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Tips for CKAD Test

Alias

  • alias k=kubectl
  • kubectl run nginx --image nginx
alias k=alias
alias kdr="kubectl --dry-run -o=yaml "
alias kget="kubectl -o=yaml get "
alias desc="kubectl describe "

VI Setup

cat ~/.vimrc
:set number
:set et
:set sw=2 ts=2 sts=2

Shift + A - go to the end of the current row (insert mode)

Shift + C - delete everything after the cursor (insert mode)

Shift + I - go to the first letter on the current row (insert mode)

Shift + G - go to the last row of data in the file

/Pod - find any instances of Pod in the file

e - jump to the end of the next word

w - jump to the start of the next word

:25 - go to the 25th row in the file

Unix

while true; do date >> /var/log/app.txt;sleep 5;done

Kubernetes

Generators

For pre-1.18

k run nginx --image=nginx  (deploy)
k run nginx --image=nginx --restart=Never (pod)
k run nginx --image=nginx --restart=OnFailure (job)
k run nginx --image=nginx --restart=OnFailure -schedule="* * * * * " (cronjob)

post-1.18

k create deployment nginx --image=nginx  (deploy)
k run nginx --image=nginx --restart=Never (pod)
k create job nginx --image=nginx  (job)
k create cronjob nginx --image=nginx --schedule="* * * * *" --dry-run -o yaml (cronjob)

General

Switch context:

k config set-context $(k config current-context) --namespace=dev

Explain

k explain job.spec 
k explain cronjob.spec --recursive

Looking for a specific value:

k describe pods | grep --context=10 annotations:
k describe pods | grep -i -c=10 annotations:
k describe pods | grep --context=10 Events: