Centos 5.6 安裝varnish

Centos 5.6 安裝varnish

環境

varnish 192.168.58.166

nginx1 192.168.58.130

nginx1 192.168.58.168

 

linux同步北京時間

ntpdate stdtime.sinica.edu.tw

建立運行用戶和目錄

useradd -s /sbin/nologin varnish

mkdir /data

mkdir /data/varnish

mkdir /data/varnish/cache

mkdir /data/varnish/log

chown -R varnish:varnish /data/varnish/cache/ /data/varnish/log/

安裝pcre

yum -y install pcre*

安裝varnish

wget http://pkgs.fedoraproject.org/repo/pkgs/varnish/varnish-2.1.2.tar.gz/8b0d80e47acf4946671c381af55518b9/varnish-2.1.2.tar.gz

tar zxvf varnish-2.1.2.tar.gz -C /usr/src/

cd /usr/src/varnish-2.1.2/

export PKG_CONFIG_PATH=/usr/lib/pkgconfig

./configure --prefix=/usr/local/varnish --enable-dependency-tracking --enable-debugging-symbols --enable-developer-warnings

make && make install

新建配置文件

cd /usr/local/varnish/etc

vi vcl.conf

 

backend webserver1 { 

 .host = "192.168.58.130"; 

 .port = "80"; 

} 

backend webserver2 { 

 .host = "192.168.58.168"; 

 .port = "80"; 

} 

#backend webserver3 {

# .host = "192.168.12.14";

# .port = "80";

#}

#backend webserver4 {

# .host = "192.168.12.15";

# .port = "80";

#}

#定義一個名爲webserver的director，也就是由webserver1和webserver2兩臺後端服務器隨機分擔 

#請求。「.weight」用來指定兩臺後端服務器的權值。權值高的處理請求的概率就高些 

director webserver random { 

 {.backend = webserver1; .weight = 5;  } 

 {.backend = webserver2; .weight = 8;  } 

} 

#這裏設定清理緩存的規則，Varnish容許localhost、127.0.0.1和192.168.58.***三個來源IP經過 

# PURGE方法清除緩存 

acl purge { 

 "localhost"; 

 "127.0.0.1"; 

 "192.168.58.0"/26; 

} 

sub vcl_recv { 

 

#這裏設定，當發送PURGE請求的客戶端不是在acl中設定的地址時，將返回405狀態代碼，提示 

#「Not allowed」。當請求的URL是以.php和.cgi結尾時，則交給後端服務器去處理 

 if (req.request == "PURGE") { 

     if (!client.ip ~ purge) { 

     error 405 "Not allowed."; 

   } 

     elseif(req.url ~ "\.(php|cgi)($|\?)") { 

     return (pass); 

   } 

     else { 

     return (lookup); 

   } 

 } 

 

#下面設定域名訪問策略，其實也是設定對後端主機健康狀態檢測的一個機制。若是訪問www.ixdba.net 

#或者bbs.ixdba.net，而且請求重啓次數爲0，則將請求交給webserver來處理。若是請求重啓次數 

#爲1，則將請求交給webserver1處理。若是訪問img.ixdba.net或者p_w_picpaths.ixdba.net，則將 

#請求交給webserver2來處理 

# if((req.http.host ~"^(www.|bbs.)?ixdba.net")&&(req.restarts == 0))  {

#     set req.backend = webserver;

# } elseif(req.restarts == 1) {

#     set req.backend = webserver1;

# }

# if(req.http.host ~"^(img.|p_w_picpaths.)?ixdba.net") {

#     set req.backend = webserver2;

# }

#上面註釋部分是基於域名的訪問策略，有域名的話，能夠採用上面的。由於沒有域名，因此下面是去除了域名的部分。

if (req.restarts == 0) {

set req.backend = webserver;

} else if(req.restarts == 1) {

set req.backend = webserver1;

} else if(req.restarts == 2) {

set req.backend = webserver2;

}

 

#下面定義緩存的策略。當請求以.cgi和.php結尾及帶有?的URL時，不進行緩存，直接從後端服務器 

#讀取內容。其餘請求都進入lookup模式，也就是進入cache中經過hash表尋找被請求的數據 

 if (req.request != "GET" && req.request != "HEAD") 

 { 

   return (pipe); 

 } 

 elseif (req.url ~ "\.(cgi|php)($|\?)") 

 { 

  return (pass); 

 } 

 elseif (req.http.Authenticate || req.http.Authorization) { 

   return (pass); 

 } 

 return (lookup); 

} 

 

#若是請求的類型是PURGE方法，Varnishd會將此請求的緩存週期設置爲0，也就是使這個URL的緩存失效， 

#從而達到刷新Varnish緩存的目的 

sub vcl_hit 

{ 

 if (req.request == "PURGE") { 

   set obj.ttl = 0s; 

   error 200 "Purged."; 

 } 

 

 if (!obj.cacheable) 

 { 

   return (pass); 

 } 

 

 if (obj.http.Vary) 

 { 

   unset obj.http.Vary; 

 } 

} 

 

sub vcl_miss 

{ 

 if (req.request == "PURGE") { 

   error 404 "Not in cache."; 

 } 

 

} 

#定義hash的值，而且處理壓縮內容 

sub vcl_hash { 

 set req.hash += req.url; 

 if (req.http.host) { 

   set req.hash += req.http.host; 

 } else { 

   set req.hash += server.ip; 

 } 

 if ( req.http.Accept-Encoding ){ 

   if (req.url ~ "\.(jpg|jpeg|png|gif|rar|zip|gz|tgz|bz2|tbz|mp3|ogg|swf|exe|flv|avi|rmvb|rm|mpg|mpeg|pdf)$") { 

   } else { 

       set req.hash += req.http.Accept-Encoding; 

   } 

 } 

 return (hash); 

} 

 

sub vcl_fetch 

{ 

    if (!beresp.cacheable) { 

          return (pass); 

    } 

 

    if (beresp.http.Set-Cookie) { 

            return (pass); 

    } 

 

#定義在什麼狀態下進入restart模式 

    if (beresp.status == 500 || beresp.status == 501 || beresp.status == 502 || beresp.status == 503 || beresp.status == 504 || beresp.status == 404) 

    { 

         return (restart); 

       } 

 

#下面定義不緩存含有哪些HTTP頭的請求 

     if (beresp.http.Pragma ~ "no-cache" || beresp.http.Cache-Control ~ "no-cache" || beresp.http.Cache-Control ~ "private") { 

          return (pass); 

 } 

 

#定義不一樣內容的緩存時間 

     if (req.request == "GET" && req.url ~ "\.(css|js|html|htm)$") { 

              set beresp.ttl = 300s; 

   } 

  if (req.request == "GET" && req.url ~ "\.(gif|jpg|jpeg|bmp|png|tiff|tif|ico|img|bmp|wmf)$") { 

       set beresp.ttl = 3600s; 

       } 

  if (req.request == "GET" && req.url ~ "\.(svg|swf|ico|mp3|mp4|m4a|wav|rmvb|avi|wmv)$") { 

       set beresp.ttl = 10d; 

       } 

return (deliver); 

 

} 

sub vcl_deliver { 

   if (obj.hits > 0) { 

      set resp.http.X-Cache = "HIT from www.xx.com"; 

   } else { 

     set resp.http.X-Cache = "MISS from www.xx.com"; 

   } 

   return (deliver); 

}

 

啓動varnish

/usr/local/varnish/sbin/varnishd -u varnish -g varnish -f /usr/local/varnish/etc/vcl.conf -a 192.168.58.166:80 -s file,/data/varnish/cache/varnish_cache.data,256MB -w 256,2560,10 -t 3600 -T 192.168.58.166:3000

查看端口

[root@ns1 etc]# netstat -napt | grep varnish

tcp        0      0 127.0.0.1:80                0.0.0.0:*                   LISTEN      22907/varnishd

tcp        0      0 127.0.0.1:3000              0.0.0.0:*                   LISTEN      22906/varnishd

在192.168.58.130上面修改網頁內容

vi /usr/local/nginx/html/index.html

 

 

<html>

<head>

<title>Welcome to nginx!</title>

</head>

<body bgcolor="white" text="black">

<center><h1>Welcome to nginx1!</h1></center>

</body>

</html>

 

192.168.58.168修改成Welcome to nginx2!

 

重啓nginx

/usr/local/nginx/sbin/nginx -s reload

 

 

客戶端訪問varnish

http://192.168.58.166/

 

關閉nginx1服務

/usr/local/nginx/sbin/nginx -s stop

等待一段時間

清楚緩存，再次訪問頁面，就看到nginx2