Docker Interview Questions and Answers

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Top Docker Interview Questions and Answers - 2021 [UPDATED]

Are you looking for Docker Interview Questions and Answers? Than you are at the Right Place. Browse through Popular and Most Asked Interview Questions for Docker.  There is a Huge Demand for Docker Professionals in the Market. These Questions are suitable for both Freshers and Experienced Professionals and are based on Trending Topics and as per Current Industry Requirements.

Master These Topics and Increase your Chances in cracking Docker Interviews like a pro and Secure your Dream Job Today.

Docker Interview Questions and Answers

  • 40 Questions

Docker is light weight and more efficient in terms of resources because it uses the host underlying kernal rather than creating it’s own hypervisor.

There are three main features Volumes Environment Variable Injection Read Only file systems

It starts with docker file and need to build it to create image of the container then redistribute it using registry and run the containers.

Docker Swarm is native gathering for docker. It is used to group of Docker hosts into a single and virtual docker host. It provides the standard docker application program interface.

Docker compose starts in a such a order based on the link volumes form and network mode.

I can build my own image and use it for creating a Docker Container( V) I can pull an image from docker Hub and then run docker images(v) I can directly create a docker container without docker image(x)

Four States: Running, Paused, Restarting and Exited.

bridge: The default network driver host: For stand alone containers , remove network isolation between the container and the docker host Overlay: Overlay networks connect multiple docker daemons macvlan: for assigning MAC address for container none: disable all neworking

/var/lib/docker/volumes

These are the mechanism for applying metadata to docker objects including, images, containers, Local daemons, volumes, network, swam nodes,swarm services.

We need to use restart policy …example …docker run always.

FROM pyhton:2.7-slim WORKDIR /app COPY . /app docker build –tag

docker push username/repository:tag

By changing the replicas value in docker compose.yml and re run the command docker stack deploy.

by using this command docker-machine create –driver virtual box myvm1.

yum install docker

It will give the more information about container in json format.

Run jenkins on docker Run integration tests jenkins using docker-compose

Engine CLI, Compose CLI, Machine CLI, DTR(Docker Trusted Registry)CLI ,UCP (Universal Control Pane) CLI.

docker container stop name docker container rm name docker image rm name

dockerd [options]

docker stats or docker top

We have to use tag option docker run –log-driver=fluentd –log-opt fluentd-address=myhost.local:24224 –log-opt tag=”mailer”

4 aspects Kernal namespaces control groups docker daemon attack surface Linux kernal capabilities

Using Docker Hub and Docker Registry

docker run image /bin/bash -c “cd /path/; python a.py”

If we want to manage container scheduling over multiple hosts we will go for docker swarm.

1. Return on investment and cost saving Standardization and productivity CI/CD and efficiency Simple and Secure

1.build an image file to docker file 2.use multistage builds 3.manage application data using and bind mounts 4.scale app as a swarm

we can find using docker version command 19.03

systemctl start/stop docker service docker start/stop