Web-based Kubernetes scheduler simulator
Hello world. Here is web-based Kubernetes scheduler simulator.
On the simulator, you can create/edit/delete these resources to simulate a cluster.
- Nodes
- Pods
- Persistent Volumes
- Persistent Volume Claims
- Storage Classes
- Priority Classes
You can create resources with yaml file as usual.
And, after pods are scheduled, you can see the results of
- Each Filter plugins
- Each Score plugins
- Final score (normalized and applied Plugin Weight)
You can configure the scheduler on the simulator through KubeSchedulerConfiguration.
Scheduler Configuration | Kubernetes
You can pass a KubeSchedulerConfiguration file via the environment variable KUBE_SCHEDULER_CONFIG_PATH and the simulator will start kube-scheduler with that configuration.
Note: changes to any fields other than .profiles are disabled on simulator, since they do not affect the results of the scheduling.
If you want to use your custom plugins as out-of-tree plugins in the simulator, please follow this doc.
Background
In real Kubernetes, we cannot know the results of scheduling in detail without reading the logs, which usually requires privileged access to the control plane. Therefore, we have developed a simulator for kube-scheduler -- you can try out the behavior of the scheduler with web UI while checking which plugin made what decision for which Node.
It can be used to learn about the Kubernetes scheduler or to examine the detailed behavior of plugins, etc.
Getting started
Run with Docker
We have docker-compose.yml to use the simulator easily.
You can use it with the below command.
make docker_build_and_upThen, you can access the simulator with http://localhost:3000
Note: Insufficient memory allocation in the docker environment settings sometimes causes problems in building the image. Please increase memory limit in that case.
Run Locally
You have to run frontend, server and etcd.
Run simulator server and etcd
To run this simulator's server, you have to install Go and etcd.
You can install etcd with kubernetes/kubernetes/hack/install-etcd.sh.
make startIt starts etcd and simulator-server locally.
Run simulator frontend
To run the frontend, please see README.md on ./web dir.
Contributing
see CONTRIBUTING.md
other docs
Community, discussion, contribution, and support
Learn how to engage with the Kubernetes community on the community page.
You can reach the maintainers of this project at:
Code of conduct
Participation in the Kubernetes community is governed by the Kubernetes Code of Conduct.