Research Questions Authenticating to Registry

What is the user/account and image/repository name for the image company/nginx?

image=company, user=nginx
image=company, user=company
image=nginx, user=nginx
image=nginx, user=company

Choose the right command to pull ubuntu image from a private registry at gcr.io

docker pull ubuntu
docker pull kk/ubuntu
docker pull gcr.io/kk/ubuntu
All of the above

Which command is used to authenticate with azr.com registry which listens on port 5000?

docker auth azr.com:5000
docker login azr.com:5000

You are required to store a copy of the official alpine image in your company’s internal docker registry. What would be your approach?

Create a Dockerfile similar to the official image and build an image
Pull the official image, tag it with the address of the internal docker registry and push to the internal docker registry

When you log in to a registry, the command stores credentials in … (Please explore the documentation pages for this)

$HOME/.docker/config.json
/etc/docker/.docker/config.json
/var/lib/docker/.docker/config.json
/var/lib/docker/containers/.docker/config.json

While trying to delete image postgres, you got an error “conflict: unable to remove repository reference “postgres” (must force) – container 1a56b95e073c is using its referenced image adf2b126dda8″. What may be the cause of this error?

A container is using this image
Must use force option to delete an image
Another image is using layers from this image
The image was built locally on this host

Which command is used to remove webapp:v1 image locally?

docker image rm webapp
docker image rm webapp:v1
docker image remove webapp:v1
docker image del webapp:v1

Remove all unused images on the Docker host

docker image prune -a
docker image rm -a
docker image delete -a
None of the above

Display all layers of httpd image along with the size on each layer.

docker image layers httpd
docker image history httpd
docker image inspect httpd
docker images history httpd

Which command can be used to get the ExposedPorts of a webapp image?

docker container ls
docker image inspect webapp
docker container inspect webapp
docker image ls

How to get the Os field alone of the httpd image?

docker image inspect httpd -f '{{.Os}}'
docker image ls | grep Os
docker image history | grep Os
docker image inspect httpd -f '{{.OperatingSystem}}'

Which subcommand will be used to get more info about images?

inspect
load
import
ls

Print the value of ‘Architecture’ and ‘Os’ for a 'webapp' image.

docker image inspect webapp -f '{{.Os}}' -f '{{.Architecture}}'
docker image inspect webapp -f '{{.Os}} {{.Architecture}}'
docker image inspect webapp -f '{{.Os}}', -f '{{.Architecture}}'
docker image inspect webapp -f '{{.Os .Architecture}}'

Which command can be used to get a backup of image webapp?

docker image backup webapp -o webapp.tar
docker image save webapp -o webapp.tar
docker container save webapp -o webapp.tar
docker container backup webapp -o webapp.tar

A tarfile – nginx.tar – has been created using the docker image save command. Which command can be used to extract it into your docker host.

docker image import -i nginx.tar
docker image restore -i nginx.tar
docker container restore -i nginx.tar
docker image load -i nginx.tar

A government facility runs a secure data center with no internet connectivity. A new application requires access to docker images hosted on docker hub. What is the best approach to solve this?

Get the Dockerfile of the image and build a local version from within the restricted environment.
Establish a secure link between the host in the restricted environment and docker hub
Pull docker images from a host with access to docker hub, convert to a tarball using docker image save command, and copy to the restricted environment and extract the tarball
Pull docker images from a host with access to docker hub, then push to a registry hosted within the restricted environment.

You have created a nginx container and customized it to create your own webpage. How can you create an image out of it to share with others?

docker image save
docker image export
docker export
You can only create an image using a Dockerfile

How do you restore an image created from the docker export command?

docker container import
docker image import
docker image load
docker image restore

The “export” command works with Docker images.

True
False

Export webapp container’s filesystem as a tar archive. Select the right answer

docker export webapp mywebapp.tar
docker image export --output="mywebapp.tar" webapp
docker image save -i mywebapp.tar
docker container export webapp > mywebapp.tar

Research Questions Authenticating to Registry

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