DevOps Classroomnotes 19/Jul/2023

Jenkins contd

Managing different versions of the tools using jenkins

• Lets manage jenkins and navigate to tools => Maven installations
  
  
• Now lets configure the spring petclinic to use top level maven targets
  
• Now build the project manually
  
  

Distributed Builds

• Setup:
  • Fork Spring petclinic Refer Here
    • requirements to build
      • java jdk 17
      • maven 3.9
  • Fork game of life Refer Here
    • requirements to build
      • java 8
      • maven
  • Fork nopcommerce Refer Here
    • requirements to build
      • dotnet 7
• To handle different builds with different software needs, we tend to use different servers.
• Jenkins has distributed builds where we can distribute the builds on differnt nodes by matching labels
  
• While creating a project we can set labels and expect them to be executed on the node matching labels

How to add multiple nodes to jenkins

• Lets create 2 ubuntu vms and lets make one vm the jenkins master
• one one machine install and configure jenkins
• On the node (we will be using existing credentials)
• install jdk 17
• install maven 3.9
• Now lets configure node to the jenkins master with label JDK-17
• On Jenkins UI Navigate to Manage Jenkins => Nodes and Clouds
  
  
  
  
  
  

Lets setup spring petclinic to execute node-1

• Configure spc-day build same as last session with one restriction in General section
  
• Now build and verify the console output
  

Exercises

• Create a jenkins master with t2.micro (ubuntu)
• Create a node with any other os redhat/centos/amazon linux
  • install jdk 17
• Create a job which should run on the other node configure and display its ip address and environmental variables printenv

Note

• To install jenkins we can use the following script

#!/bin/bash
curl -fsSL https://pkg.jenkins.io/debian-stable/jenkins.io-2023.key | sudo tee \
  /usr/share/keyrings/jenkins-keyring.asc > /dev/null
echo deb [signed-by=/usr/share/keyrings/jenkins-keyring.asc] \
  https://pkg.jenkins.io/debian-stable binary/ | sudo tee \
  /etc/apt/sources.list.d/jenkins.list > /dev/null
sudo apt-get update
sudo apt-get install openjdk-17-jdk jenkins -y