Docker-Kubernetes-jar-file

Create Docker image of a java jar file and manage the container image using Kubernetes

Docker

• Docker is a open source tool.
• It is designed to makes it easier to create, deploy and run applications by using containers.
• Containers allow a developer to package up an application with all of the parts it needs, such as libraries and other dependencies, and ship it all out as one package, called image.
• It ensures that the application will run the same no matter which server or laptop its running on.
• This way, it eliminates the “it works on my machine” problem.
• Developers will not spend time in setting up environments or debugging environment-specific issues.
• Ensures consistent environments from development to production.

Kubernetes

• It is an open source container orchestration tool.
• It is used to automate deployments, scaling, and operations of application containers across clusters of hosts
• Kubernetes is capable of doing auto-placement, auto-restart, auto-replication and auto-healing of containers extremely well.

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Create docker image of a runnable jar file:

1. Clone the repository

git clone 

2. Open command prompt or powershell and build the dockerfile

docker build -t java_helloworld .

(Note: Don't forget to put dot (.) at the end of the command)

3. Check docker-images

docker images

4. Run the docker image

docker run java_helloworld

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Push docker image to docker hub

1. Log in to Docker Hub. Enter your password when prompted

docker login --username=yourusername --email=youremail@company.com

2. Tag your image

docker tag java_helloworld yourusername/java_helloworld:latest

3. Push your image to docker hub repository

docker push yourusername/java_helloworld

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Manage image container using Kubernetes

Create container by running yaml file

kubectl apply -f java_helloworld.yaml