Docker basics review in Microservices - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to specify the base image in a Dockerfile.

Microservices

FROM [1]

Drag options to blanks, or click blank then click option'

ACOPY . /app

BRUN apt-get update

Cubuntu:latest

DEXPOSE 80

Attempts:

3 left

💡 Hint

Common Mistakes

Using RUN or COPY instead of a base image after FROM.

The FROM instruction sets the base image for the Dockerfile. Here, ubuntu:latest is a valid base image.

2fill in blank

medium

Complete the Dockerfile command to copy files from the host to the container.

Microservices

COPY [1] /app

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A/app

B.

CRUN apt-get install

DEXPOSE 8080

Attempts:

3 left

💡 Hint

Common Mistakes

Using container paths as source instead of host paths.

The COPY command copies files from the current directory . on the host to the /app directory in the container.

3fill in blank

hard

Fix the error in the Dockerfile command to expose a port.

Microservices

EXPOSE [1]

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A80

Beighty

Cport 80

D8080/tcp

Attempts:

3 left

💡 Hint

Common Mistakes

Writing port names or including protocol in EXPOSE command.

The EXPOSE command expects a port number as an integer, like 80. Text or extra words cause errors.

4fill in blank

hard

Fill both blanks to run a command and set the working directory in a Dockerfile.

Microservices

WORKDIR [1]
RUN [2]

Drag options to blanks, or click blank then click option'

A/app

Bnpm install

Capt-get update

D/usr/src/app

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong directory paths or commands that don't install dependencies.

WORKDIR /usr/src/app sets the working directory. RUN npm install runs the install command inside the container.

5fill in blank

hard

Fill all three blanks to define environment variables, expose a port, and specify the command to run.

Microservices

ENV [1]=[2]
EXPOSE [3]
CMD ["node", "server.js"]

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ANODE_ENV

Bproduction

C3000

Ddevelopment

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong environment variable names or invalid port numbers.

ENV NODE_ENV=production sets an environment variable. EXPOSE 3000 opens port 3000. CMD runs the node server.