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add notes for k8s cluster

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Jason Lu 2024-12-18 14:05:28 +08:00
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kubernetes cluster
### Control Plane Components
- control plane : manage the overall state of the cluster
kube-api server: The core component server that exposes kubernetes HTTP API
etcd: Consistent and highly-avaliable key value store for all API server data
kube-scheduler: looks for pods not yet bound to a node, and assigns each pod to a suitable node.
- kube-controller-manager: Runs controllers to implement kubernetes API behavior.
cloud-controller-manager: integrates with underlying cloud providers. (optional)
### Node Components
- kubelet: Ensures that pods are running, including their containers.
- kube-proxy: Mantains network rules on nodes to implement services. (optional)
- container runtime: Software responsible for running containers.
### Add Ons
- DNS: For cluster wide DNS resolution
- web UI(dashboard): For cluster management via web interface.
- Container resource monitoring: For collecting and storing container metrics.
- cluster-level logging: For saving container logs to a central log store.