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Install Prerequisites on ALL (Worker and Master) Nodes

Let's remove any old versions of Docker if they exist:

sudo yum remove docker \
                  docker-common \
                  docker-selinux \
                  docker-engine

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Some Jenkinsfile examples

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node {
    stage 'Checkout and Build' 
    
    createVirtualEnv 'env'
    executeIn 'env', 'pip install -r requirements.txt'
    executeIn 'env', './manage.py test'
    executeIn 'env', './manage.py integration-test'
    
    virtualEnv('true')
    runCmd('pip install -r requirements.txt')

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Docker Commands, Help & Tips

Show commands & management commands

$ docker

Docker version info

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Master: Dependencies

apt update && apt upgrade -y
curl https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -

cat <<EOF > /etc/apt/sources.list.d/kubernetes.list
deb http://apt.kubernetes.io/ kubernetes-xenial main
EOF

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DevOps started out as "Agile Systems Administration". In 2008, Andrew Shafer did a talk called "Agile Infrastucture" addressing issues around involving more of the company in the same disciplines as programmers.

In 2009, Patrick Debois created "DevOpsDays" conference to help to bring it to light. However, it wouldn't begin to trend until about 2010, when people would begin to describe it as a standalone discipline.

Today, DevOps goes beyond just developers, systems administration and infrastructure, its about [dev, ops, agile, cloud, open source and business](https://blogs.the451group.com/opensource/2010/03/03/devops-mixing-dev-ops-agile-cloud-open-source-and-busi

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#!/bin/bash

# options:
# remove stopped containers and untagged images
#   $ dkcleanup 
# remove all stopped|running containers and untagged images
#   $ dkcleanup --reset
# remove containers|images|tags matching {repository|image|repository\image|tag|image:tag}
# pattern and untagged images
#   $ dkcleanup --purge {image}

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// Related to https://issues.jenkins-ci.org/browse/JENKINS-26481

abcs = ['a', 'b', 'c']

node('master') {
    stage('Test 1: loop of echo statements') {
        echo_all(abcs)
    }
    
    stage('Test 2: loop of sh commands') {

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def getProjectName() {
    return 'JenkinsPipeline'
}

def getJDKVersion() {
    return 'jdk1.8.0_101'
}

def getMavenConfig() {
    return 'maven-config'

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// A Declarative Pipeline is defined within a 'pipeline' block.
pipeline {

  // agent defines where the pipeline will run.
  agent {
    // This also could have been 'agent any' - that has the same meaning.
    label ""
    // Other possible built-in agent types are 'agent none', for not running the
    // top-level on any agent (which results in you needing to specify agents on
    // each stage and do explicit checkouts of scm in those stages), 'docker',