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## CKA

## CKA Playground

## CKS

## CKS Goals

  • Be comfortable with changing the kube-apiserver in a kubeadm setup
  • Be able to work with AdmissionControllers
  • Know how to create and use the ImagePolicyWebhook
  • Know how to use opensource tools Falco, Sysdig, Tracee, Trivy

## CKS Scenario Playground

Know your VIM

how to tab multiple line in vim

  • To indent multiple lines using vim you should set the shiftwidth using :set shiftwidth=2. Then mark multiple lines using Shift v and the up/down keys.

  • To then indent the marked lines press > or < and to repeat the action press .

## comment multiple lines with vim

  • goto start of line
  • press Ctrl + v
  • move arrow to end of file
  • press Shift + i to INSERT
  • press # for comment
  • esc or
: s/^/# [press enter]

## uncomment multiple lines with vim

  • goto start of line
  • press Ctrl + v
  • move arrow to end of file
  • press d for uncomment
  • esc

vim undo

Press u, :u, or :undo to undo the last change (entry)

## Indent multiple lines

To indent multiple lines press Esc and type :set shiftwidth=2. First mark multiple lines using Shift v and the up/down keys. Then to indent the marked lines press > or <. You can then press . to repeat the action.

## vim copy and paste

  • Mark lines: Esc+V (then arrow keys)
  • Copy marked lines: y
  • Cut marked lines: d
  • Past lines: p or P

open file with gedit

gedit dep.yaml

## APIs in different k8s version 1.23

kubectl-convert 
kubectl diff

Best Shortcuts for speed

Shell Profile

vim ~/.bashrc

export do="--dry-run=client -o yaml"
export now="--force --grace-period=0"
alias k=kubectl
alias c=clear
alias kg="kubectl get"
alias kd="kubectl describe"
alias ke="kubectl edit"
alias ka="kubectl apply -f"
alias kn='kubectl config set-context --current --namespace'

VIM

vim ~/.vimrc
set expandtab
set shiftwidth=2
set tabstop=2
set autoindent
set smartindent
set bg=dark
set nowrap
set paste

Troubleshooting API Server

Log locations to check:

/var/log/pods
/var/log/containers

# kubelet logs: 
/var/log/syslog or journalctl or /var/log/messages

crictl ps + crictl logs
docker ps + docker logs (in case when Docker is used)

# wait till container restarts
watch crictl ps