My journey to Certified Kubernetes Administrator (CKA)

The Journey Is More Important Than the Destination.

• CKA is the most touching exam I have passed.

• The Journey Is More Important Than the Destination.

• Fastest practice skills are crutial.

• Have fun.

My tips

Use kubectl Cheat Sheet

Kubectl autocomplete – BASH

source <(kubectl completion bash) # setup autocomplete in bash into the current shell, bash-completion package should be installed first.
echo "source <(kubectl completion bash)" >> ~/.bashrc # add permanently

You can also use a shorthand alias for kubectl that also works with completion:

alias k=kubectl
complete -F __start_kubectl k

Kubectl apply 

kubectl apply -f ./my-manifest.yaml            # create resource(s)

Interacting with running Pods

# Run pod nginx and write its spec into a file called pod.yaml
kubectl run nginx --image=nginx --dry-run=client -o yaml > pod.yaml

#Better usage with $do
export do="–dry-run=client -o yaml"
kubectl run nginx --image=nginx $do > pod.yaml

Explorer note (2026): practise these tips with the vDan Kubernetes tools

Explorer note: the commands in these tips now live in the kubectl CLI Interactive Mindmap, which shows every kubectl command and subcommand of the current reference with usage, examples and options. The manifests you generate with $do are covered topic by topic in the Kubernetes YAML Explorer: one annotated manifest per CKA and CKAD topic, a field reference built from the Kubernetes API, and 50 timed exam-style tasks with hints and solutions. The table maps the tips of this post to both tools.

Tip from this post	In the kubectl mindmap	In the Kubernetes YAML Explorer
kubectl completion bash, alias k=kubectl	kubectl completion with the bash, zsh, fish and powershell subcommands	Namespaces and contexts: set the context namespace once instead of typing -n
kubectl apply -f	kubectl apply and its subcommands edit-last-applied, set-last-applied, view-last-applied	Deployment, rolling update and rollback; task zero-downtime rolling update
kubectl run ... $do > pod.yaml	kubectl run and kubectl create: every generator with its flags	Pod with one container; task write a Pod manifest
CKA cluster tasks (not in these tips)	drain, cordon, taint, certificate	CKA track: node maintenance, taints, tolerations and affinity, static Pods, etcd snapshot and restore
Fastest practice skills are crucial	Search any flag, for example kubectl get with -o jsonpath and --sort-by	Study tasks: 50 timed tasks, switch the Track chip to CKA

Great Vim

vi ~/.vimrc
set ts=2 sw=2 expandtab ruler

Use tmux

• Okna v terminálu pomocí Tmux
• How to Use tmux on Linux

A Ctrl+B Cheat Sheet

Session Commands

• S: List sessions.

Window Commands

• C: Create a new window.
• N: Move to the next window.
• P: Move to the previous window.

Pane Commands

• %: Create a horizontal split.
• “: Create a vertical split.
• X: Close the current pane.