DOCKER INTERVIEW QUESTIONS AND ANSWERS, 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 all alike.
Here are the top interview questions and the tips in facing the interview.
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.
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.
Virtualization can be defined as building an application, server, memory unit, etc., as an implied genre.
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 distinct system.
Docker has three important components namely, Client, Host, and Registry.
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.
Hypervisor requires specific hardware whereas Docker runs on Operating systems. So, Hypervisor performs its operations slowly but Docker performs its operations quickly.
Open-source and user-friendly environment.
sudo apt-get install –y docker-engine is the command to install Docker Engine in Linux.
There is no option to reschedule dormant nodes automatically. is very difficult to make horizontal scaling automatically. There is no provision for storage.
We can create a Docker image using the build command. Docker containers cannot be built without a Docker image.
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.
sudo docker run –it centos /bin/bash
docker stop ContainerID
docker rm ContainerID
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.
It is actually a tool used in Docker containers to create and administer clusters.
Docker Compose is a tool to define and run many docker container applications all at once.
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.
We need a Docker machine to install the Docker engine on implied hosts.
Docker contains distinct volumes that are divided among the containers. These distinct volumes are called Data volumes.
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.
Users can easily configure and converse with Docker. User-friendly interface and open-source environment. The primary set up is easy. Efficient and flexible scripts can be built.
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.
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.