notes/kubernetes cluster.md

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.