Nginx Port 80 Conflict

Problem

Docker nginx container would not start.

failed to bind host port 0.0.0.0:80

Ubuntu nginx service was already using port 80.

Check what is using port 80:

ss -tulpn | grep :80

Stop nginx:

systemctl stop nginx

Disable nginx:

systemctl disable nginx

Remove nginx:

apt remove nginx nginx-common -y

Try the Docker container again.

docker run -d --name nginx -p 80:80 nginx

The Docker nginx container started successfully and was able to bind to port 80.