RUN instruction for executing commands in Docker - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the Dockerfile line to run a command during image build.

Docker

RUN [1]

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ACMD python app.py

Bapt-get update

CEXPOSE 80

DCOPY . /app

Attempts:

3 left

💡 Hint

Common Mistakes

Using COPY or CMD with RUN, which are different instructions.

Trying to expose ports with RUN instead of EXPOSE.

The RUN instruction executes commands during the image build. Here, apt-get update updates package lists.

2fill in blank

medium

Complete the RUN command to install curl using apt-get.

Docker

RUN apt-get update && apt-get [1] -y curl

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Ainstall

Bremove

Cupgrade

Dclean

Attempts:

3 left

💡 Hint

Common Mistakes

Using remove instead of install.

Using upgrade which updates existing packages but doesn't install new ones.

The install command installs packages. Here, it installs curl after updating package lists.

3fill in blank

hard

Fix the error in the RUN instruction to update and install git.

Docker

RUN apt-get update && apt-get [1] git

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A-y install

Binstall

Cinstall -y

D-y remove

Attempts:

3 left

💡 Hint

Common Mistakes

Placing -y after the package name.

Using remove instead of install.

The -y option must come before the package name. Correct syntax is apt-get install -y git.

4fill in blank

hard

Fill both blanks to run a shell command that creates a directory and lists its contents.

Docker

RUN mkdir [1] && ls [2]

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A/app

B/var

D/tmp

Attempts:

3 left

💡 Hint

Common Mistakes

Creating one directory but listing another.

Using invalid directory paths.

The command creates the /app directory and then lists its contents with ls /app.

5fill in blank

hard

Fill all three blanks to run a command that updates, installs vim, and cleans up.

Docker

RUN apt-get [1] && apt-get install [2] vim && apt-get [3]

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Aupdate

B-y

Cclean

Dremove

Attempts:

3 left

💡 Hint

Common Mistakes

Using remove instead of clean at the end.

Omitting the -y flag during install.

The command updates package lists, installs vim with automatic yes, and cleans up temporary files.