Provide namespace scheduling and manual startup
This component was created to help manage a Kubernetes cluster shared by different teams. Assumptions are:
- each team has one or more namespaces where their pods run
- don't want to pay for 24/7 operation
- for most namespaces there's a core CI window of 8h each weekday
- occasionally teams would like to use their environments after hours
This solution is a k8s pod which runs in the background:
- it "stops" namespaces by setting a zero limit and deleting pods
- it "starts" namespaces by removing the zero limit
- namespaces are stopped 8h after the last scheduled or manual start
The UI served by the k8s pod allows the following:
- click ">" to manually start a namespace or extend for another 8 hours
- set optional weekday start time for namespace
- set memory limit for namespace (min 10G, max 100G)
To build and run the docker container, use make run then go to
http://localhost:8080 for the UI.
The container can be configured using environment variables:
| Variable | Default | Description |
|---|---|---|
| IGNORED_NAMESPACES | kube-system,kube-public,kube-node-lease,podreaper,docker | Reaper will ignore these namespaces |
| ZONE_ID | UTC | Time Zone used by UI |
| NAMESPACE_TICK | 11s | How often to update namespace data for UI |
| NAMESPACES_TICK | 17s | How often to check for new namespaces |
| RANGER_TICK | 41s | How often to check limit ranges |
| CLOCK_TICK | 13s | How often to update UI clock |
| REAPER_TICK | 29s | How often to check if pods need to be reaped |
# namespace needs to be created before applying
kubectl create ns podreaper
# deploys pod as well as service account, cluster role
# and cluster role binding which allow it to make changes to the
# other namespaces
kubectl apply -f deploy.yaml -n podreaper
# to access the ui on http://localhost:8080
kubectl port-forward deployment/podreaper 8080:8080 -n podreaperInstall front end modules
cd frontend
npm installNote: In order to use the kubernetes backend you must have a working cluster and kubeconfig defined.
- Create namespace for config
kubectl create ns podreaper - Run the back end using
make backend-dev - Run the front end using
make frontend-dev - Go to http://localhost:3000 in your browser to test. The UI will automatically reload when front end code is changed.
For front end unit tests run make frontend-test.
- Front end is written in Elm
- Icon generated with https://favicon.io/favicon-generator/
- Back end written in Golang and uses:
- client-go go client for k8s