Kubernetes

common commands

Command	Purpose
kubeadm init --pod-network-cidr=192.168.0.0/16	Initilializes cluster with specific pod network
kubadm reset --v=5	Resets the cluster installation and clean-ups everything BUT iptables, ipvs
kubectl get nodes -o wide	Displays nodes
kubeadm join $KUBE_MASTER_IP:6443 --token $KUBE_TOKEN --discovery-token-unsafe-skip-ca-verification	Joins new member to cluster and skips CA verificiation check; not recommended
kubectl create deployment $deployment-name --image=$image	Creates a new deployment for a pod
kubectl get deployments	View deployment
kubectl get pods	View pods
kubectl get events	View cluster events
kubectl config view	View the kubectl configuration
kubectl expose deployment $deployment-name -type=LoadBalancer --port=$port	Create services and Expose the Pod to the public network
kubectl get services	Displays services

Command	Purpose
kubectl taint nodes --all	Removes 'taint' for master node to take on additional duties in cluster

monolith: large old/legacy application; does all kinds of things
microservices: small apps, loosely coupled, deployed indepently.
Deployment: description of service to deploy to k8s api
Pod: Compute Execution Layer in kubernetes for keeping coupled containers together that typically share resources.
Container: lowest layer and where the app runs