Day06 | Kubernetes Multinode Cluster Setup | Kind

It is very important to practice on multi-node Kubernetes cluster for CKA exam. and practicing on cloud service like as EKS, AKS or GKS is not give more details as its managed by cloud. Also this involves cost, there are some free credits but I didnt found those sufficient.

There are various other tolls which help to setup cluster locally on workstation. Tools are minikube , Kind etc. I found Kind is best tool to practice. So below steps refer to Kind.

Kind uses container as node.

Kind need go installed on machine. 

• My Machine details:  

Linux rvkmr 6.8.0-50-generic #51-Ubuntu SMP PREEMPT_DYNAMIC Sat Nov  9 17:58:29 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux

• Install go:

sudo apt install golang 

• Install kind:

Referred doc : https://kind.sigs.k8s.io/docs/user/quick-start/

[ $(uname -m) = x86_64 ] && curl -Lo ./kind https://kind.sigs.k8s.io/dl/v0.26.0/kind-linux-amd64

chmod +x kind 

sudo mv ./kind /usr/local/bin/kind

• Single Node Cluster Setup With Kind:

kind create cluster --image=kindest/node:v1.31.4@sha256:2cb39f7295fe7eafee0842b1052a599a4fb0f8bcf3f83d96c7f4864c357c6c30 --name kind-cka-cluster

• Check Cluster info:

kubectl cluster-info --context kind-cka-cluster

•  Multi-Node Cluster Setup With Kind:

create config.yaml file as below

kind: Cluster
apiVersion: kind.x-k8s.io/v1alpha4
nodes:
- role: control-plane
- role: worker
- role: worker

run command to setup multi-node cluster

kind create cluster --image=kindest/node:v1.31.4@sha256:2cb39f7295fe7eafee0842b1052a599a4fb0f8bcf3f83d96c7f4864c357c6c30 --name cka-cluster2 --config ./config.yaml

• Check nodes in cluster:

ravikumar@rvkmr:~/k8s/k8schallange/day6$ kubectl get nodes
NAME                         STATUS     ROLES           AGE     VERSION
cka-cluster2-control-plane   NotReady   control-plane   2m30s   v1.31.4
cka-cluster2-worker          NotReady   <none>          72s     v1.31.4
cka-cluster2-worker2         NotReady   <none>          72s     v1.31.4
ravikumar@rvkmr:~/k8s/k8schallange/day6$ kubectl get nodes
NAME                         STATUS     ROLES           AGE     VERSION
cka-cluster2-control-plane   Ready      control-plane   2m49s   v1.31.4
cka-cluster2-worker          NotReady   <none>          91s     v1.31.4
cka-cluster2-worker2         NotReady   <none>          91s     v1.31.4
ravikumar@rvkmr:~/k8s/k8schallange/day6$ kubectl get nodes
NAME                         STATUS   ROLES           AGE     VERSION
cka-cluster2-control-plane   Ready    control-plane   4m37s   v1.31.4
cka-cluster2-worker          Ready    <none>          3m19s   v1.31.4
cka-cluster2-worker2         Ready    <none>          3m19s   v1.31.4

• List cluster:

ravikumar@rvkmr:~/k8s/k8schallange/day6$ kind get clusters
cka-cluster2
kind-cka-cluster

• Set Context to connect different cluster

ravikumar@rvkmr:~/k8s/k8schallange/day6$ kubectl config use-context kind-cka-cluster2
Switched to context "kind-cka-cluster2".

• Delete cluster

ravikumar@rvkmr:~/k8s/k8schallange/day6$ kind delete cluster --name kind-cka-cluster
Deleting cluster "kind-cka-cluster" ...
Deleted nodes: ["kind-cka-cluster-control-plane"]