、HEAD请求进行缓存,对POST请求透过,让其直接访问后端Web服务器。之所以这样配置,是因为POST请求一般是发送数据给服务器的,需要服务器接收、处理,所以不缓存;
  (5)、Varnish对以.txt和.js结尾的URL缓存时间设置1小时,对其他的URL缓存时间设置为30天。


5、启动Varnish

ulimit -SHn 51200

/usr/local/varnish/sbin/varnishd -n /var/vcache -f /usr/local/varnish/vcl.conf -a 0.0.0.0:80 -s file,/var/vcache/varnish_cache.data,1G -g www -u www -w 30000,51200,10 -T 127.0.0.1:3500 -p client_http11=on

报错方式二:
varnishd -n /usr/local/services/varnish/var/varnish/test-1/ -f /usr/local/services/varnish/vcl.conf -a 0.0.0.0:80 -s file,/opt/vcahce/varnish_cache.data,1G -g www -u www -w 30000,51200,10 -T 127.0.0.1:3500 -p client_http11=on

 

6、启动varnishncsa用来将Varnish访问日志写入日志文件:

/usr/local/varnish/bin/varnishncsa -n /var/vcache -w /var/logs/varnish.log &


7、配置开机自动启动Varnish

vi /etc/rc.local

ulimit -SHn 51200
/usr/local/varnish/sbin/varnishd -n /var/vcache -f /usr/local/varnish/vcl.conf -a 0.0.0.0:80 -s file,/var/vcache/varnish_cache.data,1G -g www -u www -w 30000,51200,10 -T 127.0.0.1:3500 -p client_http11=on
/usr/local/varnish/bin/varnishncsa -n /var/vcache -w /var/logs/youvideo.log &

 

8、查看Varnish服务器连接数与命中率:

/usr/local/varnish/bin/varnishstat


9、通过Varnish管理端口进行管理:
  用help看看可以使用哪些Varnish命令:

/usr/local/varnish/bin/varnishadm -T 127.0.0.1:3500 help

 

说明其它:
TCP连接数Varnish要比Squid少,因为Varnish的TCP连接释放要比Squid快。

但同时处理的请求数Varnish要比Squid高一些,,Varnish实时处理的请求数比Squid多1倍,平均处理的请求数也比Squid多100余个:

/usr/local/webserver/varnish/bin/varnishstat
-----------------------------------------------------------
   70979868       580.97       356.55 Client requests received
   70897998       580.97       356.14 Cache hits

/usr/local/squid/bin/squidclient -p 80 mgr:5min
-----------------------------------------------------------
client_http.requests = 248.425264/sec
client_http.hits = 245.135282/sec


如果正常的话,vcache这个目录里只有一个大小为1G的文件:varnish_cache.data

 

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