Lesson 9 of 9By John Terra
Last updated on Oct 14, 20208727It pays to go into a job interview as prepared as possible. You should not only have your resume and references squared away, but you should also have a solid grasp of what the position entails and what the company is like.
For instance, researching the company shows the interviewer that you have a genuine interest in the organization and have taken the time to do your homework.
But you need to brush up on the information relating to the position you’re applying for. For example, if you’re applying for a job that heavily relies on Docker cloud computing, then you should brush up on your Docker knowledge.
In the spirit of preparing you for that all-important job interview, we present a collection of Docker interview questions and answers for experienced, intermediate, and primary levels.
While there’s no way to cover the entire range of Docker container interview questions adequately, you’ll find a good cross-section of challenges that you most likely will face. Once you get better acquainted with these interview questions on Docker, you’ll be better prepared to sit down for that interview with a higher level of confidence.
So let’s start with the easy docker interview questions and work our way up to the more complicated issues.
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Docker is an open-source containerization platform. It is used to automate the deployment of any application, using lightweight, portable containers.
Docker’s most essential features include:
Docker gives users many incentives for adoption, such as:
Docker isn’t perfect. It comes with its share of drawbacks, including:
The three main Docker components are:
Containers are deployed applications bundled with all necessary dependencies and configuration files. All of the elements share the same OS kernel. Since the container isn’t tied to any one IT infrastructure, it can run on a different system or the cloud.
Virtualization is the means of employing software (such as Hypervisor) to create a virtual version of a resource such as a server, data storage, or application. Virtualization lets you divide a system into a series of separate sections, each one acting as a distinct individual system. The virtual environment is called a virtual machine.
Virtualization is an abstract version of a physical machine, while containerization is the abstract version of an application.
Although there are several different ways of describing the steps in a Docker container’s lifecycle, the following is the most common:
The most critical Docker commands are:
Labels are the mechanism for applying metadata to Docker objects such as containers, images, local daemons, networks, volumes, and nodes.
Use the command: /var/lib/docker/volumes
This command gives you all the information you need: $ docker version
To create a container, you pull an image from the Docker repository and run it using the following command: $ docker run -it -d <image_name>
Use the following command: $ sudo docker stop container name
Use the command: $ docker ps
Docker containers have the potential to be scaled to any level needed. Thanks to the platform’s flexibility, you can have anything from a few hundred to a few thousand, to millions of containers, providing they all have continual, unconstrained access to the required memory and OS.
It’s a command used to remove all stopped containers, unused networks, build caches, and dangling images. Prune is one of the most useful commands in Docker. The syntax is: $ docker system prune
Some advanced commands include:
Any data stored in a container remains there unless you delete the container.
The Linux platforms are:
Docker can also run on the following cloud-based platforms:
Stop the container first, then remove it. Here’s how:
Since the default flag -reset is set to false, a container cannot restart by itself.
You use a combination of Rest API, socket.IO, and TCP to facilitate communication.
Yes, you can. You can run Jenkins on Docker and use Docker Compose to run integration tests.
Use the following command: docker swarm init –advertise-addr <manager IP>
Using the above Docker interview questions and answers is a sound way to prepare for an interview, but you should also consider reading up on some Docker-related subjects. Simplilearn has an excellent selection to choose from.
This Docker tutorial offers you an excellent foundation on which to build, covering the fundamentals. What is Docker and Docker Container? gives you some more detail, expanding on the information provided by the tutorial. Since Docker is such an integral part of DevOps today, you’ll want to read Best DevOps Tools to Learn and Master. It doesn’t focus exclusively on Docker but instead offers an overview of the many different tools used in DevOps, and yes, Docker is featured.
Finally, the DevOps Certification Training Course will prepare you for a career in DevOps. You’ll become an expert in the principles of continuous development and deployment, automation of configuration management, inter-team collaboration, and IT service agility, using modern DevOps tools such as Git, Docker, Jenkins, Cucumber, Ansible, TeamCity, and Nagios.
Want to brush up on your knowledge on the topics related to docker? Try answering this DevOps mock test and find out now!Â
If you’ve already started working with Docker in a DevOps capacity, you should consider boosting those skills to a higher level. By upskilling and gaining in-depth certification, you increase your marketability, earning potential, and demand in today’s competitive workplace.
That’s why the Docker In-Depth Certification Training course is an absolute must for the professional who wants to stay ahead of the pack. The course provides you with a career boost by using real-life examples. It offers you the best learning experience for Docker technologies like Docker Compose, DockerHub, Docker Swarm, and Docker Containers.
So take those first steps into the world of Docker today and watch your professional career take off!
John Terra lives in Nashua, New Hampshire and has been writing freelance since 1986. Besides his volume of work in the gaming industry, he has written articles for Inc.Magazine and Computer Shopper, as well as software reviews for ZDNet. More recently, he has done extensive work as a professional blogger. His hobbies include running, gaming, and consuming craft beers. His refrigerator is Wi-Fi compliant.
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