[root@static ~]# sudo nginx
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()
[root@static ~]#

tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      5808/nginx: worker
tcp6       0      0 :::80                   :::*                    LISTEN      5808/nginx: worker
tcp6       0      0 :::8081                 :::*                    LISTEN      6883/node