Q1. What is Docker and how is it different from virtualization?
Answer: Docker is a platform that allows developers to package and deploy applications in containers. Containers are a lightweight and portable way to package application software, its dependencies, and configuration settings in a single package. Unlike virtualization, which runs multiple operating systems on a single physical machine, Docker containers share work on the host and isolate only the application and its dependencies
Q2. What are the benefits of using Docker?
Answer: Docker has many advantages such as portability, scalability, and isolation. Containers are flexible, meaning they can be easily moved between different locations such as development, testing and production. In addition, their scalability allows applications to be easily replicated and scaled horizontally.
In addition, containers have isolation, which helps ensure that applications and their dependencies do not interfere with each other.
Q3. What is a Docker image?
Answer: A Docker image is a snapshot of a container that contains the application code, its dependencies, and the configuration needed to run the application. Docker images are usually stored in a directory, such as Docker Hub, where they can be easily shared and distributed.
Q4. What is a Docker container?
Answer: A Docker container is a lightweight executable package that contains everything needed to run an application, including application code, dependencies, and all settings. Containers are isolated from each other and share the host's work.
Q5.How to create a Docker image?
Answer: A Docker image can be created using Dockerfile, which is a text file with instructions for creating the image. The Dockerfile describes the base image, the application code, its dependencies, and any configuration needed to run the application. After the dockerfile is created, the image can be built using the docker build command.
Q6.How to run Docker containers?
Answer: A Docker container can be run using the docker run command, which starts a new container based on the specified image. The command can also specify other options such as port mapping, volume settings, and environment variables.
Q7. How to distribute Docker images to others?
Answer: Write a YAML file to define the services that make up your application and any configuration required for each service to run. Once defined, the application can be easily started and stopped using the docker-compose command.
Q8. What is Docker Compose?
Answer: Docker Compose is a tool that allows developers to define and run multi-container Docker applications. Compose uses a YAML file to define the services that make up the application, along with any configuration settings needed to run each service. Once defined, the application can be easily started and stopped using the docker-compose command.
Q9. What is Docker Swarm?
Answer: Docker Swarm is a container orchestration that allows developers to manage and scale containers across multiple hosts.
Swarm provides a single endpoint API for managing multiple Docker hosts, allowing developers to easily list and deploy applications on these hosts.
Q10. What is Kubernetes?
Answers: Kubernetes is an open container orchestration platform that automates the deployment, scaling, and management of containerized applications. Kubernetes provides powerful tools for managing containers and their dependencies, and allows developers to deploy applications across multiple organizations and environments.