CKA Sample questions with answers

Pre Setup

Once you’ve gained access to your terminal it might be wise to spend ~1 minute to setup your environment. You could set these:

alias k=kubectl                         # will already be pre-configured
export do="--dry-run=client -o yaml"    # k create deploy nginx --image=nginx $do
export now="--force --grace-period 0"   # k delete pod x $now

Vim

The following settings will already be configured in your real exam environment in ~/.vimrc. But it can never hurt to be able to type these down:

set tabstop=2
set expandtab
set shiftwidth=2

Question 1 | Contexts

You have access to multiple clusters from your main terminal through kubectl contexts. Write all those context names into /opt/course/1/contexts.

Next write a command to display the current context into /opt/course/1/context_default_kubectl.sh, the command should use kubectl.

Finally write a second command doing the same thing into /opt/course/1/context_default_no_kubectl.sh, but without the use of kubectl.

Answer:
Maybe the fastest way is just to run:

k config get-contexts # copy manually
k config get-contexts -o name > /opt/course/1/contexts

Or using jsonpath:

k config view -o yaml # overview
k config view -o jsonpath="{.contexts[*].name}"
k config view -o jsonpath="{.contexts[*].name}" | tr " " "\n" # new lines
k config view -o jsonpath="{.contexts[*].name}" | tr " " "\n" > /opt/course/1/contexts

The content should then look like:

# /opt/course/1/contexts
k8s-c1-H
k8s-c2-AC
k8s-c3-CCC

Next create the first command:

# /opt/course/1/context_default_kubectl.sh
kubectl config current-context

And the second one:

# /opt/course/1/context_default_no_kubectl.sh
cat ~/.kube/config | grep current