kubectl-blame-examples

kubectl-blame-examples

This repository contains a simplified version of Tilt that's used for teaching and talks.

In Search of a kubectl blame Command at KubeCon 2020

Each subdirectory contains a sample app that you can run with:

cd $DIR
go run ./main.go

Each sample app does the same basic flow:

1. Build and push the image (with docker build, docker push, and some magic to detect the registry)
2. Apply the deployment (with kubectl apply)
3. Track the deployment's progress (with kubernetes/client-go)

The main difference between each project is how they track the deployment.

0-naive

Creates a random image tag and label for each deployment. Watches that label.

Code: main.go

1-kubectl-rollout

Uses the approach of kubectl rollout, waiting for the deployment to report success.

Code:

• main.go
• rollout.go forked from rollout_status.go

2-helm

Uses the approach of helm --wait, looking up the replicaset and waiting for it to report success

Code:

• main.go
• Uses the Helm Kube client off the shelf, which is fun to read! wait.go

3-kubespy

Uses the approach of kubespy trace, using owner references to find everything.

Code:

• main.go
• trace.go forked from traceDeployment in trace.go

4-tilt

Uses the current Tilt approach, with a combination of owner refs and template hashes.

Code:

• main.go
• pod_template_hash.go computes labels, forked from pod_template.go
• owner_fetcher_go.go computes the owner tree, forked from owner_fetcher.go

License

Copyright 2020 Windmill Engineering

Licensed under the Apache License, Version 2.0