使用Varnish代替Squid

  groupadd www
  groupadd www
  useradd  -g www www
  mkdir /var/cache
  mkdir /data/cache
  chown -R www:www /data/cache/
  mkdir -p /data/logs
  chmod +w /data/logs/
  chown -R www:www /data/logs/

tar -xzf varnish-2.0.4.tar.gz
cd varnish-2.0.4

  ./autogen.sh
  autoconf
 ./configure --prefix=/usr/local/varnish
   make
  make install
 cd /usr/local/varnish/etc/

 cd varnish/
 vi default.vcl

backend default {
.host = "127.0.0.1";
.port = "80";
}
sub vcl_recv {
    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);
    }
    return (lookup);
}

sub vcl_pipe {
    return (pipe);
}

sub vcl_pass {
    return (pass);
}

sub vcl_hash {
    set req.hash += req.url;
    if (req.http.host) {
        set req.hash += req.http.host;
    } else {
        set req.hash += server.ip;
    }
    return (hash);
}

sub vcl_hit {
    if (!obj.cacheable) {
        return (pass);
    }
    return (deliver);
}

sub vcl_miss {
    return (fetch);
}

sub vcl_fetch {
           if (req.request == "GET" && req.url ~ "\.(jpg|gif|png|css|js)$") {
               set obj.ttl = 3600s;
       }
       else {
               set obj.ttl = 3d;
       }
}

   # if (!obj.cacheable) {
   #     return (pass);
   # }
   # if (obj.http.Set-Cookie) {
   #     return (pass);
   # }
   # set obj.prefetch =  -30s;
   # return (deliver);

sub vcl_deliver {
    return (deliver);
}

sub vcl_discard {
    return (discard);
}

sub vcl_prefetch {
    return (fetch);
}

sub vcl_timeout {
    return (discard);
}
启动：
 /usr/local/varnish/sbin/varnishd -n /data/cache/ -f /usr/local/varnish/etc/varnish/default.vcl -a 0.0.0.0:80 -s file,/data/cache/varnish_cache.data,100M -g www -u www -w 300,512,10 -T 127.0.0.1:3500 -p client_http11=on
创建日志

/usr/local/varnish/bin/varnishncsa -n /data/cache/ -w /data/logs/varnish.log &

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、优化Linux内核参数

vi /etc/sysctl.conf

　　在末尾增加以下内容：

引用

net.ipv4.tcp_fin_timeout = 30
net.ipv4.tcp_keepalive_time = 300
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.ip_local_port_range = 5000    65000

---

   下面是引用张宴的博客
　　再看看如何管理Varnish：
　　1、查看Varnish服务器连接数与命中率：

/usr/local/varnish/bin/varnishstat

　　

　　2、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

引用

Available commands:
ping [timestamp]
status
start
stop
stats
vcl.load
vcl.inline
vcl.use
vcl.discard
vcl.list
vcl.show
param.show [-l] []
param.set
help [command]
url.purge
dump.pool

　　3、通过Varnish管理端口，使用正则表达式批量清除缓存：
　　(1)、例：清除类似http://blog.s135.com/a/zhangyan.html的URL地址）：

/usr/local/varnish/bin/varnishadm -T 127.0.0.1:3500 url.purge /a/

　　(2)、例：清除类似http://blog.s135.com/tech的URL地址：

/usr/local/varnish/bin/varnishadm -T 127.0.0.1:3500 url.purge w*$

　　(3)、例：清除所有缓存：

/usr/local/varnish/bin/varnishadm -T 127.0.0.1:3500 url.purge *$

　　4、一个清除Squid缓存的PHP函数（清除Varnish缓存同样可以使用该函数，无需作任何修改，十分方便）：

function purge($ip, $url)
{
    $errstr = '';
    $errno = '';
    $fp = fsockopen ($ip, 80, $errno, $errstr, 2);
    if (!$fp)
    {
         return false;
    }
    else
    {
        $out = "PURGE $url HTTP/1.1\r\n";
        $out .= "Host:blog.s135.com\r\n";
        $out .= "Connection: close\r\n\r\n";
        fputs ($fp, $out);
        $out = fgets($fp , 4096);
        fclose ($fp);
        return true;
    }
}

purge("192.168.0.4", "/index.php");
?>

<?php function purge($ip, $url) {    $errstr = '';    $errno = '';    $fp = fsockopen ($ip, 80, $errno, $errstr, 2);    if (!$fp)    {         return false;    }    else    {        $out = "PURGE $url HTTP/1.1\r\n";        $out .= "Host:blog.s135.com\r\n";        $out .= "Connection: close\r\n\r\n";        fputs ($fp, $out);        $out = fgets($fp , 4096);        fclose ($fp);        return true;    } } purge("192.168.0.4", "/index.php"); ?>

　　附1：Varnish官方网站：

　　附2：2007年12月10日，我写了一个每天0点运行，按天切割Varnish日志，生成一个压缩文件，同时删除上个月旧日志的脚本（/var/logs/cutlog.sh）：
　　/var/logs/cutlog.sh文件内容如下：

引用

#!/bin/sh
# This file run at 00:00
date=$(date -d "yesterday" +"%Y-%m-%d")
pkill -9 varnishncsa
mv /var/logs/youvideo.log /var/logs/${date}.log
/usr/local/varnish/bin/varnishncsa -n /var/vcache -w /var/logs/youvideo.log &
mkdir -p /var/logs/youvideo/
gzip -c /var/logs/${date}.log > /var/logs/youvideo/${date}.log.gz
rm -f /var/logs/${date}.log
rm -f /var/logs/youvideo/$(date -d "-1 month" +"%Y-%m*").log.gz

　　设置在每天00:00定时执行：
　　

/usr/bin/crontab -e

　　或者　　

vi /var/spool/cron/root

　　输入以下内容：

引用

0 0 * * * /bin/sh /var/logs/cutlog.sh

参考：http://blog.s135.com/post/313/