Slide 1
Most trusted JOB oriented professional program
DevOps Certified Professional (DCP)

Take your first step into the world of DevOps with this course, which will help you to learn about the methodologies and tools used to develop, deploy, and operate high-quality software.

Slide 2
DevOps to DevSecOps – Learn the evolution
DevSecOps Certified Professional (DSOCP)

Learn to automate security into a fast-paced DevOps environment using various open-source tools and scripts.

Slide 2
Get certified in the new tech skill to rule the industry
Site Reliability Engineering (SRE) Certified Professional

A method of measuring and achieving reliability through engineering and operations work – developed by Google to manage services.

Slide 2
Master the art of DevOps
Master in DevOps Engineering (MDE)

Get enrolled for the most advanced and only course in the WORLD which can make you an expert and proficient Architect in DevOps, DevSecOps and Site Reliability Engineering (SRE) principles together.

Slide 2
Gain expertise and certified yourself
Azure DevOps Solutions Expert

Learn about the DevOps services available on Azure and how you can use them to make your workflow more efficient.

Slide 3
Learn and get certified
AWS Certified DevOps Professional

Learn about the DevOps services offered by AWS and how you can use them to make your workflow more efficient.

previous arrow
next arrow

Docker Interview Questions and Answer Part – 33

Spread the Knowledge

Which of the following best decribes a Docker Image?

  • A read-write template for starting one or more containers
  • A point-in-time snapshot of a container used for backups
  • A data volume that can be mounted inside of a container
  • A read-only template for starting one or more containers (Ans)

You have two services running on a Swarm, but they cannot find each other by name. Which of the following could be the reason why?

  • They are on different overlay networks (Ans)
  • They were not manually registered with the Swarm DNS when they were created
  • Service discovery only works on bridge/NAT networks
  • You did not create the Swarm DNS

Which of the following is a loose definition of a Docker container?

  • A VM running a shared kernel with resource limits applied
  • A unikernel running on a hypervisor with resource limits applied
  • An isolated area of an Operating System with resource limits applied (Ans)

What will happen if you start a new container or service and specify a volume that does not currently exist?

  • You will be prompted to create the new volume
  • The command will complete but the container/service will fail to start
  • The command will fail
  • Docker will create the volume for you (Ans)

What are the base requirements to be able to use Docker Secrets?

  • Swarm mode and an external CA
  • Swarm mode and self-encrypting disks for the cluster store
  • Docker in Swarm mode (Ans)
  • Docker

Which of the following are top-level keys in a stack file (Compose v3 file)?

  • Version, deployments, networks, volumes
  • Version and services
  • Version, services, networks, volumes (Ans)
  • Services, pods, networks, volumes

Which of the following is an advantage of Multi-stage Builds?

  • Multi-platform images
  • Better image documentation
  • Faster image builds
  • Smaller images (Ans)

Which of the following is a recommended number of Swarm managers for high availability?

  • 4
  • 3 (Ans)
  • 2

Which of the following best describes a Bridge (NAT on Windows) network in Docker?

  • Token-ring
  • Multi-host overlay network
  • A single-host network (Ans)

How does the HRM know how to route traffic to the correct service?

  • iptables rules
  • It inspects HTTP host headers (Ans)
  • DNS labels
  • Custom load balancer rules

By default, where are Docker daemon logs sent to on a Linux system running systemd?

  • syslog
  • The Linux event viewer
  • journald (Ans)

Which of the following is a major goal of Docker volumes?

  • Data replication
  • Data encryption at-rest
  • Object storage
  • Persistent data (Ans)
  • RAID

Which are the two major kernel building blocks that containers are built from?

  • Capabilities and seccomp
  • Namespaces and kernels
  • Namespaces and control groups (Ans)
  • Capabilities and control groups

Which of the following is a recommended best practice?

  • Keep your images small (Ans)
  • Never use the latest image in a repo
  • Use large images containing lots of tools
  • Only use Docker Hub

Where are Secrets mounted on Linux-based Docker hosts?

  • An encrypted volume mounted at /run/secrets
  • An in memory (tempfs) volume at /run/secrets (Ans)
  • initramfs
  • Solid state volume

How are Docker Secrets created on the command line?

  • docker secret create (Ans)
  • docker swarm secret create
  • They cannot be created on the command line

Which of the following is the best high-level description of a Swarm?

  • A secure cluster of Docker nodes (Ans)
  • A tightly-coupled cluster of Docker container
  • A secure cluster of Docker containers
  • I tightly-coupled cluster of Linux nodes

What is the atomic unit of scheduling in Docker?

  • The service
  • The container (Ans)
  • The pod
  • The stack
  • The swarm

Which of the following commands lets you deploy a Docker Stack called stack1 using a Compose file called myapp.yml?

  • docker service deploy -c myapp.yml stack1
  • docker stack deploy -c myapp.yml stack1 (Ans)
  • docker stack deploy stack1 myapp.yml
  • docker service deploy stack1 myapp.yml
Rajesh Kumar