Commands

Question 1

Create a container (without starting it)

Answer 1

docker create [IMAGE]

Question 2

Rename an existing container

Answer 2

docker rename [CONTAINER_NAME] [NEW_CONTAINER_NAME]

Question 3

Run a command in a new container

Answer 3

docker run [IMAGE] [COMMAND]

Question 4

Run a command in a new container – and then remove the container after it exits.

Answer 4

docker run –rm [IMAGE]

Question 5

Start a container and keeps it running.

Answer 5

docker run -td [IMAGE]

Question 6

Start a container, allocates a pseudo-TTY connected to the container’s stdin, and creates an interactive bash shell in the container.

Answer 6

docker run -it [IMAGE]

Question 7

Creates, starts, and runs a command inside the container.

Once it executes the command, the container is removed.

Answer 7

docker run -it-rm [IMAGE]

Question 8

Delete a container (if it is not running)

Answer 8

docker rm [CONTAINER]

Question 9

Update the configuration of one or more containers

Answer 9

docker update [CONTAINER]

Question 10

Start a container

Answer 10

docker start [CONTAINER]

Question 11

Stop a running container

Answer 11

docker stop [CONTAINER]

Question 12

Stop a running container and start it up again

Answer 12

docker restart [CONTAINER]

Question 13

Pause processes in a running container

Answer 13

docker pause [CONTAINER]

Question 14

Unpause processes in a running container

Answer 14

docker unpause [CONTAINER]

Question 15

Block a container until others stop (after which it prints their exit codes)

Answer 15

docker wait [CONTAINER]

Question 16

Kill a container by sending a SIGKILL to a running container

Answer 16

docker kill [CONTAINER]

Question 17

Attach local standard input, output, and error streams to a running container

Answer 17

docker attach [CONTAINER]

Question 18

Create an image from a Dockerfile

Answer 18

docker build [URL]

Question 19

– builds an image from a Dockerfile in the current directory and tags the image

Answer 19

docker build -t

Question 20

Pull an image from a registry

Answer 20

docker pull [IMAGE]

Question 21

Push an image to a registry

Answer 21

docker push [IMAGE]

Question 22

Create an image from a tarball

Answer 22

docker import [URL/FILE]

Question 23

Create an image from a container

Answer 23

docker commit [CONTAINER] [NEW_IMAGE_NAME]

Question 24

Remove an image

Answer 24

docker rmi [IMAGE]

Question 25

Load an image from a tar archive or stdin

Answer 25

docker load [TAR_FILE/STDIN_FILE]

Question 26

Save an image to a tar archive, streamed to STDOUT with all parent layers, tags, and versions

Answer 26

docker save [IMAGE] > [TAR_FILE]

Question 27

List running containers

Answer 27

docker ps

Question 28

– lists both running containers and ones that have stopped

Answer 28

docker ps -a

Question 29

List the logs from a running container

Answer 29

docker logs [CONTAINER]

Question 30

List low-level information on Docker objects

Answer 30

docker inspect [OBJECT_NAME/ID]

Question 31

List real-time events from a container

Answer 31

docker events [CONTAINER]

Question 32

Show port (or specific) mapping for a container

Answer 32

docker port [CONTAINER]

Question 33

Show running processes in a container

Answer 33

docker top [CONTAINER]

Question 34

Show live resource usage statistics of containers

Answer 34

docker stats [CONTAINER]

Question 35

Show changes to files (or directories) on a filesystem

Answer 35

docker diff [CONTAINER]

Question 36

List all images that are locally stored with the docker engine

Answer 36

docker image ls

Question 37

Show the history of an image

Answer 37

docker history [IMAGE]

Question 38

List networks

Answer 38

docker network ls

Question 39

Remove one or more networks

Answer 39

docker network rm [NETWORK]

Question 40

Show information on one or more networks

Answer 40

docker network inspect [NETWORK]

Question 41

Connects a container to a network

Answer 41

docker network connect [NETWORK] [CONTAINER]

Question 42

Disconnect a container from a network

Answer 42

docker network disconnect [NETWORK] [CONTAINER]

Question 43

The basic format for using docker is:

Answer 43

docker command [options]

Question 44

To list all containers, both running and stopped:

Answer 44

docker ps –a

Question 45

To list containers by their ID

Answer 45

docker ps –aq

Question 46

To list the total file size of each container

Answer 46

docker ps –s

Question 47

To list the latest created containers

Answer 47

docker ps –l

Question 48

The main command to launch or start a single or multiple stopped Docker containers

Answer 48

docker start [options] container_id

Question 49

To create a new container from an image and start it

Answer 49

docker run [options] image [command] [argument]

Question 50

If you do not define a name for your newly created container, the deamon will generate a random string name. To define container name, use the ______ option

Answer 50

--name docker run ––name=Ubuntu_Test ubuntu:14.04

Question 51

What command will create the Ubuntu_test container based on the ubuntu:14.04 image and start it?

Answer 51

docker run ––name=Ubuntu_Test ubuntu:14.04

Question 52

A container may be running, but you may not be able to interact with it. To start the container in interactive mode, use the _____ and _____ options.

Answer 52

docker run –it ––name=Ubuntu_Test ubuntu:14.04

Question 53

Instead of using -i or -t options, use the _______ command to connect to a running container

Answer 53

attach docker attach container_id

Question 54

Command to stop a container

Answer 54

docker stop [option] container_id Replace container_id with the container’s name or ID

Question 55

By default, you get a ____ second grace period. The stop command instructs the container to stop services after that period. Use the ____ option to define a different grace period expressed in seconds

Answer 55

10 --time Example: docker stop --time=20 container_id

Question 56

To immediately kill a docker container without waiting for the grace period to end use

Answer 56

docker kill [option] container_id

Question 57

To stop all running containers, enter the following

Answer 57

docker stop $(docker ps –a –q) The same command could be used with kill. This would stop all containers without giving them a chance to exit.