问题
nginx通过域名反向代理负载到两个数据中心的服务上,且后端取到的ip地址为代理的这两个ip地址:
1、设置HOST为proxy_set_header Host $proxy_host; 时,proxy_pass只能写单数据中心的域名,不能写upstream形式(实测写到upstream里会报错404,HOST好像无法传递到upstream里),无法满足多中心负载。
server { listen 80; server_name www.xyz.com; location / { proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header X-Real-IP $remote_addr; proxy_set_header Host $proxy_host; proxy_pass http://dc1.abc.com; } } 或=================》 server { listen 80; server_name www.xyz.com; location / { proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header X-Real-IP $remote_addr; proxy_set_header Host $proxy_host; proxy_pass http://dc2.abc.com; } }
2、期望是以下配置可以正常访问:
upstream pp{ server dc1.abc.com; server dc2.abc.com; } server { listen 80; server_name www.xyz.com; location / { proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header X-Real-IP $remote_addr; proxy_set_header Host $proxy_host; proxy_pass http://pp; } }
疑问?
nginx upstream可以根据域名进行负载均衡吗?设置了Host $proxy_host只能满足非upstream访问
请教如何把$proxy_host 传递到upstream里,然后根据upstream配置的不同的server设置不同的HOST?
比如:www.xyz.com转发到upstream里的dc1.abc.com时,传递header的HOST为dc1.abc.com;
www.xyz.com转发到upstream里的dc2.abc.com时,传递header的HOST为dc2.abc.com;
请问如何实现呢
回答
参考使用了map函数之后取的值为空!发现不行,原因是 proxy_set_headeris executed beforeproxy_passeven if you put it afterproxy_pass, and before entering load balancing, $upstream_addr is null
作者:OK兄 浏览次数:26