DevOps Classroomnotes 02/May/2022

Jenkins (Contd)

• Installing Jenkins Refer Here
• Software and Hardware requirements for jenkins Refer Here
• Basic Requirements
  
• Initially lets take a free tier eligible machine
  • AWS: t2.micro
    
  • Azure: Standard_B1s
• Login to the ubuntu VM
  
• Now install java 11 on ubuntu Refer Here
  
• Commands used

sudo apt update
sudo apt-cache search openjdk
sudo apt install openjdk-11-jdk -y
java -version

• Now lets try to install jenkins on ubuntu Refer Here
• Commands used

curl -fsSL https://pkg.jenkins.io/debian-stable/jenkins.io.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 fontconfig jenkins -y
sudo systemctl status jenkins.service

• Verify Jenkins Service
  
• Now Navigate to http://<publicip>:8080
  
• Continue the installation
  
  
  
  
  
  
  
  

Now lets see what has happened on the ubuntu vm to make jenkins work

• Lets see the users in the linux system
  • command: sudo cat /etc/passwd. A new user called as jenkins is created and the group name is Jenkins with the home directory of /var/lib/jenkins
    
• In Jenkins we create jobs, Lets create one now
  
  
  
  
  
  
  
• From the jenkins UI, no matter what user you are logged in as, the low level commands are executed as a jenkins user
• Now lets try to do sudo apt update from the jenkins ui
  
  
• Now build the job/project
  
  
• From Jenkins UI we can do anything that the linux user jenkins can do.
• From Jenkins UI if we need to do installations etc, we need sudo permissions without password.
• So Lets configure linux jenkins user to have sudo permissions without password prompts
  
• Now lets explore the home directory of jenkins
  
• We have create a project called as hellojenkins
• Lets explore the jobs folder
  
  
• Now lets create a job which leads to creation of some files
  
  
  
• Exercise: Try to Create Jenkins on the Centos 7 Server
• Note:
  • Creating AWS EC2 instance Refer Here
  • Create an Azure VM Refer Here