Write instructions in a dockerfile.

• build the dockerfile and create an image in the registry

docker build -t learn_docker dockerFiles/

• Create a container by running this image

docker run -it learn_docker

• Push the container to the docker hub.

--Tag the local image as:

Examples:

--list the images for this container:

• Image: Screenshot from the Docker hub.
• Docker hub repository: learn_docker has DIFFERENT variations of images. Image names are tagged.
• We can pull the tags from this repository as PER the need.

Summarize:

Develop your application CODE and all other dependencies like the binaries, library files, downloadables required to run the application in the test environment. Bundle it all in a directory.

• Edit the dockerfile to Run the downloadables and replicate the desired production environment as test env.
• Copy the entire application bundle to the test env in the docker container.
• Build the dockerfile and create new docker image and tag it.
• Push this docker image to the docker hub, which is now downloaded by other users to test.

NOTE: This docker image has your application bundle = application code + dependencies + test run time environment exactly similar to your machine. Your application bundle is highly portable with no hassles.