Docker Commands

Question 1

What is tag in docker image ?

Answer 1

While pulling the docker image , version of image is tag
like **redis:4.0 ** is a tag

Question 2

WhaT is the default tag ?

Answer 2

latest version is default tag

Question 3

Where we know the tags of images ?

Answer 3

In docker hub we see the image tags

Question 4

What is a command to run a docker

Answer 4

docker run dockerImage

Question 5

How to view running containers

Answer 5

docker ps

Question 6

How to view stoped containers

Answer 6

docker ps -a

Question 7

How to stop docker

Answer 7

docker stop dockerName/dockerID

Question 8

How to view downloaded images

Answer 8

docker images

Question 9

How to delete stored images ?

Answer 9

docker rmi imageID/RepoName

Question 10

How to download only docker image

Answer 10

docker pull imageName

Question 11

How to run a docker in detached mode

Answer 11

docker -d dockerImage

Question 12

How to attach a detached docker ?

Answer 12

docker attach dockerName/ID

Question 13

How to check docker version ?

Answer 13

docker version

Question 14

How to view docker network connections

Answer 14

docker network ls

Question 15

What are tags in docker ?

Answer 15

Image versions are docker tags

Question 16

How to download docker image by tag

Answer 16

Image name followed by : colon
docker pull redis:7.2.3-alpine3.18
or
docker pull redis:latest

Question 17

How to mount a host directory in docker container

Answer 17

docker run -v /opt/dataDir:/var/lib/mysql mysql

Question 18

How to run a docker with name

Answer 18

docker run –name thor centos

Question 19

How to check logs of running container ?

Answer 19

docker logs container-name

Question 20

Run docker from busybox image , auto remove after stop , autologin & detached , also name a container .

Answer 20

docker run –name thor –rm -itd busybox

Question 21

How to get os relese info of docker ?

Answer 21

docker run ubuntu cat /etc/rel

Question 22

How to run docker container for 2 minutes

Answer 22

docker run ubuntu sleep 120

Question 23

How to pull the latest tag of ubuntu version

Answer 23

docker run ubuntu:latest

Question 24

How Map a host port to docker container port

Answer 24

docker run -p 4000:8080 kodekloud/webapp

Question 25

How to get Full details of running container

Answer 25

docker inspect container_ID

Question 26

How to list running containers

Answer 26

docker ps
ps stands for Process Status

Question 27

How to list stopped & running containers

Answer 27

docker ps -a

Question 28

How to kill running container

Answer 28

docker stop containerName

Question 29

How to remove an , stopped or running container

Answer 29

docker rm imagename or id

Question 30

How to remove downloaded docker image

Answer 30

1. First check container is not running, stop it if running
2. remove the stopped container
3. Now you are able to remove the docker container image

Question 31

How to download only docker image

Answer 31

docker pull image_name

Question 32

How to run docker container for 6o seconds

Answer 32

docker run ubuntu sleep 60

Question 33

How to run command in running container

Answer 33

**docker exec dockerID cat /etc/*rel***

Question 34

How to run docker image in detached mode

Answer 34

docker run -d ubuntu

Question 35

How to attach docker container

Answer 35

docker attach dockerID

Question 36

How to run a docker image as , login to docker container & attache it to host terminal

Answer 36

docker -it ubuntu bash

Question 37

What is Docker run command ?

Answer 37

Docker Run Command is used to run a container from an image

Question 38

What is an docker Repository

Answer 38

Docker Account which holds the docker images

Question 39

How to see the exit code of stopped container

Answer 39

docker ps -a
Now see the Status , a number in brackets is the exit code

Question 40

How to run a container in Background

Answer 40

docker -d ubuntu sleep 100

Question 41

Where is docker container runs

Answer 41

Docker Container runs under Docker Host or Docker Engine