What is docker and how it works | System Design Interview Questions

Docker is an open-source platform used for building, shipping, and running applications in containers. Containers provide a lightweight and portable way of packaging software and its dependencies.

Docker works by creating a container image that contains the application and its dependencies. The container image is a read-only template that can be used to create one or more container instances. Each container instance is a separate and isolated environment that runs the application.

Docker uses a client-server architecture. The Docker client communicates with the Docker daemon, which runs on the host machine. The Docker daemon manages the container images, container instances, and other Docker resources.

To use Docker, you need to create a Dockerfile, which is a script that defines the container image. The Dockerfile specifies the base image, the application and its dependencies, and any other configuration or settings. Once the Dockerfile is created, you can build the container image using the Docker build command.

After the container image is built, you can run it using the Docker run command. Docker will create a new container instance based on the image, and the application will run inside the container. The container can be stopped, started, and deleted using Docker commands.

Overall, Docker provides an efficient and consistent way of packaging and running applications in different environments, making it a popular tool for software development and deployment.

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