Recover a Deleted Commit

• Commit 3 is deleted
  
• Check the reflog
  
  

Fork

• This is a Git Server Repository Feature
• Fork is used to create a local copy of the repository where you don’t have permissions.
• Refer Here for the repository owned by someone else
  
  
  

Pull Request

• Once you fork the repository and make changes, then pull request is a way so that we can send our local changes to the actual repository.
• Actual Repository admin, can review you pull request and merge if required, reject if not.
• Now we have create a fork and commited a change in the forked repository
• Now lets create the pull request to send the changes for approval to the original repo owner
  
  
• Now the actual repo owner recieves a pull request
  
  
  

CI/CD Pipeline

• CI/CD Pipeline
  

Jenkins CI/CD Engine

• Jenkins is a CI/CD Engine which can be used to create pipelines.
• Jenkins is developed in JAVA language, so jenkins requires JAVA installation on the servers.
• Jenkins is CRON (Scheduler) on Steriods developed for CI/CD Purposes.

Installing Jenkins

• Lab Setup: Jenkins Master
  
• For installing Jenkins Refer Here
• For now lets create an ubuntu VM (free tier) & for installing refer here Refer Here
• Ensure 22 and 8080 ports are open
• Install java 11 (openjdk11)

# ubuntu
sudo apt-cache search openjdk
sudo apt install openjdk-11-jdk -y

#redhat
sudo yum search openjdk

• Use the commands from the documentation

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 jenkins -y

• Now navigate to http://<public-ip&gt;:8080
  
• Now select install selected plugins
  
  
  
• Now as discussed in the class create a free style jenkins project (job) with 2 commands in build steps => invoke shell

whoami
pwd

* Verify /etc/passwd on jenkins master

* Observations:
* A user with name jenkins and home directory /var/lib/jenkins got created.
* Jenkins UI is as good as linux user jenkins and the permissions which jenkins user has.
* Experiment 2:
* Lets execute sudo apt update in the build step along with whoami and pwd

* Add jenkins to the visudo with no password and rerun the build then it will work.
* Experiment 3:
* Lets build a java code spring pet clinic Refer Here
* Softwares required to perform build
* git
* java 11
* maven
* Commands
git clone https://github.com/spring-projects/spring-petclinic.git
cd spring-petclinic
mvn package

* Execute the build


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