DevOps Classroom notes 25/Nov/2023

Configuring Maven in Jenkins

• To install maven in jenkins there are two approaches
  • Using Jenkins: Avoid this approach
  • installing maven and configuring in jenkins: This is better approach
• To install softwares we need sudo permissions. Lets give sudo permissions to the jenkins user as we are installing maven on jenkins master node
• Execute sudo visudo or visudo from root user
  
• Lets install Maven 3.9.5

cd /tmp
wget https://dlcdn.apache.org/maven/maven-3/3.9.5/binaries/apache-maven-3.9.5-bin.tar.gz
tar -xvzf apache-maven-3.9.5-bin.tar.gz
sudo mkdir /opt/maven
sudo mv apache-maven-3.9.5 /opt/maven

• Lets configure Maven: Navigate to Manage Jenkins => Tools
  • Lets Add JDK
    
  • Now lets add Maven 3.9.5
    
  • Now lets add Maven 3.8.8
• Tools section in jenkins help in finding tool locations like jdk,maven etc..
• The advantage is we can configure multiple versions

Lets create a job to run a maven project

• Lets configure spring petclinic
• Lets configure openmrs
• Note: For screenshots refer video.
  

Lets try to show the test results for maven

• We know that the test results will be stored in target/surefire-reports/TEST-*.xml
• Jenkins has support for patterns **/TEST-*.xml which means in any filder if there any file matching TEST-*.xml find it
• Lets configure this
  
  
• Now lets build the project and see the test results
  
  

Lets archive the artifact

• This activity allows users to download the artifacts directly from jenkins
  
  
  

When to trigger project builds

• To do this effectively we need to understand
  • Day build: Building the code using CI/CD during the effective working hours of team (CI)
    • Get executed whenver developer pushes code
  • Nightly build: Building the code using CI/CD post working hours with effective testing (CD)
    • Gets executed once in a day

Lets configure day build and night build for spring petclinic

• Build Triggers
  • Poll SCM: This will poll scm (git) for any new change. we need to configure how frequently should jenkins poll
  • Build Periodically: This will trigger build based on schedule defined
• To configure this jenkins uses crontab syntax Refer Here
• We have forked from spring petclinic into Refer Here
• Day build: Poll SCM
  
• Nightly build: Build every weekday at 8:35 PM
  
• Note: From now onwards day builds execute on a branch called as sprint-dev and nightly builds on a branch called as sprint-release
• Create an account in mailtrap Refer Here