DevOps Classroom notes 21/Oct/2023

Building and Packaging Java Projects using a Maven

• Compilation: Process of
  • checks for errors in code
  • converts to desired language (Byte code/machine code)
• Packaging:
  • Combining compiled code into some packaging format
    • java: jar/war/ear
    • dotnet: dll/exe
• Dependencies: will be downloaded
  • java: maven/gradle
  • dotnet: nuget
  • python: pip
  • nodejs: npm
• Maven: combines dependency resolution, compilation, unit test executions, packaging
• Maven expects a file called as pom.xml
• Steps:
  • Get the latest code
  • Pre-requisites:
    • jdk version
    • maven
  • Execute mvn <goal>
    • compile
    • test
    • package
  • In our case we will be using mvn package

Setup a linux vm for building and packaging spring-petclinic

• pre-req’s
  • git
  • maven
  • jdk 17
• SSH into the vm & execute the following

sudo apt update
sudo apt install openjdk-17-jdk -y
sudo apt install maven -y
git --version
java -version
mvn --version

* Build steps

cd ~
git clone https://github.com/spring-projects/spring-petclinic.git
cd spring-petclinic
mvn package

Azure DevOps Pipelines

• Azure DevOps has two ways of building pipelines
  • Classic Pipelines: We rely on user interface
    • Drawback:
      • History will be missing
    • Advantages:
      • Easy to start
  • Azure Pipelines YAML: Pipeline as Code. We will define pipelines steps in a file azure-pipelines.yaml and add it to the version control system (git)
    • Advantage:
      • History will be maintained
    • Disadvantage:
      • Learning curve for writing pipeline
• Azure DevOps has agents: Agent is where the build is executed. There are two types of agents
  • Microsoft Hosted agents: These are machines which will be created on demand by Azure DevOps and will be delete upon build completion.
  • Self Hosted Agents: These are machines managed by us, we add these machines as agents to Azure DevOps.
• Azure DevOps plans
  • Free:
    • 1 Free Microsoft-hosted CI/CD (1800 minutes/month)
    • 1 Free Self-Hosted CI/CD
    • Azure Source Repos => free
    • Azure Artifacts 2 GB

Configuring Spring petclinic build on Azure DevOps

• Ensure you have some Azure DevOps Project
  
• Import the repository
  
  
  
• Lets setup build
  
  
  
  
  
• To solve this error we need to raise parallelism request Refer Here