nginx使用map配置AB测试环境

# underscores_in_headers on;
#当使用超过一个map时，下面两个参数需要调大，否则会报错
map_hash_max_size 262144;
map_hash_bucket_size 262144;

#定义3个upstream用于AB测试，用于显示不同的内容，相应下面有建3个虚拟主机端口与此对应
upstream def {
        server 127.0.0.1:8080;
}

upstream a {
        server 127.0.0.1:8081;
}

upstream b {
        server 127.0.0.1:8082;
}

# 定义map，$cookie_aid是指从cookie内取aid的值,当cookie内aid的值为"12345"时，$upserver为a，$upserver我这边是用的是upstrem的名称，其它类似
map $cookie_aid $upserver {
        default                          "def";
        "12345"                          "a";
        "67890"                          "b";
}
# 从$http_pid内取值,是从http header内取pid的的值,当http header内pid的值为"12345"时，$headerpid 为a，其它类似
map $http_pid $headerpid {
        default                          "def";
        "12345"                          "a";
        "67890"                          "b";
}
# 从$host内取值,$host对应的是用户访问的域名,当域名的值为12345.abtest-b.xxxxx.com时，$bserver 为a，其它类似
map $host $bserver {
		12345.abtest-b.xxxxx.com       "a";
		67890.abtest-b.xxxxx.com       "b";
		.abtest-b.xxxxx.com            "def";
		default                        "def";
}
# 从$arg_userid内取值,$arg_userid对应的是用户访问的URL上所带的参数userid的值,当userid的值为12345时，$userid为a，其它类似
map $arg_userid $userid {
        default                          "def";
        "12345"                          "a";
        "67890"                          "b";
}

server {
        listen 80;
        server_name abtest.xxxxx.com;
        charset utf-8;
        root /data/www/a/;
        access_log /data/log/nginx/abtest.internal.weimobdev.com_access.log main;
        error_log /data/log/nginx/abtest.internal.weimobdev.com_error.log info;

        location / {
                # 通过以下的if语句,实现多个变量的判断,当cookie内取aid的值判断完后，再判断http header内pid的值
                if ( $upserver = "def" ) {
                         set $upserver  $headerpid;
                }
                # 由于$upserver我这边是用的是upstrem的名称,所以可以直接转发
                proxy_pass http://$upserver;   
        }
}

server {
        listen 80;
        server_name abtest-b.xxxxx.com *.abtest-b.xxxxx.com;
        charset utf-8;
        root /data/www/a/;
        access_log /data/log/nginx/abtest-b.xxxxx.com_access.log main;
        error_log /data/log/nginx/abtest-b.xxxxx.com_error.log info;

        location / {
                # 通过以下的if语句,实现多个变量的判断,当$host内的域名判断完后，再判断URL上所带的参数userid的值
                if ( $bserver = "def" ) {
                         set $bserver $userid;
                }
                # 
                proxy_pass http://$bserver;
        }
}

server {
        listen 8080;
        charset utf-8;
        root /data/www/default/;
        access_log /data/log/nginx/default.log;
}

server {
        listen 8081;
        charset utf-8;
        root /data/www/a/;
        access_log /data/log/nginx/a.log;
}

server {
        listen 8082;
        charset utf-8;
        root /data/www/b/;
        access_log /data/log/nginx/b.log;
}