docker

Question 1

To turn and image into a container and enter its shell, type

Answer 1

docker run -it –name container-name image-name

Question 2

To list all live running containers, type

Answer 2

docker ps

Question 3

To exit a docker container’s shell without shutting it down, type

Answer 3

control P Q

Question 4

A docker container is basically

Answer 4

a daemon thats running an image. Treat it like its own computer.

Question 5

To enter the shell of a particular container, type

Answer 5

docker attach container-name

Question 6

To shut down a container from inside it’s terminal, type

Answer 6

exit

Question 7

To see all your downloaded docker images, type

Answer 7

docker images

Question 8

To delete an image, type

Answer 8

docker rmi -f image-name

Question 9

To delete a container, type

Answer 9

docker rm -f container-name

Question 10

Am image is

Answer 10

all the code of the OS, the environment dependencies, and your app code

Question 11

To create a new image, you need to

Answer 11

create a Dockerfile

Question 12

The FROM section in the Dockerfile defines

Answer 12

which base image you will copy from dockerhub.

Question 13

The EXPOSE section in the Dockerfile defines

Answer 13

the port that your container will be allowed listen to.

Otherwise it will ignore

Question 14

To build a docker image based on your application code, and the Dockerfile, type

Answer 14

docker build -t my-image-name .

this is if my files are local in . and my .Dockerfile is in .

Question 15

To pass requests from port 8000 on my computer to port 8000 in my computer, type

Answer 15

docker run -p 8000:8000 image-name

Question 16

To make a docker container accept requests on a particular port, you need to

Answer 16

put EXPOSE 8000 in the dockerfile so it will be permitted to listen
run the container with docker run -p 8000:8000 image-name so requests to my computer are forwarded to the container

Question 17

For development, to get updates to project files to get seen by the docker image, you need to use

Answer 17

a volume

Question 18

a volume is

Answer 18

a path to a directory that your container will be able to access in real time from your main computer in its container. A portal.

Question 19

A dockerfile is basically

Answer 19

the list of instructions for creating a new docker image

Question 20

Before deploying, you must

Answer 20

remove your volume and create a new image with the files actually copied into the image.

Question 21

Volumes do not

Answer 21

save into the image.

Question 22

The COPY section in the dockerfile defines

Answer 22

files to copy from the local computer to the container computer.

e.g. COPY myDir /myContainerDir

Question 23

The CMD section in the dockerfile defines

Answer 23

a command you want to run in the container’s WORKDIR
Must be a list of arguments
e.g. CMD [‘echo’, ‘string’]

Question 24

Docker closes the container if

Answer 24

Process ID 1 exits

Question 25

The process for using this with django might be

Answer 25

Create a dockerfile from a python3 image
create a volume for my app files
create a command for pip install -r requirements.txt
Then create the container from the image, and add the port to the run command.
then run runserver
https://www.youtube.com/watch?v=hnxI-K10auY

Question 26

the WORKDIR section in the dockerfile defines the

Answer 26

path to a folder automatically created by docker, and where your commands will run from

Question 27

the ADD section in the dockerfile defines

Answer 27

a file that you want copied into

Question 28

ADD and COPY are the same except

Answer 28

ADD can also accept a URL