## find the image to push
$ docker images

## tag image
$ docker tag ce160677a129 username/nodejs-webapp-demo

## push image
$ docker push username/nodejs-webapp-demo

$ cat $HOME/.docker/config.json

$ Docker login 
Login with your Docker ID to push and pull images from Docker Hub. If you don't have a Docker ID, head over to https://hub.docker.com to create one.
Username: username
Password: 
Error saving credentials: error storing credentials - err: exec: "docker-credential-desktop": executable file not found in $PATH, out: ``