session-69.txt

-> check whether application is already installed or not?
	-> if installed run helm upgrade
	-> if not installed, run helm install
	
helm list -A --short | grep backend

if it is giving non empty response, then it means already installed. run helm upgrade
if it is giving empty response, then it means not installled. first time installation. Run helm install

releaseExists = sh(script: "helm list -A --short | grep -w ${component} || true", returnStdout: true).trim()

if(releaseExists.notEmpty()){

}
else{
else{

}


what if current deployment fails?
--------------------------------
do the deployment --> helm install or helm upgrade

if helm install
-----------------
if current deployment fails, you cant rollback because there is no previous version. inform users the same

if helm upgrade
-----------------
if the current deployment fails, you can rollback to previous version --> can I end the pipeline?

what if rollback also fails?
----------------------------
so check the rollback deployment status also...

if success
------------
pipeline is success, inform all the teams that deployment failed, rollback happened and it is success  --> P0 issue

pipeline is failure, inform all the teams that deployment failed, rollback also failed. application is down completely. --> P0 issue


Multi branch pipeline
-----------------------
feature branching --> main/master feature

feature --> short lived
main --> long lived

deployment in DEV environment --> feature
non-dev like QA, UAT, PRE-PROD, PROD --> master

1. development/application pipeline
	build
	scans
	unit testing
	functional testing --> test cases based on component
2. non-prod pipeline
	run manifest, but config is differenet
		DB URL, other system URL, username and password
	integration tests --> test cases based on entire project
	stages{
		stage('Deploy'){
		
		}
		stage('Integration tests'){
		
		}
	}
		
3. prod pipeline
	check CR is approved or not...
	run manifest, but config is differenet
	
	stages{
		stage('Check CR'){
			check CR is in approval state and deployment window is correct not.
		}
		stage('Deploy'){
		
		}
	}
	
	sanity testing --> overall application is production and imp features are accessible or not


unit tests vs functional tests vs integration testing
-----------------------------------------------------
steel rod
button
umbrella cloth

Manual
Shell scripting

Infra create deploy into K8

dev
qa
prod