CentOS starts nginx and prompts nginx: [emergency] still could not bind ()

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[root@iZbp1aed32ln6eZ sbin]# netstat -ntlp|grep 80
tcp        0      0 127.0.0.1:8005          0.0.0.0:*               LISTEN      1501/java           
tcp        0      0 0.0.0.0:8009            0.0.0.0:*               LISTEN      1501/java           
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      7225/nginx: master  
tcp        0      0 0.0.0.0:8081            0.0.0.0:*               LISTEN      7036/java           
[root@iZbp1aed32ln6eZ sbin]# kill -9 7225
[root@iZbp1aed32ln6eZ sbin]# ./nginx -s reload
nginx: [alert] kill(7225, 1) failed (3: No such process)
[root@iZbp1aed32ln6eZ sbin]# /usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/nginx.conf
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@iZbp1aed32ln6eZ sbin]# netstat -ntlp|grep 80
tcp        0      0 127.0.0.1:8005          0.0.0.0:*               LISTEN      1501/java           
tcp        0      0 0.0.0.0:8009            0.0.0.0:*               LISTEN      1501/java           
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      7276/nginx: worker  
tcp        0      0 0.0.0.0:8081            0.0.0.0:*               LISTEN      7036/java           
[root@iZbp1aed32ln6eZ sbin]# killall -9 nginx
[root@iZbp1aed32ln6eZ sbin]# systemctl restart nginx
Failed to restart nginx.service: Unit not found.
[root@iZbp1aed32ln6eZ sbin]# /usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/nginx.conf
[root@iZbp1aed32ln6eZ sbin]# ./nginx -s reload

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