Policy: deployment_best_practices

Deployment is one the Key part of Running an Application.This policiy ensures whether K8's Admins Applied Correct Configuration for RollingUpdateDeployment.

This policy helps to enforce the following deployment best practices:

• Define Rolling Update Strategy
• Ensure revisionHistoryLimit was Set

Define Rolling Update Strategy

Mentioning Rolling Update can be used to adjust the parameters in Manifest File

• maxSurge define how many pod we can add at a time during the rolling update
• maxUnavailable define how many pod can be unavailable during the rolling update

When this rule is failing?

A different Deployment Strategy value is used:

spec:
  replicas: 3
  strategy:
        type: Recreate

OR If maxSurge or maxUnavailable are missing

spec:
 replicas: 3
 strategy:
       type: RollingUpdate

Ensure revisionHistoryLimit was Set

If Deployment of New Version is Messed up to Roll Back to the Previous Version We Use Kubectl commands and to get previous History of Deployment we can add revisionHistoryLimit in Manifest Files to get previous versions upto certain versions

When this rule is failing?

revisionHistoryLimit wasn't set to an Integer

spec:
 revisionHistoryLimit: NA

Policy author

Avinash \ Avinash