Docker agents for isolation in Jenkins - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to specify the Docker agent in a Jenkins pipeline.

Jenkins

pipeline {
  agent {
    docker {
      image '[1]'
    }
  }
  stages {
    stage('Build') {
      steps {
        echo 'Building inside Docker container'
      }
    }
  }
}

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

Aubuntu:latest

Bnodejs:14

Calpine:3.12

Dpython:3.8

Attempts:

3 left

💡 Hint

Common Mistakes

Using an invalid or misspelled image name.

Omitting the image tag (like :latest).

The image field specifies the Docker image to use for the agent. Here, ubuntu:latest is a common base image.

2fill in blank

medium

Complete the code to run a shell command inside the Docker agent.

Jenkins

pipeline {
  agent {
    docker {
      image 'python:3.8'
    }
  }
  stages {
    stage('Test') {
      steps {
        sh '[1]'
      }
    }
  }
}

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

Apython --version

Bpip install requests

Cecho Hello World

Dls -l

Attempts:

3 left

💡 Hint

Common Mistakes

Using commands that require prior installation.

Using commands unrelated to the container's environment.

The sh step runs a shell command inside the Docker container. Here, python --version checks the Python version inside the container.

3fill in blank

hard

Fix the error in the Docker agent declaration to correctly specify the Docker image.

Jenkins

pipeline {
  agent {
    docker {
      image [1]
    }
  }
  stages {
    stage('Deploy') {
      steps {
        echo 'Deploying application'
      }
    }
  }
}

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

A"nginx:latest"

Bnginx:latest

C'nginx:latest'

Dnginx_latest

Attempts:

3 left

💡 Hint

Common Mistakes

Not using quotes around the image name.

Using invalid image names.

The image value must be a string enclosed in quotes. Using single quotes like 'nginx:latest' is correct.

4fill in blank

hard

Fill both blanks to define a Docker agent with a custom label and reuse the same image in a stage.

Jenkins

pipeline {
  agent {
    docker {
      image [1]
      label [2]
    }
  }
  stages {
    stage('Build') {
      agent {
        docker {
          image 'myapp:latest'
        }
      }
      steps {
        echo 'Building inside Docker'
      }
    }
  }
}

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

A'myapp:latest'

B'docker-agent'

C'ubuntu:20.04'

D'build-node'

Attempts:

3 left

💡 Hint

Common Mistakes

Using unquoted strings for image or label.

Mismatching image names between agent and stage.

The image is set to 'myapp:latest' to specify the Docker image. The label is set to 'docker-agent' to identify the agent node.

5fill in blank

hard

Fill all three blanks to create a Docker agent with arguments, reuse the image, and run a command inside the container.

Jenkins

pipeline {
  agent {
    docker {
      image [1]
      args [2]
    }
  }
  stages {
    stage('Test') {
      steps {
        sh '[3]'
      }
    }
  }
}

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

A'node:16'

B'-u root:root'

Cnpm test

D'--privileged'

Attempts:

3 left

💡 Hint

Common Mistakes

Not quoting the image or args values.

Using incorrect shell commands.

The image is 'node:16'. The args specify running as root user with '-u root:root'. The shell command npm test runs tests inside the container.