{"id":72444,"date":"2019-08-09T10:34:53","date_gmt":"2019-08-09T10:34:53","guid":{"rendered":"https:\/\/www.whizlabs.com\/blog\/?p=72444"},"modified":"2021-01-11T08:34:48","modified_gmt":"2021-01-11T08:34:48","slug":"top-docker-interview-questions","status":"publish","type":"post","link":"https:\/\/www.whizlabs.com\/blog\/top-docker-interview-questions\/","title":{"rendered":"Top 25 Docker Interview Questions"},"content":{"rendered":"<p><em>Preparing for a Docker Interview? Here we bring the top 25 Docker Interview Questions that will help you to ace the interview.<\/em><\/p>\n<p class=\"p1\" style=\"text-align: justify;\"><span class=\"s1\">Businesses want promising growth with the successful completion of projects. This notion is improved now with the demand for faster and smoother processes. Therefore, there is a huge demand for new and highly functional tools that can support business functions. One such tool is Docker, which is used for packing, shipping, and running applications on containers. <\/span><\/p>\n<p class=\"p1\" style=\"text-align: justify;\"><span class=\"s1\">Towards the end of 2017, Docker had seen over 8 billion container image downloads. This spurred a huge demand for professionals who have <a href=\"https:\/\/www.whizlabs.com\/docker-certified-associate\/\" target=\"_blank\" rel=\"noopener\">Docker certification<\/a>. So, candidates started looking for docker interview questions to make the most of all job opportunities. The application container market is estimated to reach a total value of $2.7 billion by 2020.<\/span><\/p>\n<p><a href=\"https:\/\/www.whizlabs.com\/docker-certified-associate\/online-course\/\" target=\"_blank\" rel=\"noopener noreferrer\"><img decoding=\"async\" class=\"aligncenter wp-image-72445 size-full\" src=\"https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2019\/08\/docker_OC_banner-1-1.gif\" alt=\"Docker Online Course\" width=\"728\" height=\"90\" \/><\/a><\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_76 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #ea7e02;color:#ea7e02\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #ea7e02;color:#ea7e02\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.whizlabs.com\/blog\/top-docker-interview-questions\/#Frequently_Asked_Docker_Interview_Questions_and_Answers\" >Frequently Asked Docker Interview Questions and Answers<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.whizlabs.com\/blog\/top-docker-interview-questions\/#1_What_is_docker\" >1. What is docker?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.whizlabs.com\/blog\/top-docker-interview-questions\/#2_What_are_the_containers\" >2. What are the containers?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.whizlabs.com\/blog\/top-docker-interview-questions\/#3_What_are_the_components_of_Docker_architecture\" >3. What are the components of Docker architecture?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.whizlabs.com\/blog\/top-docker-interview-questions\/#4_Can_you_illustrate_the_docker_container_lifecycle\" >4. Can you illustrate the docker container lifecycle?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.whizlabs.com\/blog\/top-docker-interview-questions\/#5_Is_it_possible_to_build_environment-agnostic_systems_with_Docker\" >5. Is it possible to build environment-agnostic systems with Docker?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.whizlabs.com\/blog\/top-docker-interview-questions\/#6_What_is_the_difference_between_Docker_and_virtual_machine\" >6. What is the difference between Docker and virtual machine?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.whizlabs.com\/blog\/top-docker-interview-questions\/#7_Define_docker_swarm\" >7. Define docker swarm.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.whizlabs.com\/blog\/top-docker-interview-questions\/#8_What_are_Docker_images\" >8. What are Docker images?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.whizlabs.com\/blog\/top-docker-interview-questions\/#9_Did_Docker_pioneer_container_technology\" >9. Did Docker pioneer container technology?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.whizlabs.com\/blog\/top-docker-interview-questions\/#10_What_is_a_Dockerfile\" >10. What is a Dockerfile?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.whizlabs.com\/blog\/top-docker-interview-questions\/#11_If_you_exit_a_container_accidentally_will_you_lose_all_the_work\" >11. If you exit a container accidentally, will you lose all the work?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.whizlabs.com\/blog\/top-docker-interview-questions\/#12_How_can_you_find_the_status_of_a_Docker_container\" >12. How can you find the status of a Docker container?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.whizlabs.com\/blog\/top-docker-interview-questions\/#13_What_are_Docker_objects\" >13. What are Docker objects?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.whizlabs.com\/blog\/top-docker-interview-questions\/#14_Do_you_know_about_Namespaces_in_Docker\" >14. Do you know about Namespaces in Docker?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.whizlabs.com\/blog\/top-docker-interview-questions\/#15_What_is_the_basic_and_crucial_requirement_for_creating_a_Docker_container\" >15. What is the basic and crucial requirement for creating a Docker container?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.whizlabs.com\/blog\/top-docker-interview-questions\/#16_Which_factors_determine_the_number_of_containers_you_can_run\" >16. Which factors determine the number of containers you can run?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/www.whizlabs.com\/blog\/top-docker-interview-questions\/#17_What_is_the_difference_between_Hypervisor_and_Docker\" >17. What is the difference between Hypervisor and Docker?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/www.whizlabs.com\/blog\/top-docker-interview-questions\/#18_Explain_the_difference_between_Docker_image_and_layer\" >18. Explain the difference between Docker image and layer.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/www.whizlabs.com\/blog\/top-docker-interview-questions\/#19_How_can_you_monitor_Docker_in_production\" >19. How can you monitor Docker in production?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/www.whizlabs.com\/blog\/top-docker-interview-questions\/#20_What_are_the_default_networks_in_Docker\" >20. What are the default networks in Docker?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/www.whizlabs.com\/blog\/top-docker-interview-questions\/#21_What_is_Docker_Compose\" >21. What is Docker Compose?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/www.whizlabs.com\/blog\/top-docker-interview-questions\/#22_How_can_you_check_the_Docker_Client_and_Docker_server_version\" >22. How can you check the Docker Client and Docker server version?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/www.whizlabs.com\/blog\/top-docker-interview-questions\/#23_How_can_I_start_stop_and_kill_a_container\" >23. How can I start, stop and kill a container?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/www.whizlabs.com\/blog\/top-docker-interview-questions\/#24_How_to_build_a_Dockerfile\" >24. How to build a Dockerfile?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/www.whizlabs.com\/blog\/top-docker-interview-questions\/#25_What_are_the_notable_application_areas_for_Docker\" >25. What are the notable application areas for Docker?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"p1\" style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Frequently_Asked_Docker_Interview_Questions_and_Answers\"><\/span><span class=\"s1\">Frequently Asked Docker Interview Questions and Answers<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"p1\" style=\"text-align: justify;\"><span class=\"s1\">It can be noted that software engineers, DevOps engineers, and information architects with Docker skills are in high demand. So, this article is intended to help the Docker professionals with their docker interview preparation. You will find 25 of the top docker interview questions with answers in this article. <\/span><\/p>\n<h3 class=\"p1\" style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"1_What_is_docker\"><\/span><span class=\"s1\">1. What is docker?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"p1\" style=\"text-align: justify;\"><span class=\"s1\">Answer: This is probably one of the simplest docker interview questions. However, many candidates are focused on the study and practice of different Docker components. In such cases, they miss out on the actual definition of Docker. Docker is defined as a tool designed for developers to create and maintain their apps in an organized manner. <\/span><\/p>\n<p class=\"p1\" style=\"text-align: justify;\"><span class=\"s1\">Containers facilitate the effectiveness and organization of applications in Docker. Developers could add their app and related data in the container and send it to the destination. Docker implements the Linux kernel for sending the packaged app to the destination from the developer. There is no need for an additional operating system for application development with Docker. <\/span><\/p>\n<p class=\"p2\" style=\"text-align: justify;\"><span class=\"s2\">Learn more about Docker Fundamentals here: <a href=\"https:\/\/www.whizlabs.com\/blog\/docker-fundamentals\/\" target=\"_blank\" rel=\"noopener noreferrer\"><span class=\"s3\">https:\/\/www.whizlabs.com\/blog\/docker-fundamentals\/<\/span><\/a><\/span><\/p>\n<h3 class=\"p1\" style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"2_What_are_the_containers\"><\/span><span class=\"s1\">2. What are the containers?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"p1\" style=\"text-align: justify;\"><span class=\"s1\">Answer: This can be considered as one of the most common docker interview questions. Candidates can expect multiple questions regarding containers, and this is the starting point for all. Containers are the basic software unit that stores the code and related dependencies. They help in smooth, quick and reliable deployment of applications from one computing landscape to another. Containers are created with the help of a Docker image. They have every element needed for running an application such as system tools, runtime, libraries, settings, and code. <\/span><\/p>\n<h3 class=\"p1\" style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"3_What_are_the_components_of_Docker_architecture\"><\/span><span class=\"s1\">3. What are the components of Docker architecture?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"p1\" style=\"text-align: justify;\"><span class=\"s1\">Answer: This is one of the best docker interview questions that you can find. The components of a Docker architecture are the host, client, and registry. The host contains the docker images, containers, and daemon. The daemon establishes a link with the registry. The docker images serve as application metadata and are stored in the Docker containers. A docker client is responsible for running operations for establishing communication with the host. The docker registry stores Docker images. There are two types of public registries, i.e. Docker Hub and Docker Cloud. <\/span><\/p>\n<h3 class=\"p1\" style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"4_Can_you_illustrate_the_docker_container_lifecycle\"><\/span><span class=\"s1\">4. Can you illustrate the docker container lifecycle?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"p1\" style=\"text-align: justify;\"><span class=\"s1\">Answer: You can find this question throughout your docker interview preparation journey. The lifecycle of the docker container starts with the creation of the container. Then it gradually progresses to running, pausing, unpausing and starting the container. The next steps involve stopping, restarting and killing the container. The final step is the destruction of the container. <\/span><\/p>\n<h3 class=\"p1\" style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"5_Is_it_possible_to_build_environment-agnostic_systems_with_Docker\"><\/span><span class=\"s1\">5. Is it possible to build environment-agnostic systems with Docker?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"p1\" style=\"text-align: justify;\"><span class=\"s1\">Answer: This can be one of the conceptual docker interview questions. As a response, you can simply state that three Docker features can help in building environment-agnostic systems. The three features are read-only file systems, volumes, and environment variable injection.<\/span><\/p>\n<h3 class=\"p1\" style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"6_What_is_the_difference_between_Docker_and_virtual_machine\"><\/span><span class=\"s1\">6. What is the difference between Docker and virtual machine?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"p1\" style=\"text-align: justify;\"><span class=\"s1\">Answer: This is one of the frequently asked docker interview questions. The response to this question is as follows:<\/span><\/p>\n<ul class=\"ul1\" style=\"text-align: justify;\">\n<li class=\"li1\"><span class=\"s1\">Every virtual machine runs its OS while Docker containers share the same kernel of the host. <\/span><\/li>\n<li class=\"li1\"><span class=\"s1\">Virtual machines boot in minutes while containers take only a few seconds to initiate.<\/span><\/li>\n<li class=\"li1\"><span class=\"s1\">An average laptop cannot run more than a couple of VMs. However, the same laptop could run many docker containers.<\/span><\/li>\n<li class=\"li1\"><span class=\"s1\">You would not find many VM snapshots. On the other hand, images or snapshots are created one over others in the form of layers. <\/span><\/li>\n<li class=\"li1\"><span class=\"s1\">The final response to one of the most common docker interview questions would be based on the use of resources. One set of VMDK or VMx files could be used for starting only one VM. In the case of Docker, one docker image can be used for starting multiple docker containers. <\/span><\/li>\n<\/ul>\n<h3 class=\"p1\" style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"7_Define_docker_swarm\"><\/span><span class=\"s1\">7. Define docker swarm.<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"p1\" style=\"text-align: justify;\"><span class=\"s1\">Answer: You can find this question on every list of docker interview questions. Docker swarm is the native tool designed for clustering and scheduling of Docker containers. Docker swarm is used for creating and managing a group of nodes in a single Virtual System (VS) or Docker.<\/span><\/p>\n<blockquote><p>Enroll Now:\u00a0<a href=\"https:\/\/www.whizlabs.com\/docker-swarm-basics\/\" target=\"_blank\" rel=\"noopener follow noreferrer\" data-wpel-link=\"internal\">Docker Swarm Basics Online Course<\/a><\/p><\/blockquote>\n<h3 class=\"p1\" style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"8_What_are_Docker_images\"><\/span><span class=\"s1\">8. What are Docker images?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"p1\" style=\"text-align: justify;\"><span class=\"s1\">Answer: This is also an important mention in the frequently asked docker interview questions. The docker image is defined as the source of the Docker container. The build command helps in creating images, and they could produce containers with the run command.<\/span><\/p>\n<h3 class=\"p1\" style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"9_Did_Docker_pioneer_container_technology\"><\/span><span class=\"s1\">9. Did Docker pioneer container technology?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"p1\" style=\"text-align: justify;\"><span class=\"s1\">Answer: This can be one of the confusing docker interview questions for candidates. The answer is no. Docker is a considerably new project. Many other development tools before docker offered containers. However, you can face follow-up questions with this one. You may be asked about the efficiency of Docker as compared to other tools. Here, you can point out to the cloud-based operations of Docker, which make it more adaptive and flexible. This clearly shows the efficiency of Docker in various scenarios that can arise in the course of the shipment or development process. <\/span><\/p>\n<h3 class=\"p1\" style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"10_What_is_a_Dockerfile\"><\/span><span class=\"s1\">10. What is a Dockerfile?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"p1\" style=\"text-align: justify;\"><span class=\"s1\">Answer: You can find this one as one of the best docker interview questions asked commonly. The answer refers to the basic function of Docker in which it sends applications in containers to the destination. Dockerfile is the set of instructions for the containers so that the programs could function properly by following the instructions.<\/span><\/p>\n<blockquote>\n<p class=\"p2\" style=\"text-align: justify;\"><span class=\"s2\">Also Read: <span class=\"s3\"><a href=\"https:\/\/www.whizlabs.com\/blog\/docker-certification-books\/\" target=\"_blank\" rel=\"noopener noreferrer\">Top 5 Docker Certification Preparation Books<\/a><\/span><\/span><\/p>\n<\/blockquote>\n<h3 class=\"p1\" style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"11_If_you_exit_a_container_accidentally_will_you_lose_all_the_work\"><\/span><span class=\"s1\">11. If you exit a container accidentally, will you lose all the work?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"p1\" style=\"text-align: justify;\"><span class=\"s1\">Answer: There is no chance of losing information, data or other parameters by accidentally exiting a container. However, if you use a specific command for deleting the container, then you lose your work.<\/span><\/p>\n<h3 class=\"p1\" style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"12_How_can_you_find_the_status_of_a_Docker_container\"><\/span><span class=\"s1\">12. How can you find the status of a Docker container?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"p1\" style=\"text-align: justify;\"><span class=\"s1\">Answer: The command \u201cdocker ps-a\u201d is used for identifying the status of a Docker container. This command will also provide a list of available docker containers having the same status on the host. <\/span><\/p>\n<h3 class=\"p1\" style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"13_What_are_Docker_objects\"><\/span><span class=\"s1\">13. What are Docker objects?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"p1\" style=\"text-align: justify;\"><span class=\"s1\">Answer: Though not one of the top docker interview questions, you can find this in any interview. The basic answer for this question refers to Docker images, containers and services. <\/span><\/p>\n<h3 class=\"p1\" style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"14_Do_you_know_about_Namespaces_in_Docker\"><\/span><span class=\"s1\">14. Do you know about Namespaces in Docker?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"p1\" style=\"text-align: justify;\"><span class=\"s1\">Answer: This question is also accounted for as one of the basic docker interview questions. Namespaces in Docker are a technology for the facility of containers in Docker. Every container is associated with a set of namespaces after its creation. Namespaces provide an isolated layer for each container, and every container operates in a particular namespace. <\/span><\/p>\n<h3 class=\"p1\" style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"15_What_is_the_basic_and_crucial_requirement_for_creating_a_Docker_container\"><\/span><span class=\"s1\">15. What is the basic and crucial requirement for creating a Docker container?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"p1\" style=\"text-align: justify;\"><span class=\"s1\">Answer: You can find this among the advanced questions in a docker interview. The answer to this question is the \u2018default image\u2019. An individual could find and access the default image through the Docker Hub. You can find the image by searching for specific domain required. After finding the image, you can follow the documentation to build a Docker container.<\/span><\/p>\n<h3 class=\"p1\" style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"16_Which_factors_determine_the_number_of_containers_you_can_run\"><\/span><span class=\"s1\">16. Which factors determine the number of containers you can run?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"p1\" style=\"text-align: justify;\"><span class=\"s1\">Answer: Even though there is no limit of containers that can run on Docker, hardware limitations come into the picture. Therefore, the two factors which can restrict the number of containers that can be run are related to hardware. They are CPU strength and size of the application.<\/span><\/p>\n<h3 class=\"p1\" style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"17_What_is_the_difference_between_Hypervisor_and_Docker\"><\/span><span class=\"s1\">17. What is the difference between Hypervisor and Docker?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"p1\" style=\"text-align: justify;\"><span class=\"s1\">Answer: This is one of the docker interview questions which tests your knowledge of other development tools. The hypervisor needs extensive hardware for proper function while docker is implemented on an actual operating system. This shows that Docker is highly fast and performs effectively with fluidity.<\/span><\/p>\n<h3 class=\"p1\" style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"18_Explain_the_difference_between_Docker_image_and_layer\"><\/span><span class=\"s1\">18. Explain the difference between Docker image and layer.<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"p1\" style=\"text-align: justify;\"><span class=\"s1\">Answer: Docker image is created with a series of read-only layers. On the other hand, layer in docker represents instructions on the Dockerfile of the image.<\/span><\/p>\n<h3 class=\"p1\" style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"19_How_can_you_monitor_Docker_in_production\"><\/span><span class=\"s1\">19. How can you monitor Docker in production?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"p1\" style=\"text-align: justify;\"><span class=\"s1\">Answer: You can use Docker tools such as Docker events and docker stats for monitoring. Docker stats are accessed with a container ID, and they provide details of CPU and memory usage of a container. Docker events include commands for viewing the stream of activities in a Docker daemon. Some examples of Docker events die, attach, destroy, commit, detach and others. <\/span><\/p>\n<h3 class=\"p1\" style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"20_What_are_the_default_networks_in_Docker\"><\/span><span class=\"s1\">20. What are the default networks in Docker?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"p1\" style=\"text-align: justify;\"><span class=\"s1\">Answer: This is one of the advanced docker interview questions which you cannot ignore. The default networks in Docker include bridge, host and none. The bridge is the default network to which containers connect if there is no specified network. Host network helps in connection to the network stack of host. The none network ensures connection to a container-specific network stack without a network interface.<\/span><\/p>\n<blockquote>\n<p class=\"p1\" style=\"text-align: justify;\"><span class=\"s1\">Preparing to become certified in Docker? Follow this comprehensive guide for <a href=\"https:\/\/www.whizlabs.com\/blog\/docker-certified-associate-exam-preparation-guide\/\" target=\"_blank\" rel=\"noopener noreferrer\"><span class=\"s3\">Docker Certified Associate exam preparation<\/span><\/a> and prepare yourself to pass the exam. <\/span><\/p>\n<\/blockquote>\n<h3 class=\"p1\" style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"21_What_is_Docker_Compose\"><\/span><span class=\"s1\">21. What is Docker Compose?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"p1\" style=\"text-align: justify;\"><span class=\"s1\">Answer: Docker Compose can define as a YAML file that contains details on networks, volumes, and services for creating Docker application. This feature helps to create separate containers and host them alongside ensuring communication between them. <\/span><\/p>\n<h3 class=\"p1\" style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"22_How_can_you_check_the_Docker_Client_and_Docker_server_version\"><\/span><span class=\"s1\">22. How can you check the Docker Client and Docker server version?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"p1\" style=\"text-align: justify;\"><span class=\"s1\">Answer: This is one of the command-based docker interview questions which you can face. The command for information on docker client and server versions is \u201c$ docker version\u201d.<\/span><\/p>\n<h3 class=\"p1\" style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"23_How_can_I_start_stop_and_kill_a_container\"><\/span><span class=\"s1\">23. How can I start, stop and kill a container?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"p1\" style=\"text-align: justify;\"><span class=\"s1\">Answer: This is another command-based question which you can find in a docker interview. <\/span><\/p>\n<ul class=\"ul1\" style=\"text-align: justify;\">\n<li class=\"li1\"><span class=\"s1\">For starting a docker container, use \u201c$ docker start &lt;container_id&gt;\u201d. <\/span><\/li>\n<li class=\"li1\"><span class=\"s1\">For stopping a running container, use \u201c$ docker stop &lt;container_id&gt;\u201d. <\/span><\/li>\n<li class=\"li1\"><span class=\"s1\">For killing a container, use \u201c$ docker kill &lt;container_id&gt;\u201d.<\/span><\/li>\n<\/ul>\n<h3 class=\"p1\" style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"24_How_to_build_a_Dockerfile\"><\/span><span class=\"s1\">24. How to build a Dockerfile?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"p1\" style=\"text-align: justify;\"><span class=\"s1\">Answer: You can build a Dockerfile with necessary specifications by following this command.<\/span><\/p>\n<p class=\"p1\" style=\"text-align: justify;\"><span class=\"s1\">\u201c$ docker build &lt;path to docker file&gt;.\u201d<\/span><\/p>\n<h3 class=\"p1\" style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"25_What_are_the_notable_application_areas_for_Docker\"><\/span><span class=\"s1\">25. What are the notable application areas for Docker?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"p1\" style=\"text-align: justify;\"><span class=\"s1\">Answer: The different areas in which Docker is applied can be presented as follows:<\/span><\/p>\n<ul class=\"ul1\" style=\"text-align: justify;\">\n<li class=\"li1\"><span class=\"s1\">Simplifying configuration.<\/span><\/li>\n<li class=\"li1\"><span class=\"s1\">Code pipelines management.<\/span><\/li>\n<li class=\"li1\"><span class=\"s1\">Debugging capabilities.<\/span><\/li>\n<li class=\"li1\"><span class=\"s1\">Rapid deployment.<\/span><\/li>\n<li class=\"li1\"><span class=\"s1\">Application isolation.<\/span><\/li>\n<li class=\"li1\"><span class=\"s1\">Developer productivity.<\/span><\/li>\n<li class=\"li1\"><span class=\"s1\">Multi-tenancy.<\/span><\/li>\n<\/ul>\n<p><a href=\"https:\/\/www.whizlabs.com\/docker-certified-associate\/practice-tests\/\" target=\"_blank\" rel=\"noopener noreferrer\"><img decoding=\"async\" class=\"aligncenter wp-image-72446 size-full\" src=\"https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2019\/08\/docker-leaderboard.jpg\" alt=\"Docker Practice Tests\" width=\"728\" height=\"90\" srcset=\"https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2019\/08\/docker-leaderboard.jpg 728w, https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2019\/08\/docker-leaderboard-300x37.jpg 300w, https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2019\/08\/docker-leaderboard-640x79.jpg 640w, https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2019\/08\/docker-leaderboard-681x84.jpg 681w\" sizes=\"(max-width: 728px) 100vw, 728px\" \/><\/a><\/p>\n<h4 class=\"p1\" style=\"text-align: justify;\"><span class=\"s1\">Conclusion<\/span><\/h4>\n<p class=\"p1\" style=\"text-align: justify;\"><span class=\"s1\">On a concluding note, we have reflected on some of the top docker interview questions. This discussion, however, did not cover all the questions that interviewers can ask you. It is essential to prepare thoroughly with Docker concepts and tools. Make a habit of implementing your inferences on Docker in practice. This can help you understand the different applications of Docker and explain them from a practical point of view. <\/span><\/p>\n<p class=\"p1\" style=\"text-align: justify;\"><span class=\"s1\">A certification in your resume also acts as an add-on that helps you ace the interview. So, it is recommended to validate your skills and knowledge with a Docker certification. We offer online course and practice tests for the <a href=\"https:\/\/www.whizlabs.com\/docker-certified-associate\/\" target=\"_blank\" rel=\"noopener noreferrer\"><span class=\"s3\">Docker Certified Associate<\/span><\/a><span class=\"s3\"> exam <\/span>for those who are aspired to become certified in Docker. If you are the one, join us now and prepare yourself to have a docker certification.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Preparing for a Docker Interview? Here we bring the top 25 Docker Interview Questions that will help you to ace the interview. Businesses want promising growth with the successful completion of projects. This notion is improved now with the demand for faster and smoother processes. Therefore, there is a huge demand for new and highly functional tools that can support business functions. One such tool is Docker, which is used for packing, shipping, and running applications on containers. Towards the end of 2017, Docker had seen over 8 billion container image downloads. This spurred a huge demand for professionals who [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":72458,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1862],"tags":[2132,2133,2135,2134,2131],"class_list":["post-72444","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-devops","tag-best-docker-interview-questions","tag-docker-interview-preparation","tag-frequently-asked-docker-interview-questions","tag-most-common-docker-interview-questions","tag-top-docker-interview-questions"],"uagb_featured_image_src":{"full":["https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2019\/08\/docker-interview-questions.png",600,315,false],"thumbnail":["https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2019\/08\/docker-interview-questions-150x150.png",150,150,true],"medium":["https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2019\/08\/docker-interview-questions-300x158.png",300,158,true],"medium_large":["https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2019\/08\/docker-interview-questions.png",600,315,false],"large":["https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2019\/08\/docker-interview-questions.png",600,315,false],"1536x1536":["https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2019\/08\/docker-interview-questions.png",600,315,false],"2048x2048":["https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2019\/08\/docker-interview-questions.png",600,315,false],"profile_24":["https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2019\/08\/docker-interview-questions.png",24,13,false],"profile_48":["https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2019\/08\/docker-interview-questions.png",48,25,false],"profile_96":["https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2019\/08\/docker-interview-questions.png",96,50,false],"profile_150":["https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2019\/08\/docker-interview-questions.png",150,79,false],"profile_300":["https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2019\/08\/docker-interview-questions.png",300,158,false],"tptn_thumbnail":["https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2019\/08\/docker-interview-questions-250x250.png",250,250,true],"web-stories-poster-portrait":["https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2019\/08\/docker-interview-questions.png",600,315,false],"web-stories-publisher-logo":["https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2019\/08\/docker-interview-questions.png",96,50,false],"web-stories-thumbnail":["https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2019\/08\/docker-interview-questions.png",150,79,false]},"uagb_author_info":{"display_name":"Dharmalingam N","author_link":"https:\/\/www.whizlabs.com\/blog\/author\/dharmalingam\/"},"uagb_comment_info":2,"uagb_excerpt":"Preparing for a Docker Interview? Here we bring the top 25 Docker Interview Questions that will help you to ace the interview. Businesses want promising growth with the successful completion of projects. This notion is improved now with the demand for faster and smoother processes. Therefore, there is a huge demand for new and highly&hellip;","_links":{"self":[{"href":"https:\/\/www.whizlabs.com\/blog\/wp-json\/wp\/v2\/posts\/72444","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.whizlabs.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.whizlabs.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.whizlabs.com\/blog\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/www.whizlabs.com\/blog\/wp-json\/wp\/v2\/comments?post=72444"}],"version-history":[{"count":5,"href":"https:\/\/www.whizlabs.com\/blog\/wp-json\/wp\/v2\/posts\/72444\/revisions"}],"predecessor-version":[{"id":76777,"href":"https:\/\/www.whizlabs.com\/blog\/wp-json\/wp\/v2\/posts\/72444\/revisions\/76777"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.whizlabs.com\/blog\/wp-json\/wp\/v2\/media\/72458"}],"wp:attachment":[{"href":"https:\/\/www.whizlabs.com\/blog\/wp-json\/wp\/v2\/media?parent=72444"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.whizlabs.com\/blog\/wp-json\/wp\/v2\/categories?post=72444"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.whizlabs.com\/blog\/wp-json\/wp\/v2\/tags?post=72444"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}