Nginx启动出现Restarting nginx (via systemctl): Job for nginx.service failed because the control process exited with error code. See “systemctl status nginx.service” and “journalctl -xe” for details.问题

1、查看防火墙启动的端口号

[root@iZuf68mr29sh8zy1elsaixZ ~]# firewall-cmd --list-ports
80/tcp 3306/tcp

2、重启防火墙

[root@iZuf68mr29sh8zy1elsaixZ ~]# firewall-cmd --reload
success

3、重启nginx，出现如下错误

[root@iZuf68mr29sh8zy1elsaixZ ~]# service nginx restart
Restarting nginx (via systemctl):  Job for nginx.service failed because the control process exited with error code. See "systemctl status nginx.service" and "journalctl -xe" for details.

这种错误一般都是目录不存在或者权限不足，所以直接执行下面两条命令即可，结果发现根本行不通。

[root@iZuf68mr29sh8zy1elsaixZ ~]# cd /var/tmp/
[root@iZuf68mr29sh8zy1elsaixZ ~]# mkdir -p /var/tmp/Nginx/{client,proxy,fastcgi,uwsgi,scgi}

4、查看nginx服务

[root@iZuf68mr29sh8zy1elsaixZ ~]# 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 Sun 2023-02-05 11:02:23 CST; 36s ago
  Process: 1416 ExecStartPre=/usr/sbin/nginx -t (code=exited, status=1/FAILURE)
  Process: 1414 ExecStartPre=/usr/bin/rm -f /run/nginx.pid (code=exited, status=0/SUCCESS)

Feb 05 11:02:23 iZuf68mr29sh8zy1elsaixZ systemd[1]: Starting The nginx HTTP an...
Feb 05 11:02:23 iZuf68mr29sh8zy1elsaixZ nginx[1416]: nginx: the configuration ...
Feb 05 11:02:23 iZuf68mr29sh8zy1elsaixZ nginx[1416]: nginx: [emerg] bind() to ...
Feb 05 11:02:23 iZuf68mr29sh8zy1elsaixZ nginx[1416]: nginx: configuration file...
Feb 05 11:02:23 iZuf68mr29sh8zy1elsaixZ systemd[1]: nginx.service: control pro...
Feb 05 11:02:23 iZuf68mr29sh8zy1elsaixZ systemd[1]: Failed to start The nginx ...
Feb 05 11:02:23 iZuf68mr29sh8zy1elsaixZ systemd[1]: Unit nginx.service entered...
Feb 05 11:02:23 iZuf68mr29sh8zy1elsaixZ systemd[1]: nginx.service failed.
Hint: Some lines were ellipsized, use -l to show in full.

可以看到nginx出现错误：

Process: 1416 ExecStartPre=/usr/sbin/nginx -t (code=exited, status=1/FAILURE)
  Process: 1414 ExecStartPre=/usr/bin/rm -f /run/nginx.pid (code=exited, 

可以看出修改完配置信息后没有提交：

[root@iZuf68mr29sh8zy1elsaixZ tmp]# nginx -t -c /etc/nginx/nginx.conf
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: [emerg] bind() to 139.196.234.86:80 failed (99: Cannot assign requested a ddress)

结果发现80端口被占用：

[root@iZuf68mr29sh8zy1elsaixZ tmp]# netstat -natp |grep 80
tcp        0      0 172.16.85.16:43064      100.100.30.26:80        ESTABLISHED 1189/AliYunDun

将80端口杀死：

[root@iZuf68mr29sh8zy1elsaixZ tmp]# kill 1189
[root@iZuf68mr29sh8zy1elsaixZ tmp]# netstat -natp |grep 80
tcp        0      0 172.16.85.16:43064      100.100.30.26:80        TIME_WAIT   -

5.测试nginx服务

执行测试：

[root@iZuf68mr29sh8zy1elsaixZ tmp]# nginx -t
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful

测试成功

重新加载配置文件：

[root@iZuf68mr29sh8zy1elsaixZ tmp]# nginx -s reload
nginx: [error] invalid PID number "" in "/run/nginx.pid"

出现错误

重启：

[root@iZuf68mr29sh8zy1elsaixZ tmp]# nginx -c /etc/nginx/nginx.conf
nginx: [emerg] bind() to 139.196.234.86:80 failed (98: Address already in use)
nginx: [emerg] bind() to 139.196.234.86:8000 failed (98: Address already in use)
nginx: [emerg] bind() to 139.196.234.86:80 failed (98: Address already in use)
nginx: [emerg] bind() to 139.196.234.86:8000 failed (98: Address already in use)
nginx: [emerg] bind() to 139.196.234.86:80 failed (98: Address already in use)
nginx: [emerg] bind() to 139.196.234.86:8000 failed (98: Address already in use)
nginx: [emerg] bind() to 139.196.234.86:80 failed (98: Address already in use)
nginx: [emerg] bind() to 139.196.234.86:8000 failed (98: Address already in use)
nginx: [emerg] bind() to 139.196.234.86:80 failed (98: Address already in use)
nginx: [emerg] bind() to 139.196.234.86:8000 failed (98: Address already in use)
nginx: [emerg] still could not bind()

发现报了如此对的错误信息

此时将nginx的所有进程都杀死：

killall nginx

重新启动nginx，就可以正常运行了

[root@iZuf68mr29sh8zy1elsaixZ tmp]# service nginx start
Starting nginx (via systemctl):                            [  OK  ]
[root@iZuf68mr29sh8zy1elsaixZ tmp]# 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 Sun 2023-02-05 11:20:16 CST; 40s ago
  Process: 1763 ExecStart=/usr/sbin/nginx (code=exited, status=0/SUCCESS)
  Process: 1760 ExecStartPre=/usr/sbin/nginx -t (code=exited, status=0/SUCCESS)
  Process: 1756 ExecStartPre=/usr/bin/rm -f /run/nginx.pid (code=exited, status=0/SUCCESS)
 Main PID: 1764 (nginx)
   CGroup: /system.slice/nginx.service
           ├─1764 nginx: master process /usr/sbin/nginx
           ├─1765 nginx: worker process
           └─1766 nginx: worker process

Feb 05 11:20:16 iZuf68mr29sh8zy1elsaixZ systemd[1]: Starting The nginx HTTP and reverse proxy server...
Feb 05 11:20:16 iZuf68mr29sh8zy1elsaixZ nginx[1760]: nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
Feb 05 11:20:16 iZuf68mr29sh8zy1elsaixZ nginx[1760]: nginx: configuration file /etc/nginx/nginx.conf test is s...sful
Feb 05 11:20:16 iZuf68mr29sh8zy1elsaixZ systemd[1]: Started The nginx HTTP and reverse proxy server.
Hint: Some lines were ellipsized, use -l to show in full.