nginx: [error] open() "/usr/local/nginx/logs/nginx.pid" failed (2: No such file or directory)

执行这个

/usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/nginx.conf

如果执行了报错

[root@nginx-master ~]# /usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/nginx.conf
nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
nginx: [emerg] still could not bind()

报了以上错，查了好久的资料，说什么端口被占用，杀死进程什么的，但是压根都看不到进程和端口占用，最后查出真相是nginx.conf配置问题，把下面这段配置删除就可以了

http {
    # ...
    map $http_upgrade $connection_upgrade {
        default Upgrade;
        ''      close;
    }

    server {
        # websockets
        location / {         
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection $connection_upgrade;
            # 这里将允许您在 Rancher UI 中打开命令行窗口时，窗口可以保留最多15分钟。没有这个参数时，默认值为1分钟，一分钟后在Rancher中的shell会自动关闭。
            proxy_read_timeout 900s;
            proxy_buffering off;
        }
    }
}

修改后的配置

worker_processes  4;
worker_rlimit_nofile 40000;

events {
    worker_connections  8192;
}

stream {
    upstream rancher_servers_http {
        least_conn;
        server 192.168.30.80:8080 max_fails=3 fail_timeout=5s;
        #server 192.168.30.51:80 max_fails=3 fail_timeout=5s;
    }
    server {
        listen     80;
        proxy_pass rancher_servers_http;
    }

    upstream rancher_servers_https {
        least_conn;
        server 192.168.30.80:8443 max_fails=3 fail_timeout=5s;
        #server 192.168.30.51:443 max_fails=3 fail_timeout=5s;
    }

    server {
        listen     443;
        proxy_pass rancher_servers_https;
    }
}