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Steps to set up Docker Lab

It's a prerequisite for the Hands On Session

Create a Docker Hub id

Visit https://hub.docker.com/signup - use your personal email

Verify Email Address

You will receive an email to confirm the Docker Hub account, once confirmed, your account is created with Docker Hub.

Accessing Docker Lab

This is a free online lab environment for Docker, you can access it using the Docker Hub account create using the above steps, visit https://labs.play-with-docker.com/ and click on Login. This will open up a pop-up for login, ensure you don’t have pop-up blocker enabled in your browser. Once logged in with Docker, you should see the start button, click on Start

Add a Docker Instance

Click on ‘ADD NEW INSTANCE’ label under Instance in the left hand side navbar. This will spawn up a docker instance for running lab tasks. Congratulations ! You have successfully setup your lab. You can click on close session if you want to close the lab.

1.Run your first container

  1. Run a container
  2. Run multiple containers
  3. Remove the containers

Run a container :-

Verify version of docker

docker --version

List docker images

docker images

Pull tomcat docker image

docker pull tomcat:8.0

Verify that tomcat docker image is pulled successfully or not

docker images

Run container A

docker run -d -p 8080:8080 --name containerA tomcat:8.0

List running Docker processes

docker ps

Test the application deployed in a container

curl http://localhost:8080

Run multiple containers :-

Pull java docker image

docker pull openjdk:8

Run container B

docker run --name containerB openjdk:8

List all docker processes

docker ps -a

Remove the containers :-

List all docker processes

docker ps -a

Stop running container

docker stop containerA

List all docker processes

docker ps -a

Remove all containers

docker rm containerA containerB

Verify whether docker containers removed or not

docker ps -a

2.Add CI/CD value with Docker images

  1. Create a Java App (without using Docker)
  2. Create and build the Docker image
  3. Run the Docker image
  4. Push to a central registry
  5. Deploy a change
  6. Understand image layers
  7. Remove containers

1. Create a Java App (without using Docker)

2. Create and build the Docker image

3. Run the Docker image

Run container

docker run -it --name javacontainer openjdk:8

Clone the HelloWorld java program

git clone https://gist.github.com/b95b2903d391af2191c63411efb2e113.git

Go inside the cloned directory

cd ./b95b2903d391af2191c63411efb2e113

Compile HelloWorld java program

javac HelloWorld.java

Copy the class to root

cp ./HelloWorld.class /

Go to root

cd /

Test the HelloWorld java program

java HelloWorld
Run apt-get update
apt-get update

Install nano file editor

apt-get install nano

Open bashrc file

nano ~/.bashrc

Add following command at the end and the save using ctrl+o & ctrl+x

java HelloWorld

Test the changes

source ~/.bashrc

Exit from the container

exit

Commit the container to create new docker image

docker commit javacontainer helloworld:1

List all docker images

docker images

Remove the javacontainer

docker rm javacontainer

Run helloworld container

docker run -it --name helloworldcontainer helloworld:1

Exit from the container

exit

Remove the helloworldcontainer

docker rm helloworldcontainer

4. Push to a central registry

Tag the docker image, Here instead of sagarj use your own docker hub username

docker tag helloworld:1 sagarj/helloworld:1

List all the docker image

docker images

Do docker login. Provide your docker hub username & password

docker login

Push helloworld docker image into the docker hub repository

docker push sagarj/helloworld:1

Vist the docker hub and verify that your image is pushed or not

Browse https://hub.docker.com/

5. Deploy a change

6. Understand image layers

Run the helloworldcontainer

docker run -it --name javacontainer helloworld:1

Go inside the cloned directory

cd ./b95b2903d391af2191c63411efb2e113

Edit the HelloWorld program and update the message

nano HelloWorld.java

Compile HelloWorld java program

javac HelloWorld.java

Copy the class to root

cp ./HelloWorld.class /

Go to root

cd /

Test the HelloWorld java program

java HelloWorld

Exit from the javacontainer

exit

Commit the changes

docker commit javacontainer sagarj/helloworld:2

List all docker images

docker images

Remove the javacontainer

docker rm javacontainer

Test the HelloWorld container

docker run --name updatedcontainer -it sagarj/helloworld:2

Exit from the updatedcontainer

exit

Push helloworld docker image into the docker hub repository

docker push sagarj/helloworld:1

Vist the docker hub and verify that your image is pushed or not

Browse https://hub.docker.com/

7. Remove containers

Clean up the containers

docker system prune

Clean up the images

docker rmi -f $(docker images)