[root@localhost bin]# nginx -t
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful
[root@localhost bin]# nginx
nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:443 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 0.0.0.0:443 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 0.0.0.0:443 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 0.0.0.0:443 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 0.0.0.0:443 failed (98: Address already in use)
nginx: [emerg] bind() to [::]:80 failed (98: Address already in use)
nginx: [emerg] still could not bind()
[root@localhost bin]# 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 Mon 2018-04-09 16:35:28 IST; 6min ago
Process: 22654 ExecStart=/usr/sbin/nginx (code=exited, status=1/FAILURE)
Process: 22597 ExecStartPre=/usr/sbin/nginx -t (code=exited, status=0/SUCCESS)
Process: 22595 ExecStartPre=/usr/bin/rm -f /run/nginx.pid (code=exited, status=0/SUCCESS)
Apr 09 16:35:27 localhost.localdomain nginx[22654]: nginx: [emerg] bind() to 0.0.0.0:443 failed (98: Address already in use)
Apr 09 16:35:27 localhost.localdomain nginx[22654]: nginx: [emerg] bind() to [::]:80 failed (98: Address already in use)
Apr 09 16:35:28 localhost.localdomain nginx[22654]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
Apr 09 16:35:28 localhost.localdomain nginx[22654]: nginx: [emerg] bind() to 0.0.0.0:443 failed (98: Address already in use)
Apr 09 16:35:28 localhost.localdomain nginx[22654]: nginx: [emerg] bind() to [::]:80 failed (98: Address already in use)
Apr 09 16:35:28 localhost.localdomain systemd[1]: nginx.service: control process exited, code=exited status=1
Apr 09 16:35:28 localhost.localdomain nginx[22654]: nginx: [emerg] still could not bind()
Apr 09 16:35:28 localhost.localdomain systemd[1]: Failed to start The nginx HTTP and reverse proxy server.
Apr 09 16:35:28 localhost.localdomain systemd[1]: Unit nginx.service entered failed state.
Apr 09 16:35:28 localhost.localdomain systemd[1]: nginx.service failed.
How can i fixed.
I suggest to try to debug in this way (just copy-paste into the console, then execute):
This is a super comfortable way to debug.
I got the error like 2139#2139: listen() to [::] :80, backlog 511 failed (98: Address already in use)