DOCKER Assignment

1] Custom Docker Image

Create a docker image and push it to docker hub & ECR

Create a Custom image

Build the custom image

docker build -t <img_name> .

Rename the image with proper git hub notation

docker tag <img_name> <new_name>

Create a repo in DockerHub & login to it using docker login command

docker login -u <user_id> -p <password>

Now push the image using "docker push"

To push the image to ECR

Create an IAM user with necessary setup

Create a Repo in ECR

Give the necessary tag

Configure "aws ecr get-login-password"

And push the image

2] File operations

Copy a file from host machine to a running container

  docker cp <source_file_path> <container_id:destination_path>

Copy a file from running container to a host machine

docker cp <container_id>:<path_of_file> <destination_path>

3] Multi Stage Dockerfile

Write a Multi Stage Dockerfile for building and hosting a java application
Checkout the code from repository
copy the pom.xml & source code, then build a war file
Copy the war file and deploy it to a Tomcat environment

4] Docker File instructions

WORKDIR : it creates a directory and switches to that directory

USER : The USER instruction sets the user name or UID to use when running the image and for any RUN, CMD and ENTRYPOINT instructions that follow it in the Dockerfile

EXPOSE : it informs Docker that the container listens on the specified network ports at runtime

SHELL : it can be used more than once in a Dockerfile. All instructions that use a shell, and that come after a SHELL instruction, will use the new shell. Thus, you can change the shell multiple times in a single Dockerfile as needed

5] Jenkins Pipeline:

Create a Jenkins pipeline with the following stages;

- Checkout Stage: Checkout the source code that contains the Dockerfile.

- Build Stage: Build a Docker image using the Docker CLI.

- Push Stage: Push the image to ECR.

- Deploy Stage: Deploy the image to a Docker server as a container.

Install Jenkins

Install Docker

Install docker & docker pipeline pluggin

Give ecr-registry-full-access to ec2 instance