Docker Log into Docker Registry

Introduction

In this lab, we will explore the scenario of the magical seafaring world, where you take on the role of a magical maritime trader navigating the seas to trade valuable goods. Your goal is to securely log into the magical maritime trading hub's registry to access and push container images.

Authenticating with Docker Registry

In this step, you will learn how to authenticate with the registry using Docker CLI. If you don't have a Docker Hub account, visit the Docker Hub website and sign up for a free account.If you have a private registry, then you can use docker login <registry-server-address> to log into your registry server.

1. Use the docker login command to authenticate with the magical maritime trading registry:

docker login

2. Upon running the docker login command, you will be prompted to enter your username and password for authentication.

Pushing Images to the Registry

In this step, you will learn how to push a Docker image to the magical maritime trading registry.

1. Tag the alpine with the usename of your Docker Hub account:

docker tag alpine < your-docker-username > /my_alpine:latest

If you use the private registry, you can tag the image with magical maritime trading registry as the prefix:

docker tag alpine magical_maritime_trading.registry/myimage:latest

In the following steps you just need to know how to do this, if you have a real registry server, you must execute docker logout in the terminal to log out from Docker Hub and re-login to your registry server.

2. Push the tagged image to the Docker Hub:

docker push < your-docker-username > /my_alpine:latest

If you use the private registry, you can push the tagged image to the registry use following command:

## Please replace the registry server with your real registry server, or else the command will fail.
docker push magical_maritime_trading.registry/myimage:latest

3. Upon successful push, a digest for the image will be displayed.

Tips

The magical_maritime_trading.registry is a virtual registry server address, if you have a real registry server address, please replace it with the real one.

Summary

In this lab, we have designed a hands-on experience for securely logging into the magical maritime trading registry and pushing container images. By following the steps outlined here, the learners will gain valuable insights into Docker registry authentication and image management, essential skills for any Docker practitioner.