Top 100 Docker Interview Questions and Answers

docker system prune is used to clean up unused Docker resources.

• docker system prune helps to free up disk space by removing unused containers, images, networks, and volumes

• It can be used to remove stopped containers, dangling images, unused networks, and unused volumes

• The command can be customized with flags to specify which resources to prune

• Example: docker system prune -a removes all unused resources, including stopped containers and unused images

Docker is a containerization platform that allows applications to be packaged and run in isolated environments. DevOps is a software development methodology that focuses on collaboration, automation, and integration between development and operations teams.

• Docker is a tool designed to make it easier to create, deploy, and run applications by using containers.

• Containers allow a developer to package up an application with all parts it needs, such as libraries and other dependen...read more

Docker is a platform that allows you to package, distribute, and run applications in containers.

• Docker is a tool designed to make it easier to create, deploy, and run applications by using containers.

• Containers allow a developer to package up an application with all parts it needs, such as libraries and other dependencies, and ship it all out as one package.

• Docker containers are lightweight and share the same operating system kernel, making them more efficient than virtual ma...read more

Docker is a containerization platform that allows developers to package applications with all dependencies into a standardized unit for easy deployment.

• Docker allows for consistent development, testing, and deployment environments across different systems.

• It improves scalability and resource utilization by isolating applications in lightweight containers.

• Docker simplifies the process of managing dependencies and configurations, making it easier to deploy applications in vario...read more

The docker ps command is used to list all the running containers on a Docker host.

• It provides information about the container ID, image used, command being run, status, ports, and names of the running containers.

• It helps in monitoring and managing the containers on a Docker host.

• The command can be used with various options to filter and format the output as per requirements.

• Example: 'docker ps -a' lists all containers, including the ones that are not running.

• Example: 'docker ...read more

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

• Docker attach allows you to attach to a running container's console output, while docker exec allows you to run a command inside a running container.

• Docker attach is used to view the output of a container, while docker exec is used to execute a command inside a container.

• Docker attach is used for debugging purposes, while docker exec is used for runni...read more

Docker attached mode runs a container in the foreground, while detached mode runs it in the background.

• In attached mode, you can see the container's output in the terminal where it was started.

• In detached mode, the container runs in the background and you can continue using the terminal.

• To exit a Docker exec session without closing the terminal, press Ctrl + P, Ctrl + Q.

• You can also use the command 'exit' or 'Ctrl + D' to exit the Docker exec session.

Docker is a platform for developing, shipping, and running applications in containers. Kubernetes is an open-source system for automating deployment, scaling, and management of containerized applications.

• Docker allows developers to package applications and their dependencies into containers for easy deployment and scalability.

• Kubernetes helps in automating the deployment, scaling, and management of containerized applications across a cluster of nodes.

• Docker containers are lig...read more