Nginx服务启动失败

今天想要启动nginx服务时,发现起不起来。
# systemctl start nginx
Job for nginx.service failed because the control process exited with error code. See "systemctl status nginx.service" and "journalctl -xe" for details.

我想着是不是我的防火墙没关,但是我现在并不需要去访问这台主机,所以它应该是可以启动的啊。getenforce也是Disabled。重复安装nginx也会导致启动不了nginx服务,但报错信息不是如此的简洁的一句话。或者是配置文件马虎的少了个分号或是就是写错了,但是我是刚安装的nginx且没有更改配置文件!

根据提示,我习惯性的先查了下日志:

# journalctl -xe
Jun 19 14:41:35 server.com nginx[6568]: nginx: [emerg] bind() to [::]:80 failed (98: Address already in use)Jun 19 14:41:36 server.com nginx[6568]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)Jun 19 14:41:36 server.com nginx[6568]: nginx: [emerg] bind() to [::]:80 failed (98: Address already in use)Jun 19 14:41:36 server.com polkitd[828]: Unregistered Authentication Agent for unix-process:6556:1917557 (system bus name :1.177, object path /org/freedesktop/PolicyKit1/AuthenticationAgent, Jun 19 14:41:36 server.com systemd[1]: nginx.service: control process exited, code=exited status=1Jun 19 14:41:36 server.com nginx[6568]: nginx: [emerg] still could not bind()Jun 19 14:41:36 server.com systemd[1]: Failed to start The nginx HTTP and reverse proxy server.-- Subject: Unit nginx.service has failed-- Defined-By: systemd-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel-- -- Unit nginx.service has failed.-- -- The result is failed.
真的是老长一串了,但是仔细看看里面有几行不一样的语句:

nginx: [emerg] bind() to [::]:80 failed (98: Address already in use)nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)貌似明白了什么。再看一下状态:
# systemctl status nginx.service 
● nginx.service - The nginx HTTP and reverse proxy server
   Loaded: loaded (/usr/lib/systemd/system/nginx.service; disabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since Tue 2018-06-19 15:10:38 CST; 13min ago
  Process: 7544 ExecStart=/usr/sbin/nginx (code=exited, status=1/FAILURE)
  Process: 7542 ExecStartPre=/usr/sbin/nginx -t (code=exited, status=0/SUCCESS)
  Process: 7539 ExecStartPre=/usr/bin/rm -f /run/nginx.pid (code=exited, status=0/SUCCESS)

Jun 19 15:10:37 server.com nginx[7544]: nginx: [emerg] bind() to [::]:80 failed (98: Address already in use)
Jun 19 15:10:37 server.com nginx[7544]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
Jun 19 15:10:37 server.com nginx[7544]: nginx: [emerg] bind() to [::]:80 failed (98: Address already in use)
Jun 19 15:10:38 server.com nginx[7544]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
Jun 19 15:10:38 server.com nginx[7544]: nginx: [emerg] bind() to [::]:80 failed (98: Address already in use)
Jun 19 15:10:38 server.com systemd[1]: nginx.service: control process exited, code=exited status=1
Jun 19 15:10:38 server.com nginx[7544]: nginx: [emerg] still could not bind()
Jun 19 15:10:38 server.com systemd[1]: Failed to start The nginx HTTP and reverse proxy server.
Jun 19 15:10:38 server.com systemd[1]: Unit nginx.service entered failed state.
Jun 19 15:10:38 server.com systemd[1]: nginx.service failed.

发现也出现了相同的话,再执行/usr/sbin/nginx,就更明显了
# /usr/sbin/nginx 
nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
nginx: [emerg] bind() to [::]: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 [::]: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 [::]: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 [::]: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 [::]:80 failed (98: Address already in use)
nginx: [emerg] still could not bind()
查看一下端口进程
# netstat -ntpl
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
tcp        0      0 0.0.0.0:6379            0.0.0.0:*               LISTEN      766/redis-server 0. 
tcp        0      0 0.0.0.0:111             0.0.0.0:*               LISTEN      1/systemd           
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      1192/sshd          
tcp        0      0 127.0.0.1:6010          0.0.0.0:*               LISTEN      2605/sshd: [email protected]          
tcp6       0      0 :::80                   :::*                    LISTEN      1363/httpd          
tcp6       0      0 :::22                   :::*                    LISTEN      1192/sshd   
好吧,我的80端口被占用了,nginx用的就是80端口。怪不得起不起来呢。所以如果我想要启动nginx服务有两种方法:
第一种方法:       停止占用我80端口的服务,执行systemctl stop httpd命令。再执行systemctl start nginx.service就成功了。
# systemctl stop httpd.service 
# systemctl restart nginx.service 
# systemctl status nginx.service 
● nginx.service - The nginx HTTP and reverse proxy server
   Loaded: loaded (/usr/lib/systemd/system/nginx.service; disabled; vendor preset: disabled)
   Active: active (running) since Tue 2018-06-19 15:29:19 CST; 19s ago
  Process: 7825 ExecStart=/usr/sbin/nginx (code=exited, status=0/SUCCESS)
  Process: 7822 ExecStartPre=/usr/sbin/nginx -t (code=exited, status=0/SUCCESS)
  Process: 7820 ExecStartPre=/usr/bin/rm -f /run/nginx.pid (code=exited, status=0/SUCCESS)
 Main PID: 7828 (nginx)
   CGroup: /system.slice/nginx.service
           ├─7828 nginx: master process /usr/sbin/nginx
           └─7829 nginx: worker process
第二种方法:       既然80端口被占用,你又不想停止httpd服务,那就更改nginx服务的端口呗。
# vim /etc/nginx/nginx.conf
server {
        listen       8080 default_server;
        listen       [::]:8080 default_server;
        server_name  _;
        root         /usr/share/nginx/html;

        # Load configuration files for the default server block.
        include /etc/nginx/default.d/*.conf;

        location / {
        }

        error_page 404 /404.html;
            location = /40x.html {
        }

        error_page 500 502 503 504 /50x.html;
            location = /50x.html {
        }
    }
打开nginx配置文件,找到server模块里的listen,将数字80改为其它的65535之内的数字(我改的是8080,比较好记还没啥后缀问题)。然后再执行systemctl start nginx,就可以启动起来了。

     


文章来源: Nginx服务启动失败

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