0?工作原理

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Session Sticky?模塊在upstream?返回響應后，向客戶的瀏覽器寫入?Cookie?，默認名為route?，保存的內容是一個?md5?碼。

之后，模塊接收到客戶瀏覽器的請求時，就根據?route?來決定將請求轉發到?upstream中哪臺服務器上。

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這是源碼包中附帶的流程圖，將模塊的處理流程描述的非常清晰：

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1?下載?Session Sticky

wget https://nginx-sticky-module.googlecode.com/files/nginx-sticky-module-1.1.tar.gz

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2?安裝模塊

如果?Nginx?之前已經安裝了，可以通過?nginx -V?命令查看當時編譯的參數。在參數后面追加安裝?Session Sticky?模塊的參數，

避免影響之前?Nginx?已有模塊。

進入?nginx?源碼目錄，執行命令：

./configure …? --add-module=/usr/local/src/nginx-sticky-module-1.1

?????????make

?????????make install

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3?激活模塊

在?upstream塊中添加?sticky;?即可激活Session Sticky模塊。

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upstream {

??sticky;

? server 127.0.0.1:9000;

? server 127.0.0.1:9001;

? server 127.0.0.1:9002;

}

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4?可用選項

The "sticky" command can take several arguments to control its behaviour:

? sticky [name=route] [domain=.foo.bar] [path=/] [expires=1h] [hash=index|md5|sha1] [no_fallback];

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Configuration	Description	Parameters	Default Value
name	the name of the cookie used to track the persistant upstream srv	can be any string	"route"
domain	the domain in which the cookie will be valid	can be any string	nothing. Let the browser handle this.
path	the path in which the cookie will? ?? ?be valid	can be any path	nothing. Let the browser handle this.
expires	the validity duration of the cookie	must be a duration greater than one second	nothing. It's a session cookie
hash	the hash mechanism to encode upstream server. It cant' be used? ?? ?with hmac	md5|sha1	md5
hmac	The HMAC hash mechanism to encode upstream server. It's like? ?? ?the hash mechanism but it uses hmac_key to secure the hashing.? ?? ?It can't be used with hash.	md5|sha1	none
hmac_key	The key to use with hmac. It's mandatory when hmac is set.	can be any string	none
no_fallback	When this flag is set, nginx will return a 502 (Bad Gateway orProxy Error) if a request comes? ?? ?with a cookie and the corresponding backend is unavailable.	no arguments	none

來源:https://blog.csdn.net/dc_726/article/details/12348907

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