Here is the list of frequently asked questions about Docker. We hope these questions and
answers will help the aspirants to clear the technical interviews and get a job in the
Networking industry. It will be useful for freshers, intermediates, and professionals
1. Define Docker.
Docker can be defined as the open-source technology that actually runs on the platform
called Containerization through which one can establish applications through automating
them through containers.
2. Define Containerization.
It can be defined as a package of containers with all needed file systems including
tools, libraries, etc., to run a script in an open-source software environment. Some of
the environments that make use of Containerization are Kubernetes, Docker, etc.
3. Define Virtualization.
Virtualization can be defined as building an application, server, memory unit, etc., as
an implied genre.
4. What is Hypervisor?
Virtualization can be established by Hypervisor software only. It segregates a system
into several sections and assigns it to operate every single section to function as a
5. What are the important components of Docker?
Docker has three important components namely, Client, Host, and Registry.
6. What is the role of the components of Docker?
Client initiates a program that passes a run command and a build command to the host
system. The dock containers and Docker images were built and stored in the host. These
were passed to the Registry to execute everything.
7. How is Hypervisor different from Docker?
Hypervisor requires specific hardware whereas Docker runs on Operating systems. So,
Hypervisor performs its operations slowly but Docker performs its operations quickly.
8. State the main characteristics of Docker.
Open-source and user-friendly environment.
9. What is the command to install Docker in Linux?
sudo apt-get install –y docker-engine is the command to install Docker Engine in Linux.
10. What is the command to run Docker in Ubuntu Linux?
11. What are the disadvantages of Docker?
12. How can you create a Docker image?
We can create a Docker image using the build command. Docker containers cannot be built
without a Docker image.
13. What is the Docker hub?
After creating Docker containers through Docker images, there is a separate registry
called Docker registry created to store these Docker images. This Docker registry is
known as Docker hub.
14. What is the syntax to run a Docker container?
sudo docker run –it centos /bin/bash
15. How to stop the running Docker container?
docker stop ContainerID
16. How to delete a Docker container?
docker rm ContainerID
17. Define the namespace of Docker.
Docker namespace is a feature present in Linux. It is used to segregate Docker
containers. These namespaces are flexible and can be applied to any hosts seamlessly.
18. What is Docker Swarm?
It is actually a tool used in Docker containers to create and administer clusters.
19. What is Docker Compose?
Docker Compose is a tool to define and run many docker container applications all at
20. What are the features of Docker Compose?
It saves the volume of data. It uses a project name as identity and it is capable of
running many numbers of distinct environments over one host.
21. What is the Docker machine?
We need a Docker machine to install the Docker engine on implied hosts.
22. What are Data volumes in Docker?
Docker contains distinct volumes that are divided among the containers. These distinct
volumes are called Data volumes.
23. What do you mean by the Docker cloud?
It is the additional support provided by Docker through which the developer could
perform several operations. They are nodes, uninterrupted integration, uninterrupted
deployment, cloud repose, and software deployment.
24. What are the advantages of Docker?
25. What is Kubernetes? What is its relation with Docker containers?
Kubernetes is a supporting feature to be used with Docker. It allows Docker containers
to establish communication with the real world.
26. What is Jenkins? Can it be used with Docker?
It is the most popular continuous integration tool used by developers to create web
applications. It contains enough plugins to access the containers. Docker contains a
specific plugin for the Jenkins tool.
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