a) Kubelete
- Main Kubernetes agent
- Registers node with cluster (decide who is the master node)
- Watches api server
- Instantiates the pods ( not creating the pod)
- Reports back to master
- Expose endpoint on 10255
b) kube-proxy
- Manages the kubernetes networking
- Assigning pod IP address (indirectly)
- All containers in a pod share a single IP
- Load balances across all pods in service
- Can use different network plugins/drivers like calico (CNI plugins)
c) Container Engine
- Container Management
- Pulling images
- start/stop the containers
- Pluggable
- can use any container runtime like docker, containerd etc.
- default docker