Not a simulator. kube-apiserver, kube-controller-manager, kube-scheduler and kubectl are the upstream Go code, compiled to WebAssembly into one binary. The only replaced part is etcd: a small in-memory implementation of the etcd v3 API.
Everything runs in your browser tab. Reload the page and the cluster is gone.
A control plane without nodes is boring. Type join and start the printed docker run command.
The container runs a kubelet and containerd and connects to your browser with WebRTC. Then kubectl get pods -A shows flannel, kube-proxy and CoreDNS on a real node.
KubeDoom starts on the node, and every pod in the default namespace is a monster. Shoot one, and KubeDoom deletes the pod.
The Deployment brings it back, of course. Your browser tab is a node, too.
