Docker (Container Application)

How to Build a Docker Image?

For creating docker image, we need Dockerfile

The name should be Dockerfile

Inside Dockerfile,

• FROM --> from what image you are using i.e. node:20
• WORKDIR --> create a work directory i.e. /calculator-app
• COPY --> copy local files into image i.e. COPY server.js .
• EXPOSE --> tell the developer, in which port the service is running i.e. EXPOSE 5000
• CMD --> execute the command i.e. CMD ["node","server.js"]

Build the Image

docker build -t image-name .

This will build the docker image

Run the Image in Container (No volume)

Running the image will run on a container which is created on the execution of the image

# docker run -p 9002:5000 --name=container-name image-name

docker run -p 9002:5000 --name=calci-v1 calculator 

It will run the image in http://localhost:9002

How to Create the Docker Volume?

# docker volume create <volume-name>

docker volume create calci-vol

Run the Image in Container (With Volume)

# docker run -p 9002:5000 -v volume-name:/folder-name --name=whatever-name-you-want folder-name

docker run -p 9002:5000 -v calci-vol:/calci-storage --name=calci-v1 calculator 

How to Check the things?

docker <things> ls  # things refers to image, container,cvolume etc

How to bind mount?

Bind mount is a concept of mounting the local storage to a Container

docker run -p 9002:5000 -v path\to\local_vault:/calci-storage --name=calci-v1 calculator  

For any reference, watch this detailed video: https://youtu.be/i8vnIi08UxQ

How to tag them?

Need to sign in to docker and gget a username. The tagging is the crucial part thats how others can pull our docker image.

docker tag image-name username/folder-name 

To pull my docker image, run the below command.

# docker pull image-name username/folder-name
docker pull calculator aashifm/calculator

To remove the tag, run below command.

# docker rmi <image-name>:<tag>
docker rmi calculator:latest