詳解CentOS 5.8下varnish-2.1.5的安裝配置

Varnish是一款強大的反向 Proxy加速軟體，關於其工作原理可以參考上圖，其具體流程及VCL文法我這裡就不做說明，網上資料多，大家還可以對照參考其官方網站和《Varnish中文權威指南》。

一、安裝CentOS5.8系統內容下的依耐關係

yum install gcc gcc-c++

yum install automake autoconflibtool ncurses-devel libxslt groff pcre-devel pkgconfig libtool -y

二、下載varnish-2.1.5源碼包，並進行編譯安裝。

cd /usr/local/src

wget  http://repo.varnish-cache.org/source/varnish-2.1.5.tar.gz

tar zxvf varnish-2.1.5.tar.gz

cd varnish-2.1.5.

./autogen.sh

#autogen.sh命令是用來檢查軟體的依耐關係是否滿足，如果報錯的話， 則應該如下

正常所示：

+ aclocal

+ libtoolize --copy --force

+ autoheader

+ automake --add-missing --copy --foreign

+ autoconf

繼續編譯安裝：

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

make && make install && cd ../

三、建立varnish使用者和組，以及varnish快取檔案和日誌存放目錄：

/usr/sbin/groupadd varnish

/usr/sbin/useradd -s /sbin/nologin  -g varnish varnish

mkdir -p /data/varnish/{cache,log}

chown  -R varnish:varnish /data/varnish/{cache,log}

四、我的測試環境是兩台Web機器，IP為192.168.1.103（網域名稱為http://www.yuhongchun027.net）的varnish機器對後端IP為192.168.1.104和192.168.1.105的機器進行反向 Proxy加速，其設定檔/usr/local/varnish/etc/varnish/better.vcl如下所示：

backend rserver1{.host ="192.168.1.104";.port = "80";.probe = {.timeout = 5s;          #等待多長時間逾時.interval = 2s;          #檢查時間間隔.window = 10;         #varnish將維持10個sliding windows的結果.threshold = 8;         #如果是8次.windows檢查是成功的，就宣告後端的Web機器是健康的}}backend rserver2{.host ="192.168.1.105";.port = "80";.probe = {.timeout = 5s;    .interval = 2s;   .window = 10;     .threshold = 8;}}#指定一個名為realserver組，使用random機制，權重越大，分配的訪問越多，可根據伺服器效能來設定；而round-robin（輪詢）機制是不能指定weight的director realserver random {{.backend = rserver1;.weight = 5;}{.backend = rserver2;.weight = 6;}}#定義能清理緩衝的機器，這裡只允許本機能用purge的方式清理acl purge {"localhost";"127.0.0.1";}sub vcl_recv{  if (req.http.host ~"^(.*).yuhongchun027.net")  {          set req.backend =realserver;   }       else     {            error 200 "Nocahce for this domain";      }                  if (req.request =="PURGE")         {                   if (!client.ip ~purge)             {                           error 405"Not allowed.";                     }          else             {                return (pipe);             }}#擷取用戶端真實IP地址if(req.http.x-forwarded-for){         set req.http.X-Forwarded-For =        req.http.X-Forwarded-For "," client.ip;}else{           set req.http.X-Forwarded-For =client.ip;       }#對HTTP協議中的GET、HEAD請求進行緩衝，對POST請求透過，讓其直接存取後端Web伺服器。之所以這樣配置，是因為POST請求一般是發送資料給伺服器的，需要伺服器接收、處理，所以不緩衝；if (req.request !="GET" && req.request != "HEAD"){        return (pipe);}if (req.http.Expect){       return (pipe);}if (req.http.Authenticate|| req.http.Cookie){        return (pass);}if (req.http.Cache-Control~ "no-cache"){       return (pass);}#對JSP或者PHP檔案不緩衝if(req.url ~"\.jsp" || req.url ~ "\.php" ){        return (pass);}else{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 (req.request =="PURGE"){ set obj.ttl = 0s;      error 200"Purged.";}if (!obj.cacheable){  return (pass);}return (deliver);}sub vcl_miss{if (req.request =="PURGE"){  error 404 "Not incache.";}if (req.http.user-agent ~"spider"){   error 503 "Notpresently in cache";}     return (fetch);}sub vcl_fetch{if (req.request =="GET" && req.url ~ "\.(txt|js)$"){  set beresp.ttl = 3600s;}else{  set beresp.ttl = 30d;}if (!beresp.cacheable){  return (pass);}if (beresp.http.Set-Cookie){ return (pass);}return (deliver);}sub vcl_deliver { if (obj.hits > 0) {   set resp.http.X-Cache= "HIT  FROM www.yuhongchun027.net"; } else {   set resp.http.X-Cache= "MISS FROM www.yuhongchun027.net"; }return (deliver);}

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