🚀 DevOps & SRE Certification Program 📅 Starting: 1st of Every Month 🤝 +91 8409492687 🔍 Contact@DevOpsSchool.com

Upgrade & Secure Your Future with DevOps, SRE, DevSecOps, MLOps!

We spend hours on Instagram and YouTube and waste money on coffee and fast food, but won’t spend 30 minutes a day learning skills to boost our careers.
Master in DevOps, SRE, DevSecOps & MLOps!

Learn from Guru Rajesh Kumar and double your salary in just one year.


Get Started Now!

Docker

Docker Interview Questions and Answer Part – 23

January 21, 2020 comments off

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
  • Capabilities and control groups (Ans)

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

Which of the following open-source tools is the underlying technology for Docker Swarm?

  • containerd
  • SwarmKit (Ans)
  • Kubernetes
  • InfraKit
  • The Docker daemon

Docker UCP implements RBAC via Grants. Which of the following make up a Grant?

  • Subjects, roles, and nodes
  • Subjects, roles, and collections (Ans)
  • Roles and collections

Which of the following built-in Docker networks creates a single layer-2 container-only network across multiple Docker hosts that can be on different underlying networks?

  • Bridge
  • MACVLAN
  • Overlay (Ans)
  • NAT

Which Docker command shows the network ports that a container is exposed on?

  • docker container ports
  • docker port (Ans)
  • docker network –port

What happens when you perform a docker volume rm against a volume attached to a running container?

  • The command will fail (Ans)
  • The volume will be deleted
  • The volume and the container will be deleted
  • You will be asked to confirm the command

Which set of container-related Linux tools did Docker’s libcontainer replace?

  • LXD
  • libc
  • AUFS
  • LXC (Ans)

How can you make a Docker Secret available to a standalone container (not a service replica)?

  • You cannot (Ans)
  • Make sure it us running on an overlay network
  • Make sure it is on a node running in Swarm mode

Which Docker technology allows you to manage an entire application comprising multiple Docker Services?

  • Service Mesh
  • Stacks (Ans)
  • Bundles

Which are the two major Docker container orchestrators?

  • Swarm and VMware vSphere
  • Swarm and Marathon
  • Swarm and Kubernetes (Ans)
  • Kubernetes and VMware vSphere

Certification Courses

DevOpsSchool has introduced a series of professional certification courses designed to enhance your skills and expertise in cutting-edge technologies and methodologies. Whether you are aiming to excel in development, security, or operations, these certifications provide a comprehensive learning experience. Explore the following programs:

DevOps Certification, SRE Certification, and DevSecOps Certification by DevOpsSchool

Explore our DevOps Certification, SRE Certification, and DevSecOps Certification programs at DevOpsSchool. Gain the expertise needed to excel in your career with hands-on training and globally recognized certifications.