Docker Interview Questions and Answers
Question - 61 : - How to configure the default logging driver under Docker?
Answer - 61 : -
To configure the Docker daemon to default to a specific logging driver. You need to set the value of log-driver to the name of the logging drive the daemon.jason.fie.
Question - 62 : - Explain Docker Trusted Registry?
Answer - 62 : -
Docker Trusted Registry is the enterprise-grade image storage toll for Docker. You should install it after your firewall so that you can securely manage the Docker images you use in your applications.
Question - 63 : - What are Docker Namespaces?
Answer - 63 : -
The Namespace in Docker is a technique which offers isolated workspaces called the Container. Namespaces also offer a layer of isolation for the Docker containers.
Question - 64 : - What are the three components of Docker Architecture
Answer - 64 : -
- Client
- Docker-Host
- Registry
Question - 65 : - How do I run multiple copies of Compose file on the same host?
Answer - 65 : -
Compose uses the project name which allows you to create unique identifiers for all of a project’s containers and other resources. To run multiple copies of a project, set a custom project name using the -a command-line option or using COMPOSE_PROJECT_NAME environment variable.
Question - 66 : - What is the purpose of Docker_Host?
Answer - 66 : -
It contains container, images, and Docker daemon. It offers a complete environment to execute and run your application.
Question - 67 : - What is client?
Answer - 67 : -
Docker provides Command Line Interface tools to the client to interact with Docker daemon.
Question - 68 : - Can we use JSON instead of YAML while developing docker-compose file in Docker?
Answer - 68 : -
Yes! It can be used. In order to run docker-compose with JSON, docker-compose -f docker-compose.json up can be used.
Question - 69 : - How many containers you can run in docker and what are the factors influencing this limit?
Answer - 69 : -
There is no clearly defined limit to the number of containers that can be run within docker. But it all depends on the limitations - more specifically hardware restrictions. The size of the app and the CPU resources available are 2 important factors influencing this limit. In case your application is not very big and you have abundant CPU resources, then we can run a huge number of containers.
Question - 70 : - How to use docker for multiple application environments?
Answer - 70 : -
- Docker-compose feature of docker will come to help here. In the docker-compose file, we can define multiple services, networks, and containers along with the volume mapping in a clean manner, and then we can just call the command “docker-compose up”.
- When there are multiple environments involved - it can be either dev, staging, uat, or production servers, we would want to define the server-specific dependencies and processes for running the application. In this case, we can go ahead with creating environment-specific docker-compose files of the name “docker-compose.{environment}.yml” and then based on the environment, we can set up and run the application.