三台Nginx两台服务器测试
交换机将【这里用一台nginx模拟代替】请求分发到两台Nginx，Nginx1和Nginx2，有两台后台服务器（Resin1、Resin2<backup>），一台通过Nginx1、Nginx2的UpStream配置为应急使用。
Resin1服务正常情况下，Nginx1和Nginx2将前置Nginx分发的请求代理到Resin1服务器
当Resin1服务出现异常后，Resin2开始服务。
测试url:
http://192.168.36.68:11821/webapi/Login?IMSI=4000B8000&Timestamp=1328860667915
后台服务器状态：
1. 51后台服务运行
a) 68Nginx日志
[10/Feb/2012:16:36:16 +0800] - 192.168.36.51:11821 - 200 -- [0.055] --- /webapi/Login?IMSI=4000B8000&Timestamp=1328860667915
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[10/Feb/2012:16:47:20 +0800] - 192.168.36.59:11821 - 200 -- [1.663] --- /webapi/Login?IMSI=4000B8000&Timestamp=1328860667915
b) 51Nginx日志
[10/Feb/2012:16:36:16 +0800] - 192.168.36.51:8091, 192.168.36.59:8091 - 502, 200 -- [0.000, 0.055] --- /webapi/Login?IMSI=4000B8000&Timestamp=1328860667915
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c) 59Nginx日志
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[10/Feb/2012:16:47:24 +0800] - 192.168.36.51:8091 - 200 -- [1.662] --- /webapi/Login?IMSI=4000B8000&Timestamp=1328860667915
2. 51后台服务关闭
a) 68Nginx日志
[10/Feb/2012:16:44:58 +0800] - 192.168.36.51:11821 - 200 -- [2.827] --- /webapi/Login?IMSI=4000B8000&Timestamp=1328860667915
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[10/Feb/2012:16:49:07 +0800] - 192.168.36.59:11821 - 200 -- [0.054] --- /webapi/Login?IMSI=4000B8000&Timestamp=1328860667915
b) 51Nginx日志
[10/Feb/2012:16:44:58 +0800] - 192.168.36.51:8091 - 200 -- [2.826] --- /webapi/Login?IMSI=4000B8000&Timestamp=1328860667915
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c) 59Nginx日志
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[10/Feb/2012:16:49:12 +0800] - 192.168.36.51:8091, 192.168.36.59:8091 - 502, 200 -- [0.000, 0.053] --- /webapi/Login?IMSI=4000B8000&Timestamp=1328860667915