Search test library by skills or roles
⌘ K

Docker Online Test

The Docker test uses scenario-based MCQs to evaluate candidates on their proficiency in working with Docker containers, their knowledge of Docker architecture, Docker command-line interface, Dockerfile syntax, Docker networking, Docker volumes, and Docker Compose. These key skills/topics are important for evaluating a candidate's ability to deploy and manage applications using Docker.

Covered skills:

  • Docker basics
  • Docker images
  • Docker containers
  • Docker networking
  • Docker volumes
  • Docker compose
  • Docker swarm
  • Docker security
  • Docker orchestration
  • Docker troubleshooting
Get started for free
Preview questions

About the Docker Test


The Docker Online Test helps recruiters and hiring managers identify qualified candidates from a pool of resumes, and helps in taking objective hiring decisions. It reduces the administrative overhead of interviewing too many candidates and saves time by filtering out unqualified candidates at the first step of the hiring process.

The test screens for the following skills that hiring managers look for in candidates:

  • Ability to understand and explain the basics of Docker
  • Ability to create, manage, and customize Docker images
  • Ability to launch, manage, and troubleshoot Docker containers
  • Ability to configure and manage Docker networking
  • Ability to work with Docker volumes and data persistence
  • Ability to use Docker Compose for multi-container applications
  • Ability to deploy and manage services using Docker Swarm
  • Ability to implement security measures in Docker environment
  • Ability to understand and implement Docker orchestration
  • Ability to troubleshoot common issues in Docker environment

1200+ customers in 80 countries


Use Adaface tests trusted by recruitment teams globally. Adaface skill assessments measure on-the-job skills of candidates, providing employers with an accurate tool for screening potential hires.

customers in 75 countries
Get started for free
Preview questions

Non-googleable questions


We have a very high focus on the quality of questions that test for on-the-job skills. Every question is non-googleable and we have a very high bar for the level of subject matter experts we onboard to create these questions. We have crawlers to check if any of the questions are leaked online. If/ when a question gets leaked, we get an alert. We change the question for you & let you know.

How we design questions

These are just a small sample from our library of 15,000+ questions. The actual questions on this Docker Test will be non-googleable.

🧐 Question

Medium

Docker Multistage Build Analysis
Multistage Builds
Optimization
Dockerfile Syntax
Solve
Consider the following Dockerfile, which utilizes multistage builds. The aim is to build a lightweight, optimized image that just runs the application.
 image
The Dockerfile first defines a base image that includes Node.js and npm, then it creates an intermediate image to install the npm dependencies. Afterwards, it runs the tests in another stage and finally, creates the release image.

Which of the following statements are true?

A: The final image will include the test scripts.
B: If a test fails, the final image will not be created.
C: The node_modules directory in the final image comes from the base image.
D: The final image will only contain the necessary application files and dependencies.
E: If the application's source code changes, only the release stage needs to be rebuilt.

Easy

Docker Networking and Volume Mounting Interplay
Networking
Volume Mounting
Docker Networking
Solve
You have two docker containers, X and Y. Container X is running a web service listening on port 8080, and container Y is supposed to consume this service. Both containers are created from images that don't have any special network configurations.

Container X has a Dockerfile as follows:
 image
And, you build and run it with the following commands:
 image
Container Y is also running alpine with python installed, and it's supposed to read data from the `/app/data` directory and send a GET request to `http://localhost:8080` every 5 minutes. The Dockerfile for container B is:
 image
And you run it with:
 image
Assuming all the python scripts work perfectly and firewall isn't blocking any connections, you find that container Y can't access the web service of container X via `http://localhost:8080` and also it can't read the data in `/app/data` directory. What could be the potential reason(s)?
A: Y can't access X's web service because they're in different Docker networks.
B: Y can't read the data because the volume is not shared correctly.
C: Both A and B are correct.
D: Both A and B are incorrect.

Medium

Dockerfile Optimization
Dockerfile
Multi-stage builds
Layer Caching
Solve
You have been asked to optimize a Dockerfile for a Python application that involves a heavy dependency installation. Here is the Dockerfile you are starting with:
 image
Given that the application's source code changes frequently but the dependencies listed in requirements.txt rarely change, how can you optimize this Dockerfile to take advantage of Docker's layer caching, reducing the build time?
A: Move the `RUN pip install` command to before the `COPY` command.
B: Change `COPY . /app` to `COPY ./app.py /app` and move the `RUN pip install` command to before the `COPY` command.
C: Add `RUN pip cache purge` before `RUN pip install`.
D: Replace the base image with `python:3.8-slim`.
E: Implement multi-stage builds.

Medium

Dockerfile Updates
Cache
Docker Cache Strategies
Solve
Check the following Dockerfile used for a project (STAGE 1):
 image
We created an image from this Dockerfile on Dec 14 2021. A couple of weeks after Dec 14 2021, Ubuntu released new security updates to their repository. After 2 months, we modified the file (STAGE 2):
 image
Couple of weeks later, we further modified the file to add a local file ada.txt to /ada.txt (STAGE 3): (Note that ada.txt exists in /home/adaface and the dockerfile exists in /home/code folders)
 image
Pick correct statements:

A: If we run “docker build .” at STAGE 2, new Ubuntu updates will be fetched because apt-get update will be run again since cache is invalidated for all lines/layers of Dockerfile when a new line is added.
B: If we run “docker build .” at STAGE 2, new Ubuntu updates will not be fetched since cache is invalidated only for last two lines of the updated Dockerfile. Since the first two commands remain the same, cached layers are re-used skipping apt get update.
C: To skip Cache, “docker build -no-cache .” can be used at STAGE 2. This will ensure new Ubuntu updates are picked up.
D: Docker command “docker build .” at STAGE 3 works as expected and adds local file ada.txt to the image.
E: Docker command “docker build .” at STAGE 3 gives an error “no such file or directory” since /home/adaface/ada.txt is not part of the Dockerfile context.

Medium

Efficient Dockerfile
Dockerfile
Dockerfile Syntax
Containerization
Resource Optimization
Solve
Review the following Dockerfiles that work on two projects (project and project2):
 image
All Docker files have the same end result:

- ‘project’ is cloned from git. After running few commands, ‘project’ code is removed.
- ‘project2’ is copied from file system and permissions to the folder is changed.
Pick the correct statements:

A: File 1 is the most efficient of all.
B: File 2 is the most efficient of all.
C: File 3 is the most efficient of all.
D: File 4 is the most efficient of all.
E: Merging multiple RUN commands into a single RUN command is efficient for ‘project’ since each RUN command creates a new layer with changed files and folders. Deleting files with RUN only marks these files as deleted but does not reclaim disk space. 
F: Copying ‘project2’ files and changing ownership in two separate commands will result in two layers since Docker duplicates all the files twice.
🧐 Question🔧 Skill

Medium

Docker Multistage Build Analysis
Multistage Builds
Optimization
Dockerfile Syntax

3 mins

Docker
Solve

Easy

Docker Networking and Volume Mounting Interplay
Networking
Volume Mounting
Docker Networking

3 mins

Docker
Solve

Medium

Dockerfile Optimization
Dockerfile
Multi-stage builds
Layer Caching

2 mins

Docker
Solve

Medium

Dockerfile Updates
Cache
Docker Cache Strategies

2 mins

Docker
Solve

Medium

Efficient Dockerfile
Dockerfile
Dockerfile Syntax
Containerization
Resource Optimization

2 mins

Docker
Solve
🧐 Question🔧 Skill💪 Difficulty⌛ Time
Docker Multistage Build Analysis
Multistage Builds
Optimization
Dockerfile Syntax
Docker
Medium3 mins
Solve
Docker Networking and Volume Mounting Interplay
Networking
Volume Mounting
Docker Networking
Docker
Easy3 mins
Solve
Dockerfile Optimization
Dockerfile
Multi-stage builds
Layer Caching
Docker
Medium2 mins
Solve
Dockerfile Updates
Cache
Docker Cache Strategies
Docker
Medium2 mins
Solve
Efficient Dockerfile
Dockerfile
Dockerfile Syntax
Containerization
Resource Optimization
Docker
Medium2 mins
Solve
Get started for free
Preview questions
love bonito

With Adaface, we were able to optimise our initial screening process by upwards of 75%, freeing up precious time for both hiring managers and our talent acquisition team alike!

Brandon Lee, Head of People, Love, Bonito

Brandon
love bonito

It's very easy to share assessments with candidates and for candidates to use. We get good feedback from candidates about completing the tests. Adaface are very responsive and friendly to deal with.

Kirsty Wood, Human Resources, WillyWeather

Brandon
love bonito

We were able to close 106 positions in a record time of 45 days! Adaface enables us to conduct aptitude and psychometric assessments seamlessly. My hiring managers have never been happier with the quality of candidates shortlisted.

Amit Kataria, CHRO, Hanu

Brandon
love bonito

We evaluated several of their competitors and found Adaface to be the most compelling. Great library of questions that are designed to test for fit rather than memorization of algorithms.

Swayam Narain, CTO, Affable

Brandon

Why you should use Pre-employment Docker Online Test?

The Docker Test makes use of scenario-based questions to test for on-the-job skills as opposed to theoretical knowledge, ensuring that candidates who do well on this screening test have the relavant skills. The questions are designed to covered following on-the-job aspects:

  • Understanding Docker basics and concepts
  • Creating, managing and deploying Docker images
  • Working with Docker containers and their lifecycle
  • Understanding Docker networking and communication between containers
  • Managing Docker volumes and persistent data
  • Working with Docker Compose to define and manage multi-container applications
  • Deploying and managing services using Docker Swarm
  • Implementing Docker security practices and policies
  • Orchestrating Docker containers for large-scale deployments

Once the test is sent to a candidate, the candidate receives a link in email to take the test. For each candidate, you will receive a detailed report with skills breakdown and benchmarks to shortlist the top candidates from your pool.

What topics are covered in the Docker Online Test?

Docker basics: Docker basics include understanding the fundamental concepts and components of Docker, such as images, containers, and the Docker daemon. It is important to measure this skill in the test to assess the candidate's knowledge and familiarity with Docker as a containerization technology.

Docker images: Docker images are the building blocks of containers, containing everything needed to run an application. This skill should be measured to evaluate the candidate's understanding of image creation, version control, and distribution, which are crucial for efficient and reliable container deployments.

Docker containers: Docker containers are lightweight, isolated environments that run applications. Measuring this skill helps assess the candidate's ability to manage and configure containers, including network and storage settings, as well as their knowledge of containerization principles and best practices.

Docker networking: Docker networking involves creating and managing network connections between containers and other resources. Testing this skill allows the recruiter to gauge the candidate's proficiency in configuring and troubleshooting Docker networks, understanding network modes, and implementing DNS and load balancing in containerized environments.

Docker volumes: Docker volumes provide persistent storage for containers, allowing data to be stored and shared between different container instances. Evaluating this skill helps determine the candidate's knowledge of volume management, data persistence strategies, and how to handle filesystem permissions and ownership within containers.

Docker compose: Docker Compose is a tool for defining and running multi-container applications. Measuring this skill is essential in assessing the candidate's ability to write and deploy Docker Compose files, which define the services, networks, and volumes required for complex containerized applications.

Docker swarm: Docker Swarm is a native clustering and orchestration solution for Docker. Testing this skill evaluates the candidate's understanding of swarm mode, including creating and managing swarm clusters, deploying services, and scaling applications across multiple Docker nodes for high availability.

Docker security: Docker security focuses on implementing best practices and features to secure Docker environments and containerized applications. Measuring this skill helps gauge the candidate's knowledge of Docker security mechanisms, such as user namespaces, image scanning, container isolation, network security, and vulnerability management.

Docker orchestration: Docker orchestration involves managing and coordinating multiple Docker containers and services in a distributed environment. Evaluating this skill allows recruiters to determine the candidate's familiarity with Docker orchestration tools like Kubernetes or Docker Swarm, as well as their ability to configure and monitor containerized applications at scale.

Docker troubleshooting: Docker troubleshooting entails identifying and resolving issues that may arise in Docker environments, such as container misconfigurations, networking problems, or performance bottlenecks. Measuring this skill helps assess the candidate's ability to effectively diagnose and troubleshoot problems in containerized applications, ensuring smooth and reliable operations.

Full list of covered topics

The actual topics of the questions in the final test will depend on your job description and requirements. However, here's a list of topics you can expect the questions for Docker Test to be based on.

Docker installation
Docker architecture
Dockerfile
Docker image layers
Docker container lifecycle
Docker networking modes
Docker volume management
Docker Compose YAML syntax
Docker Swarm setup and configuration
Docker service scaling
Docker security best practices
Docker orchestration tools
Docker troubleshooting techniques
Docker CLI commands
Docker registry
Docker container logs
Docker container environment variables
Docker container health checks
Docker container resource management
Docker container intercommunication
Docker image tagging and versioning
Docker image optimization techniques
Docker network configurations
Docker volume backup and restore
Docker Compose environment variables
Docker Swarm service discovery
Docker Swarm node management
Docker security scanning
Docker orchestration patterns
Docker troubleshooting tools
Docker command line options
Docker image caching
Docker container startup options
Docker container environment isolation
Docker image registry authentication
Docker network routing
Docker volume permissions
Docker Compose deployment strategies
Docker Swarm load balancing
Docker security auditing
Docker container resource monitoring
Docker image layers optimization
Docker network overlays
Docker volume drivers
Docker Compose scaling
Docker Swarm service updates
Docker security policies
Docker orchestration rollback
Docker container log management
Docker container networking troubleshooting
Docker image vulnerability scanning
Docker Compose network configuration
Docker Swarm health checks
Docker security hardening
Docker container process monitoring
Docker image size reduction
Docker network firewall settings
Docker volume backup strategies
Docker Compose service discovery
Docker Swarm service constraints
Docker security compliance
Docker container performance optimization
Docker image layer caching
Docker network load balancing
Docker volume encryption
Docker Compose volume management
Docker Swarm secret management
Docker security vulnerabilities
Docker container high availability
Docker image versioning strategies
Docker network traffic control
Docker volume replication
Docker Compose environment variable substitution
Docker Swarm stack deployment
Docker security auditing tools
Docker container resource isolation
Docker image storage optimization
Docker network DNS resolution
Docker volume size management
Docker Compose service scalability
Docker Swarm multi-manager setup
Docker security incident response
Docker container log rotation
Docker image source control integration
Docker network latency optimization
Docker volume performance tuning
Docker Compose dependency management
Docker Swarm service rolling updates
Docker security compliance scanning
Docker container debug logging
Docker image multi-arch support
Docker network gateway configuration
Docker volume snapshotting
Docker Compose container linking
Docker Swarm multi-cluster setup
Docker security access control
Docker container log aggregation
Docker image artifact management

What roles can I use the Docker Online Test for?

  • Docker Developer
  • DevOps Engineer
  • Site Reliability Engineer
  • Infrastructure Engineer
  • Containerization Specialist
  • Backend Developer

How is the Docker Online Test customized for senior candidates?

For intermediate/ experienced candidates, we customize the assessment questions to include advanced topics and increase the difficulty level of the questions. This might include adding questions on topics like

  • Designing and implementing Docker infrastructure
  • Building resilient and scalable Docker architecture
  • Implementing container orchestration with Kubernetes and Docker
  • Integrating Docker with CI/CD pipelines
  • Managing Docker in cloud environments
  • Monitoring and logging Docker containers and applications
  • Implementing high availability and fault tolerance in Docker deployments
  • Automating Docker tasks using scripting and automation tools
  • Performing Docker image optimization and size reduction
  • Configuring and managing advanced Docker networking

Try the most advanced candidate assessment platform

ChatGPT Protection

Non-googleable Questions

Web Proctoring

IP Proctoring

Webcam Proctoring

MCQ Questions

Coding Questions

Typing Questions

Personality Questions

Custom Questions

Ready-to-use Tests

Custom Tests

Custom Branding

Bulk Invites

Public Links

ATS Integrations

Multiple Question Sets

Custom API integrations

Role-based Access

Priority Support

GDPR Compliance

Screen candidates in 3 easy steps

Pick a test from over 500+ tests

The Adaface test library features 500+ tests to enable you to test candidates on all popular skills- everything from programming languages, software frameworks, devops, logical reasoning, abstract reasoning, critical thinking, fluid intelligence, content marketing, talent acquisition, customer service, accounting, product management, sales and more.

Invite your candidates with 2-clicks

Make informed hiring decisions

Get started for free
Preview questions

Have questions about the Docker Hiring Test?

What is Docker Test?

The Docker Test evaluates candidates' proficiency with Docker, covering all fundamental and advanced topics. Recruiters and companies use this test to identify skilled individuals for roles requiring Docker expertise.

Can I combine Docker Test with Kubernetes questions?

Yes, recruiters can request a custom test that includes both Docker and Kubernetes questions. For more details on assessing Kubernetes skills, please check our Kubernetes Online Test.

What topics are evaluated in the Docker Test?

The Docker Test covers:

  • Docker basics
  • Docker images
  • Docker containers
  • Docker networking
  • Docker volumes
  • Docker compose
  • Docker swarm
  • Docker security
  • Docker orchestration
  • Docker troubleshooting
How to use Docker Test in my hiring process?

Use the Docker Test as a pre-screening tool at the start of your recruitment process. Add a link to the assessment in your job post or invite candidates by email. This helps find skilled candidates efficiently.

Can I test Docker and DevOps together in a test?

Yes, you can test both Docker and DevOps together. Combining these tests provides a comprehensive assessment. Check our DevOps Online Test for more information.

What are the main DevOps tests?

Our DevOps-related tests include:

Can I combine multiple skills into one custom assessment?

Yes, absolutely. Custom assessments are set up based on your job description, and will include questions on all must-have skills you specify. Here's a quick guide on how you can request a custom test.

Do you have any anti-cheating or proctoring features in place?

We have the following anti-cheating features in place:

  • Non-googleable questions
  • IP proctoring
  • Screen proctoring
  • Web proctoring
  • Webcam proctoring
  • Plagiarism detection
  • Secure browser
  • Copy paste protection

Read more about the proctoring features.

How do I interpret test scores?

The primary thing to keep in mind is that an assessment is an elimination tool, not a selection tool. A skills assessment is optimized to help you eliminate candidates who are not technically qualified for the role, it is not optimized to help you find the best candidate for the role. So the ideal way to use an assessment is to decide a threshold score (typically 55%, we help you benchmark) and invite all candidates who score above the threshold for the next rounds of interview.

What experience level can I use this test for?

Each Adaface assessment is customized to your job description/ ideal candidate persona (our subject matter experts will pick the right questions for your assessment from our library of 10000+ questions). This assessment can be customized for any experience level.

Does every candidate get the same questions?

Yes, it makes it much easier for you to compare candidates. Options for MCQ questions and the order of questions are randomized. We have anti-cheating/ proctoring features in place. In our enterprise plan, we also have the option to create multiple versions of the same assessment with questions of similar difficulty levels.

I'm a candidate. Can I try a practice test?

No. Unfortunately, we do not support practice tests at the moment. However, you can use our sample questions for practice.

What is the cost of using this test?

You can check out our pricing plans.

Can I get a free trial?

Yes, you can sign up for free and preview this test.

I just moved to a paid plan. How can I request a custom assessment?

Here is a quick guide on how to request a custom assessment on Adaface.

View sample scorecard


Along with scorecards that report the performance of the candidate in detail, you also receive a comparative analysis against the company average and industry standards.

View sample scorecard
customers across world
Join 1200+ companies in 80+ countries.
Try the most candidate friendly skills assessment tool today.
g2 badges
Ready to use the Adaface Docker Test?
Ready to use the Adaface Docker Test?
logo
40 min tests.
No trick questions.
Accurate shortlisting.
Terms Privacy Trust Guide
ada
Ada
● Online
Previous
Score: NA
Next
✖️