Build & Push a Docker Image 101

1. Install Docker / Docker Desktop

Download here https://docs.docker.com/get-docker/

2. Create a Dockerfile

Or just copy this one.

3. Build the Docker Image

cd to the directory where the Dockerfile exists.

docker build -t <image_name> .

Pick whatever <image_name> you like.

After building successfully, test the image by docker run -it <image_name> /bin/bash.

4. Sign Up to Docker Hub

Register here https://hub.docker.com to get your username & password.

5. Log In to Docker Hub

Log in and be prompted to input your username & password.

docker login

6. Tag the Docker Image

docker tag <image_name> <username>/<repository_name>:latest

Pick whatever <repository_name> you like.

7. Push the Image to Docker Hub

docker push <username>/<repository_name>:latest

8. Verify the Image

• Visit: https://hub.docker.com/repository/docker/<username>/<repository_name>

• Use it in devcontainer.json

  {
    "name": "XXX",
    "image": "docker.io/<username>/<repository_name>:latest"
    "customizations": {}
  }