[Kubernetes 배우기] Section 2. Kubernetes Overview

Kubernetes for the Absolute Beginners - Hands-on | Udemy

 

Node: machine where Kubernetes is installed

Cluster: Group of nodes

Master node: Another node that controls cluster(worker nodes)

• kube-APIserver is installed

Worker node: where the actual computation is going on

• kubelet is installed

 

Components of Kubernetes:

• API server: where the user interacts to control the Kubernetes server
• etcd: distributed key-value storage
• kubelet: agent in each node that checks if the worker node is running as expected
• Container Runtime: software to run container (ex. Docker)
• Controller: checks for container status(whether it is down), and brings out new containers if needed
• Scheduler: distributing load across nodes and containers

 

Container runtime and kubelet are in the worker node while other components are in the master node.

 

kubectl: used to deploy and manage applications on the Kubernetes cluster

kubectl run: deploy an application on the cluster

kubectl cluster-info: get information about the cluster

kubectl get nodes: get nodes in the cluster