Basic Commands

Install Kubectl

sudo snap install kubectl --classic

Install KIND

curl -Lo ./kind https://kind.sigs.k8s.io/dl/v0.11.1/kind-linux-amd64
sudo mv kind /usr/bin/kind
sudo chmod +x /usr/bin/kind

Create a Local Cluster

kind create cluster --name k8s1
...
kubectl cluster-info --context kind-k8s1

Change Context

kubectl config use-context kind-k8s2

Delete Cluster

kind delete cluster --name=k8s1

Create a Cluster on the Local Network

Create a cluster file called kind.yml and expose on the local network

kind: Cluster
apiVersion: kind.x-k8s.io/v1alpha4
name: workers
networking:
  ipFamily: ipv4
  apiServerAddress: 192.168.1.70
  apiServerPort: 45001

Create the cluster

sudo kind create cluster --config=kind.yaml

Get Token

Run the script get-token.sh

kubectl get -n kube-system secret $(kubectl get -n kube-system sa/admin-user -o jsonpath="{.secrets[0].name}") -o go-template="{{.data.token | base64decode}}"

RBAC and Users

Admin User

Create a file called admin-user-serviceaccount.yaml

apiVersion: v1
kind: ServiceAccount
metadata:
  name: admin-user
  namespace: kube-system

RBAC Admin User

Cereate a file called admin-user-rbac.yaml

apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: admin-user
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-admin
subjects:
- kind: ServiceAccount
  name: admin-user
  namespace: kube-system

Apply

Then a script called setup-admin-user.sh to set things up

kubectl apply -f admin-user-serviceaccount.yaml
kubectl apply -f admin-user-rbac.yaml
echo '- - - - - - - - - - - - - - - - - - - - - - - - - -'
kubectl get -n kube-system secret $(kubectl get -n kube-system sa/admin-user -o jsonpath="{.secrets[0].name}") -o go-template="{{.data.token | base64decode}}" | tee token.txt
echo
echo '- - - - - - - - - - - - - - - - - - - - - - - - - -'
kubectl create clusterrolebinding cluster-admin-binding --clusterrole cluster-admin --user admin-user

Kubernetes Dashboard

To get the Kubernetes dashboard and proxy to it, run this script dashboard-and-proxy.sh

kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/v2.3.1/aio/deploy/recommended.yaml
kubectl proxy