如题

host not found in upstream

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C:\nginx-1.12.0>nginx -t
nginx: [emerg] host not found in upstream "p.weblb.com:8180" in C:\nginx-1.12.0/conf/../vhosts/crm.web.load.balance.conf:3
nginx: configuration file C:\nginx-1.12.0/conf/nginx.conf test failed

C:\nginx-1.12.0>nginx -t
nginx: [emerg] host not found in upstream "p.rate.com" in C:\nginx-1.12.0/conf/../vhosts/tb.conf:26
nginx: configuration file C:\nginx-1.12.0/conf/nginx.conf test failed

  • 上面两个错误的原因，是域名解析失败，在 hosts 文件添加这两个域名即可

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    127.0.0.1 p.weblb.com
    127.0.0.1 p.rate.com

  • 附：配置文件 crm.web.load.balance.conf

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    upstream crm-webs {
        ip_hash;
        server p.weblb.com:8180 weight=5 max_fails=1 fail_timeout=180;
        #server p.javaweb.com:18081 weight=1 max_fails=1 fail_timeout=180;
        #server p.javaweb.com:18082 backup;
    }

    server {
            access_log   logs/crm.web.access.log;
            error_log    logs/crm.web.error.log;
            listen       81;
            server_name  p.weblb.com;

            location / {
                proxy_pass http://crm-webs;
                proxy_set_header  Host                  $host;
                proxy_set_header  X-Real-IP             $remote_addr;
                proxy_set_header  X-Forwarded-For       $proxy_add_x_forwarded_for;
            }
     }

  • 附：配置文件 tb.conf

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    server {
        listen       80;
        server_name  p.tb.com;
        charset utf-8;
        access_log  logs/p.tb.com.access.log;
        error_log   logs/p.tb.com.error.log;
        root c:/dev.workspace/php/tb/trunk/web/;
        index index.php;
        
        location ~ \.php$ {
            fastcgi_pass   127.0.0.1:9000;
            fastcgi_index  index.php;
            fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
            include        fastcgi_params;
            fastcgi_read_timeout  1d;            #新增，xdebug调试时长
        }
        
        location / {
            if (!-e $request_filename) {
                rewrite  ^(.*)$  /index.php  last;
                break;
            }
        }

        #rate 是另外一个项目，独立部署，这里通过代理访问
        location ^~ /rate {
            proxy_pass   http://p.rate.com;
            proxy_redirect  http://p.rate.com/ http://d5.51fakd.com/rate/; 
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        }
        
        #crm 是 java web 应用，通过代理直接访问，并且代理做了负载均衡
        location ^~ /crm {
            proxy_pass http://p.weblb.com:8180/crm;
            proxy_redirect  http://p.weblb.com:8180/crm/ http://tb.qn.com/crm/; 
            
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        }  
    }

  • 用 nginx 反向代理达到访问 tomcat 的默认端口应用程序时，域名不加端口 8080，对外就象是使用默认的 80 端口一样

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    server {
        listen       80;
        server_name  myjira.com;
        charset      utf-8;
        access_log   /opt/atlassian/jira/logs/ybdjira.com.access.log;
        error_log    /opt/atlassian/jira/logs/ybdjira.com.error.log;

        location / {
            proxy_pass        http://localhost:8080;
            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 这句配置是改变 http 的请求头。而 Host 是请求的主机名，X-Real-IP 是请求的真实 IP，X-Forwarded-For 表示请求是由谁发起的。
如果不需要获取真实 IP 的业务时，仅需要如下简单配置即可：

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server {
    listen       80;
    server_name  myjira.com;
    charset      utf-8;
    access_log   /opt/atlassian/jira/logs/ybdjira.com.access.log;
    error_log    /opt/atlassian/jira/logs/ybdjira.com.error.log;
        
    location / {
        proxy_pass http://localhost:8080;
    }
}