These tasks are required a minikube cluster and a real running cluster ( EKS for example)

Minikube

• Sample Minikube config

❯ minikube config view
- kubernetes-version: v1.20.2
- memory: 4g
- network-plugin: cni
- nodes: 2
- cni: calico
- cpus: 4
- driver: hyperkit
- install-addons: [registry-creds ingress]

• Minikube config file: ~/.minikube/config/config.json

{
  "cni": "calico",
  "container-runtime": "containerd",
  "cpus": "8",
  "driver": "virtualbox",
  "install-addons": [
      "registry-creds",
      "ingress",
      "metallb",
      "gvisor",
      "metrics-server"
  ],
  "memory": "8192",
  "network-plugin": "cni",
  "nodes": 3
}

EKS

Terraform

Vagrant

• Noted:
  • Edit the Vagrantfile in order to change the default kubernetest version ( default: 1.21.1 )
  • Once provisioner finished setup cluster, the kube config file will be copied to kubernetes-setup/config location

$cd Vagrant
$vagrant plugin install vagrant-vbguest
$vagrant up
$ ## Accessing master
$ vagrant ssh k8s-master
vagrant@k8s-master:~$ kubectl get nodes
NAME         STATUS   ROLES    AGE     VERSION
k8s-master   Ready    master   18m     v1.21.1
node-1       Ready    <none>   12m     v1.21.1
node-2       Ready    <none>   6m22s   v1.21.1

$ ## Accessing nodes
$ vagrant ssh node-1
$ vagrant ssh node-2

$#From host
$export KUBECONFIG="./kubernetes-setup/config"
$kubectl get nodes -o wide
NAME         STATUS   ROLES                  AGE     VERSION   INTERNAL-IP     EXTERNAL-IP   OS-IMAGE             KERNEL-VERSION      CONTAINER-RUNTIME
k8s-master   Ready    control-plane,master   4h5m    v1.21.1   192.168.50.10   <none>        Ubuntu 16.04.7 LTS   4.4.0-210-generic   docker://20.10.6
node-1       Ready    <none>                 3h55m   v1.21.1   192.168.50.20   <none>        Ubuntu 16.04.7 LTS   4.4.0-210-generic   docker://20.10.6
node-2       Ready    <none>                 3h45m   v1.21.1   192.168.50.30   <none>        Ubuntu 16.04.7 LTS   4.4.0-210-generic   docker://20.10.6

Note: Generate kubeconfig in case of missing file

• Master node:

kubeadm init phase kubeconfig admin --apiserver-advertise-address x.x.x.x --apiserver-bind-port 8443 --cert-dir /var/lib/minikube/certs --kubeconfig-dir {{ /home/change_me }}

• Setup HA cluster

  39

Alias

source <(kubectl completion bash)
complete -F __start_kubectl k
alias k="kubectl"
alias kgd="k get deploy"
alias kgp="k get pods"
alias kgn="k get nodes"
alias kgs="k get svc"
alias kge="k get events --sort-by='.metadata.creationTimestamp' |tail -8"
export ETCDCTL_API=3
export do="--dry-run=client -o yaml"

Edit .vimrc

filetype plugin indent on
" show existing tab with 2 spaces width
set tabstop=2
" when indenting with '>', use 2 spaces width
set shiftwidth=2
" On pressing tab, insert 2 spaces
set expandtab

Material Resources

1. https://prabhatsharma.in/blog/cka-practice-test-1/
2. https://www.udemy.com/course/certified-kubernetes-administrator-with-practice-tests/