[FIXED] Using Jekyll docker inside Jenkins

Issue

I'm trying to build a jekyll website via my Jenkins server (which runs inside a container) and I have a stage in my Jenkinsfile that looks like this:

stage('Building Website') {

      agent {

        docker {
            image 'jekyll/jekyll:builder'
        }

      }

      steps {
        sh 'jekyll --version'
      }
}

The very first time I run my job it pulls the jekyll docker image and runs fine (although it does fetch a bunch of gems before running jekyll which doesn't happen when I run the docker manually outside jenkins) but then the next jobs fail giving this error:

jekyll --version
/usr/jekyll/bin/jekyll: exec: line 15: /usr/local/bundle/bin/jekyll: not found

Any ideas what I'm doing wrong here?

Solution

As you can see in the jenkins log file, jenkins runs docker with the -u 1000:1000 argument, since this user does not exits in the jekyll/jekyll image, the command fails with the error .../bin/jekyll: not found

Here is a sample Jenkinsfile:

pipeline {
    agent
    {
        docker
        {
            image 'jekyll/jekyll:3.8'
            args '''
                -u root:root
                -v "${WORKSPACE}:/srv/jekyll"
            '''
        }
    }
    stages {
        stage('Test') {
            steps {
                sh '''
                    cd /srv/jekyll
                    jekyll --version
                '''
            }
        }
    }
}

Answered By - pim
Answer Checked By - Gilberto Lyons (JavaFixing Admin)