Nginx 这样配置，总是报 nginx: [emerg] unknown directive "127.0.0.1:8000"... 是哪里写错了呢？

本来的单机配置是这样的，访问正常：

http { include mime.types; default_type application/octet-stream; sendfile on; keepalive_timeout 65; server { listen 80; server_name my-domain.com; access_log /var/log/nginx/access.log; error_log /var/log/nginx/error.log; client_max_body_size 200M; location / { proxy_pass http://127.0.0.1:8000; proxy_redirect off; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header X-Forwarded-Host $server_name; } location /static/ { root /usr/local/nginx/project/; } } } 

为了增加负载均衡，然后我把上面的单机配置改成：upstream backend {...}，测一下就提示错误 nginx: [emerg] unknown directive "127.0.0.1:8000"

http { include mime.types; default_type application/octet-stream; sendfile on; keepalive_timeout 65; upstream backend { 127.0.0.1:8000; } server { listen 80; server_name my-domain.com; access_log /var/log/nginx/access.log; error_log /var/log/nginx/error.log; client_max_body_size 200M; location / { proxy_pass http://backend; proxy_redirect off; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header X-Forwarded-Host $server_name; } location /static/ { root /usr/local/nginx/project/; } } } 

服务器结构是 nginx + gunicorn + flask