nginx根据cookie分流

nginx根据cookie分流
众所周知，nginx可以根据url path进行分流，殊不知对于cookie分流也很强大，同时这也是我上篇提到的小流量实验的基础。

二话不说，先看需求，两台服务器分别定义为
apache001：192.168.1.1:8080
apache002：192.168.1.2:8080

默认服务器为：
default：192.168.1.0:8080

前端nginx服务器监听端口8080，需要根据cookie转发，查询的cookie的键（key）为abcdexpid，如果该cookie值（value）以1结尾则转发到apache001，以2结尾则转发到apache002。

方案1：
用map，nginx.conf配置如下：

map $COOKIE_abcdexpid $group {
~*1$ apache001;
~*2$ apache002;
default root;
}

upstream apache001 {
server 192.168.1.1:8080 weight=1 max_fails=1 fail_timeout=30s;
}

upstream apache002 {
server 192.168.1.2:8080 weight=1 max_fails=1 fail_timeout=30s;
}

upstream root {
server 192.168.1.0:8080 weight=1 max_fails=1 fail_timeout=30s;
}

server {
listen 8080;
server_name neoremind.net;

log_format main '$remote_addr - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent "$http_referer" "group=$group"'
'"$http_user_agent" $gzip_ratio $request_time "$http_x_forwarded_for"';

access_log logs/access_log main;
error_log logs/error_log;

location / {
proxy_pass http://$group; proxy_set_header X-Forwarded-For $remote_addr;
}
}

方案2：
利用set和if…else… ，nginx.conf配置如下：

upstream apache001 {
server 192.168.1.1:8080 weight=1 max_fails=1 fail_timeout=30s;
}

upstream apache002 {
server 192.168.1.2:8080 weight=1 max_fails=1 fail_timeout=30s;
}

upstream root {
server 192.168.1.0:8080 weight=1 max_fails=1 fail_timeout=30s;
}

server {
listen 8080;
server_name beidoutest.baidu.com;

#match cookie
set $group "root";
if ($http_cookie ~* "abcdexpid=([^;]+)(1$)"){
set $group apache001;
}
if ($http_cookie ~* "abcdexpid=([^;]+)(2$)"){
set $group apache002;
}

log_format main '$remote_addr - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent "$http_referer" "group=$group"'
'"$http_user_agent" $gzip_ratio $request_time "$http_x_forwarded_for"';

access_log logs/access_log main;
error_log logs/error_log;

location / {
proxy_pass http://$group; proxy_set_header X-Forwarded-For $remote_addr;
}

}