Image tags and versioning in Docker - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the command to pull the latest version of the nginx image.

Docker

docker pull nginx:[1]

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Alatest

Bstable

Cold

Dnewest

Attempts:

3 left

💡 Hint

Common Mistakes

Using tags like 'old' or 'newest' which do not exist.

Forgetting to specify a tag and expecting a specific version.

The latest tag is used to pull the most recent version of an image by default.

2fill in blank

medium

Complete the command to tag a local image with version 1.2 before pushing.

Docker

docker tag myapp:dev myrepo/myapp:[1]

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A1.2

Blatest

Cstable

Ddev

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'dev' as a version tag when pushing to a repository.

Using 'latest' when a specific version is required.

Version tags like 1.2 specify the image version explicitly.

3fill in blank

hard

Fix the error in the command to push version 2.0 of the image to the repository.

Docker

docker push myrepo/myapp:[1]

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Av2.0

B2.0

Cversion2

D2

Attempts:

3 left

💡 Hint

Common Mistakes

Using incomplete or mismatched tags causing push failures.

Adding prefixes not matching the tag format.

Tags should match the exact version format used when tagging the image, usually numeric like 2.0.

4fill in blank

hard

Fill both blanks to build an image named 'webapp' with version 3.5 from the current directory.

Docker

docker build -t [1]:[2] .

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Awebapp

B3.5

Clatest

Dapp

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'latest' as version when a specific version is requested.

Using wrong image names.

The -t option tags the image with name and version. Here, 'webapp' is the name and '3.5' is the version.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps image names to their version tags if the version is greater than 1.0.

Docker

versions = {name: [1] for name, [2] in images.items() if [3] > 1.0}

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Atag

Dversion

Attempts:

3 left

💡 Hint

Common Mistakes

Using inconsistent variable names causing errors.

Using the wrong variable in the condition.

The dictionary comprehension extracts the version tag for each image. The variable tag is used to compare if it's greater than 1.0.