Notes for CKA/D preparation

commands

alias k=kubectl
source <(kubectl completion zsh)
#complete -F __start_kubectl k 

export WINNAME=`cmd.exe /c "echo %USERNAME%"| tr -d '\r' `
mkdir ~/.kube ; cp /mnt/c/Users/${WINNAME}/.kube/config ~/.kube

CKA certificate

  • Client certificates
  • Kubernetes api certificate
  • Service account key pair ( to sign the token )

Create resources

  • pod 
    k run mypod  --image=nginx -o yaml --dry-run=client --limits="cpu=100m" --serviceaccount=mysa --requests="memory=100Mi"  \
--labels="mylabel=myvalue" --port=80  --expose  myservice -- /bin/sh -c  'echo mytest'
  • other resources ``` k create deployment mydep –image=nginx –dry-run=client -o yaml

## set context

k config get-contexts kubectl config set-context --namespace= k config current-context

k config set-context –current –namespace ckad-prep
k config view | grep names

kubectl delete pod nginx –grace-period=0 –force kubectl get pods –all-namespaces -o=jsonpath=’{range .items[]}{“\n”}{.metadata.name}{“:\t”}{range .spec.containers[]}{.image}{“, “}{end}{end}’ |sort


## Patch example

kubectl patch deployments my-deployment
-p ‘{“spec”: {“template”: {“spec”: {“nodeSelector”: {“kubernetes.io/hostname”: “mynewhost”}}}}}’
```

  • https://github.com/cncf/curriculum
  • https://training.linuxfoundation.org/wp-content/uploads/2020/03/Important-Tips-CKA-CKAD-March-2020.pdf
  • https://github.com/bmuschko/ckad-crash-course