DevOps Classroomnotes 15/Oct/2022

Git aliases

• Refer Here for documentation
  
• Some of aliases used by me

alias.pushsub=push origin HEAD:master
alias.rspush=push --recurse-submodules=check
alias.history=log --graph --decorate --pretty=oneline --abbrev-commit
alias.pushmain=push origin HEAD:main

Git Submodule

• When we want to create Git repository that contains another git repository, this is problematic => submodule helps Refer Here
• Refer Here for the submodule demo added in the class
• When we add a submodule (a git repo with in git repo) a file called .gitmodules will be updated Refer Here

Git Ops

• In this approach, we have everything expressed as code
  • Merging the code from feature branches => pull request or branch merges
  • Infrastructure expressed as code (IaC)
  • Deployment Manifests (Kubernetes)
  • Configuration expressed as COde (CM)
• GitOps can be acheived using multiple ways
  • Webhooks/hooks => we can call scripts which will perform the activities
  • GitLab CI/CD
  • GitHub Actions
• We will learn the Git Ops (we will stick to only building the code)
• Refer Here for jenkins declarative vs Github actions
• Core Concepts of GitHub actions Refer Here
• Events trigger workflow Refer Here. Our area of intrest are pull request and push
• Runners:
  • Github Runners: Refer Here for pricing
  • Self Hosted Runners: Refer Here
• Refer Here for github actions market place
• Use Cache action to preserve the downloaded dependencies Refer Here
• Refer the following
  • Java with maven Refer Here