Job for nginx.service failed because the control process exited with error code. See "systemctl status nginx.service" and "journalctl -xe" for details.
根据错误 提示 执行命令 ：
systemctl status nginx.service
然后 提示：
[root@VM_0_3_centos ~]# 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 2019-11-17 21:04:28 CST; 16s ago
Process: 17997 ExecStart=/usr/sbin/nginx (code=exited, status=1/FAILURE) （重点在此）
Process: 17994 ExecStartPre=/usr/sbin/nginx -t (code=exited, status=0/SUCCESS)
Process: 17993 ExecStartPre=/usr/bin/rm -f /run/nginx.pid (code=exited, status=0/SUCCESS)
Nov 17 21:04:27 VM_0_3_centos nginx[17997]: nginx: [emerg] bind() to [::]:443 failed (98: Address already in use)
Nov 17 21:04:27 VM_0_3_centos nginx[17997]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
Nov 17 21:04:27 VM_0_3_centos nginx[17997]: nginx: [emerg] bind() to 0.0.0.0:443 failed (98: Address already in use)
Nov 17 21:04:27 VM_0_3_centos nginx[17997]: nginx: [emerg] bind() to [::]:80 failed (98: Address already in use)
Nov 17 21:04:27 VM_0_3_centos nginx[17997]: nginx: [emerg] bind() to [::]:443 failed (98: Address already in use)
Nov 17 21:04:28 VM_0_3_centos systemd[1]: nginx.service: control process exited, code=exited status=1
Nov 17 21:04:28 VM_0_3_centos nginx[17997]: nginx: [emerg] still could not bind()
Nov 17 21:04:28 VM_0_3_centos systemd[1]: Failed to start The nginx HTTP and reverse proxy server.
Nov 17 21:04:28 VM_0_3_centos systemd[1]: Unit nginx.service entered failed state.
Nov 17 21:04:28 VM_0_3_centos systemd[1]: nginx.service failed.
根据提示： ExecStart=/usr/sbin/nginx (code=exited, status=1/FAILURE) （重点在此）
执行：
/usr/sbin/nginx -c /etc/nginx/nginx.conf
ok 正常了。
重新启动：
systemctl start nginx
一切正常。
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