Interview Questions and Answers

Docker is a containerization platform that allows developers to package, distribute, and run applications in isolated environments called containers.

Example:

docker run -d -p 80:80 nginx

Dockerfile is a script that contains instructions for building a Docker image. It specifies the base image, application code, dependencies, and other configurations.

Example:

FROM ubuntu
RUN apt-get update && apt-get install -y nginx

An image is a lightweight, standalone, and executable package that includes everything needed to run a piece of software. A container is a runtime instance of a Docker image.

Example:

docker run -d my_image

You can use the following command to remove all Docker containers: docker rm $(docker ps -a -q)

Example:

docker rm $(docker ps -a -q)

You can use the `docker logs` command followed by the container ID or name to view the logs of a running container.

Example:

docker logs container_name

Docker Hub is a cloud-based registry service that allows developers to share and distribute Docker images. It serves as a central repository for Docker images.

You can use the `docker rmi` command followed by the image ID or name to remove a Docker image.

Example:

docker rmi image_name

Environment variables can be passed to a Docker container using the `-e` or `--env` option with the `docker run` command.

Example:

docker run -e MY_VARIABLE=value my_image

Docker Registry is a storage and distribution system for Docker images. It can be a public registry like Docker Hub or a private registry hosted within an organization.

You can use the `docker build` command followed by the path to the directory containing the Dockerfile.

Example:

docker build -t my_image:latest .