Best 20 Docker Container Questions & Answers 2022

Docker Container is an open platform for developing, shipping, and running applications. Docker Container enables you to separate your applications from your infrastructure so you can deliver software quickly. With Docker Container, you can manage your infrastructure in the same ways you manage your applications.

Docker Container

By taking advantage of Docker’s Container methodologies for shipping, testing, and deploying code quickly, you can significantly reduce the delay between writing code and running it in production.

A Docker container is a standard unit of software that packages up code and all its dependencies so the application runs quickly and reliably from one computing environment to another. A Docker container image is a lightweight, standalone, executable package of software that includes everything needed to run an application: code, runtime, system tools, system libraries and settings.

Docker Containerized Applications

Docker Container images become containers at runtime and in the case of Docker containers – images become containers when they run on Docker Engine. Available for both Linux and Windows-based applications, containerized software will always run the same, regardless of the infrastructure. Containers isolate software from its environment and ensure that it works uniformly despite differences for instance between development and staging.

Docker architecture

Docker uses a client-server architecture. The Docker client talks to the Docker daemon, which does the heavy lifting of building, running, and distributing your Docker containers. The Docker client and daemon can run on the same system, or you can connect a Docker client to a remote Docker daemon.

Docker Container Architecture

The Docker client and daemon communicate using a REST API, over UNIX sockets or a network interface. Another Docker client is Docker Compose, that lets you work with applications consisting of a set of containers.

Docker daemon

Docker daemon (dockerd) listens for Docker API requests and manages Docker objects such as images, containers, networks, and volumes. A daemon can also communicate with other daemons to manage Docker services.

Docker Images

An Docker image is a read-only template with instructions for creating a Docker container. Often, an image is based on another image, with some additional customization. For example, you may build an image which is based on the ubuntu image, but installs the Apache web server and your application, as well as the configuration details needed to make your application run.

Docker image is a file used to execute code in a Docker container. Docker images act as a set of instructions to build a Docker container, like a template. Docker images also act as the starting point when using Docker. An image is comparable to a snapshot in virtual machine (VM) environments.

Docker Container Image

Docker is used to create, run and deploy applications in containers. A Docker image contains application code, libraries, tools, dependencies and other files needed to make an application run. When a user runs an image, it can become one or many instances of a container.

Docker Container image commands

According to Docker, there are sets of primary Docker image commands, categorized as child commands; some include the following:

  • docker image build. Builds an image from a Dockerfile.
  • docker image inspect. Displays information on one or more images.
  • docker image load. Loads an image from a tar archive or streams for receiving or reading input (STDIN).
  • docker image prune. Removes unused images.
  • docker image pull. Pulls an image or a repository from a registry.
  • docker image push. Pushes an image or a repository to a registry.
  • docker image rm. Removes one or more images.
  • docker image save. Saves one or more images to a tar archive (streamed to STDOUT by default).
  • docker image tag. Creates a tag TARGET_IMAGE that refers to SOURCE_IMAGE.

Docker Container Orcas Questions & Answers 2021

1) Docker images can be sent to registry by using __.
Select the best answer from given options below
a) docker push
b) docker send
c) docker pull
d) docker publish

Correct Answer of above question is : a) docker push

2) The following are components of Docker Engine, except_______
Select the best answer from given options below
a) REST API
b) Docker Daemon
c) None of the options
d) Command Line Interface

Correct Answer of above question is : c) None of the options

3) Docker hub images can be accessed at _.
Select the best answer from given options below
a) index.docker
b) None of the options
c) index.docker.io
d) docker

Correct Answer of above question is : c) index.docker.io

4) Docker Daemon and Docker Client use the same binary.
Select the best answer from given options below
a) True
b) False

Correct Answer of above question is : a) True

5) Running Docker containers can be checked by using___________.
Select the best answer from given options below
a) docker ps
b) docker cs

Correct Answer of above question is : a) docker ps

6) What is Docker Daemon?
Select the best answer from given options below
a) It is the latest feature added to Docker.
b) It is the unauthorized access to the image content.
c) It is a type of malware in Docker.
d) It is a continuous long-running program responsible for managing containers.

Correct Answer of above question is : d) It is a continuous long-running program responsible for managing containers.

7) Container can alter host filesystem without any restriction.
Select the best answer from given options below
a) True
b) False

Correct Answer of above question is : a) True

8) You can search for Docker images by using __.
Select the best answer from given options below
a) docker search imageName
b) docker searchfor imageName
c) docker pull image
d) docker find imageName

Correct Answer of above question is : a) docker search imageName

9) What is the name of the virtual Ethernet bridge that is created at the start of Docker Daemon?
Select the best answer from given options below
a) docker1
b) docker00
c) docker2
d) docker0

Correct Answer of above question is : d) docker0

10) Which of the following statements is true about containerization?
Select the best answer from given options below
a) Response time of the VM boosts.
b) Container consumes very less memory.
c) All the options
d) Docker containers do not have a complete OS with them.

Correct Answer of above question is : c) All the options

11) Docker Networking is needed while working on Docker _.
Select the best answer from given options below
a) on a small scale
b) in real-time on a large scale

Correct Answer of above question is : b) in real-time on a large scale

12) Application running in a VM is hidden from the host OS with the help of Hypervisor/VMM.
Select the best answer from given options below
a) True
b) False

Correct Answer of above question is : a) True

13) Docker Daemon does not require root privileges to run.
Select the best answer from given options below
a) False
b) True

Correct Answer of above question is : a) False

14) Which of the following is the correct method of exporting a TAR file?
Select the best answer from given options below
a) docker exampleImage < exampleImage.tar
b) docker exampleImage.zip < exampleImage.tar
c) docker export exampleImage < exampleImage.tar
d) docker exampleImage.tar < exampleImage

Correct Answer of above question is : c) docker export exampleImage < exampleImage.tar

15) To get help on a topic in Docker, you can use __.
Select the best answer from given options below
a) docker –help topicName
b) docker topicName –help

Correct Answer of above question is : b) docker topicName –help

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