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FOSS Meetup Bangalore April 2024

  • Title - Mastering Docker: A Comprehensive Workshop for Beginners - Slides
  • Date - April 27th, 2024
  • Mode - In-person

Prerequisites

  • 💻 BYOD / Laptop
  • 🐳 Docker Hub account - steps
  • 🆓 Lab options
    1. Play with Docker ( 4 hour time window, small terminal)
    2. Killercoda ( 1 hour time window, full screen terminal, IDE )

Getting started

Say hello-world👋

docker run hello-world

2️⃣0️⃣4️⃣8️⃣ container game🎮 for fun!

docker run -d -p 8080:80 alexwhen/docker-2048

Open port 8080 in your lab environment and enjoy :)

Let's build our first container image using Docker🚀

Create Dockerfile

vi Dockerfile

Copy and paste the below

# Use an existing image as a base
FROM nginx:alpine

# Set working directory
WORKDIR /usr/share/nginx/html

# Set the content of index.html directly
RUN echo "Hello from FOSS Bangalore!" > index.html

# Expose port 80
EXPOSE 80

Press :wq! and enter to save and exit

Build image

docker build -t your_image_name:tag .

Example

docker build -t foss-meetup-bangalore:v1 .

Check built image

docker images

Output

REPOSITORY              TAG       IMAGE ID       CREATED         SIZE
foss-meetup-bangalore   v1        24396f63e519   8 seconds ago   48.3MB

Running container

Run the container from the built image and map the container's 80 port to your system's 8081 port

docker run -d -p 8081:80 --name your_container_name your_image_name:tag

Example

docker run -d -p 8081:80 --name foss-app foss-meetup-bangalore:v1

Check for container's status

docker ps

Output

CONTAINER ID   IMAGE                      COMMAND                  CREATED         STATUS         PORTS                                   NAMES
1299e4a5a49d   foss-meetup-bangalore:v1   "/docker-entrypoint.…"   6 seconds ago   Up 5 seconds   0.0.0.0:8081->80/tcp, :::8081->80/tcp   foss-app

Access the application

curl localhost:8081

Output

Hello from FOSS Bangalore!

OR Open port 8081 in your lab environment

Pushing image to Docker Hub

Create a repository in your Docker Hub account here

Login to docker

docker login

Tag & push image to Docker Hub

docker tag your_image_name:tag username/repository_name:tag

Example

docker tag foss-meetup-bangalore:v1 rootxaman/foss-meetup-bangalore:v1

docker push username/repository_name:tag

Example

docker push rootxaman/foss-meetup-bangalore:v1

Making and committing changes to container

Make changes to the running container

docker exec -it container_name /bin/sh

Example

docker exec -it foss-app /bin/sh

Output

/usr/share/nginx/html #

Let's add a new line to our webpage -> We are learning Docker.

Open index.html using vi editor and press i to enter INSERT mode

vi index.html

Updated content

Hello from FOSS Bangalore! <br> We are learning Docker.

Press :wq! and enter to save and exit

After making the changes, they are updated in real-time and served. You can verify the changes by using the following command from inside the container:

curl localhost

Output

Hello from FOSS Bangalore! <br> We are learning Docker.

Exit from the container

exit

Changes can also be verified from outside the container

curl localhost:8081

Output

Hello from FOSS Bangalore! <br> We are learning Docker.

OR Open port 8081 in your lab environment

Commit changes and create a new image from the container (running)

docker commit container_name your_image_name:new_tag

Example

docker commit foss-app foss-meetup-bangalore:v2

Tag the new image

docker tag your_image_name:new_tag username/repository_name:new_tag

Example

docker tag foss-meetup-bangalore:v2 rootxaman/foss-meetup-bangalore:v2

Push the new image to Docker Hub

docker push username/repository_name:new_tag

Example

docker push rootxaman/foss-meetup-bangalore:v2

Run a container using the new image

docker run -d -p 8082:80 --name new_container_name username/repository_name:new_tag

Example

docker run -d -p 8082:80 --name foss-app-2 rootxaman/foss-meetup-bangalore:v2

curl localhost:8082

Output

Hello from FOSS Bangalore! <br> We are learning Docker.

OR Open port 8082 in your lab environment

Congratulations and Summary

Congratulations on completing the "Mastering Docker: A Comprehensive Workshop for Beginners" at FOSS Meetup Bangalore April 2024! 🎉

Summary of Learnings:

  • Getting Started: We started with the basics of Docker by running the "hello-world" container and enjoying the "2048" container game.
  • Building Our First Container Image: We created a custom Docker image using a Dockerfile to serve a webpage with the message "Hello from FOSS Bangalore!".
  • Running and Testing the Container: We ran our container, mapped it to a host port, and verified the webpage using curl or by opening the port in our lab environment.
  • Pushing Image to Docker Hub: We learned how to push our Docker image to Docker Hub, making it accessible to others.
  • Making and Committing Changes to Container: We explored how to make changes to a running container, update its content, and commit those changes to create a new Docker image.
  • Deploying a New Container with Updated Image: Finally, we deployed a new container using the updated Docker image and verified the changes.

Next Steps:

Continue exploring Docker and its ecosystem! Experiment with different Docker commands, explore container orchestration with Docker Compose or Kubernetes, and dive deeper into containerized application development.

Once again, congratulations on your journey into Docker! We hope you found this workshop valuable and look forward to seeing what you build with Docker in the future.

Happy Dockering! 🐳✨