canonical/istio-operators

istio-pilot should look for signs of another istio install during deployment

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#104 opened on Aug 4, 2022

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enhancementgood first issue

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Description

Since istio is a global application, we often hit trouble if a charm is deployed somewhere that has:

  • another istio already running
  • a previous istio install that has been incompletely removed (possibly leaving the admission and mutating webhooks, for example)

At charm deployment (or maybe start?), we should look for these signs and block/alert the user. Maybe we'd need an action that can override this state just in case it is a false positive, but in general giving the user this info would be helpful. maybe it would be enough to debug-log things, but that feels pretty silent, especially since these leftovers usually break the istio deployment anyway so the user will be blocked one way or another.

Contributor guide

Research direction
Explore methods to detect existing Istio installations in a Kubernetes cluster, such as checking for MutatingWebhookConfiguration, ValidatingWebhookConfiguration, deployments with label 'istio', and custom resource definitions. Consider using the Kubernetes API to list these resources. Then design a check that runs during charm deployment and blocks or alerts if detected.
Tech stack
pythonkubernetes
Domain
backenddevopsinfrastructure
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
PythonKubernetes
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60