kubectl-tips.md

Kubectl tips

Install kubectl

Update the apt package index and install packages needed to use the Kubernetes apt repository:

sudo apt-get update
sudo apt-get install -y apt-transport-https ca-certificates curl

Download the Google Cloud public signing key:

sudo curl -fsSLo /usr/share/keyrings/kubernetes-archive-keyring.gpg https://packages.cloud.google.com/apt/doc/apt-key.gpg

Add the Kubernetes apt repository:

echo "deb [signed-by=/usr/share/keyrings/kubernetes-archive-keyring.gpg] https://apt.kubernetes.io/ kubernetes-xenial main" | sudo tee /etc/apt/sources.list.d/kubernetes.list

Update apt package index with the new repository and install kubectl:

sudo apt-get update
sudo apt-get install -y kubectl

check all version

apt-cache policy kubectl

kubectl cmpletion

apt-get install bash-completion

Enable kubectl autocompletion

echo 'source <(kubectl completion bash)' >>~/.bashrc
kubectl completion bash >/etc/bash_completion.d/kubect

If you have an alias for kubectl, you can extend shell completion to work with that alias:

echo 'alias k=kubectl' >>~/.bashrc
echo 'complete -F __start_kubectl k' >>~/.bashrc

Good alias

alias kg='kubectl get'
alias klo='kubectl logs -f'

fzf is a general-purpose command-line fuzzy finder.

URL

It's an interactive Unix filter for command-line that can be used with any list; files, command history, processes, hostnames, bookmarks, git commits, etc.

Installation:

sudo apt-get install fzf

Krew is the plugin manager for kubectl command-line tool.

URL

Installation

(
  set -x; cd "$(mktemp -d)" &&
  OS="$(uname | tr '[:upper:]' '[:lower:]')" &&
  ARCH="$(uname -m | sed -e 's/x86_64/amd64/' -e 's/\(arm\)\(64\)\?.*/\1\2/' -e 's/aarch64$/arm64/')" &&
  curl -fsSLO "https://github.com/kubernetes-sigs/krew/releases/latest/download/krew.tar.gz" &&
  tar zxvf krew.tar.gz &&
  KREW=./krew-"${OS}_${ARCH}" &&
  "$KREW" install krew
)

kubectx + kubens: Power tools for kubectl

URL

kubectx helps you switch between clusters back and forth

kubens helps you switch between Kubernetes namespaces smoothly

Installation

kubectl krew install ctx
kubectl krew install ns
# OR
sudo apt install kubectx

Good alias

# kubectx
alias kx=kubectx
complete -F _complete_alias kx
alias kctx="kubectl ctx"
alias kubectx="kubectl ctx"

# kubens
alias kn=kubens
complete -F _complete_alias kn
alias kns="kubectl ns"
alias kubens="kubectl ns"

kube-ps1: Kubernetes prompt for bash and zsh

URL

A script that lets you add the current Kubernetes context and namespace configured on kubectl to your Bash/Zsh prompt strings (i.e. the $PS1).

add this line on ~/.zshrc

wget https://raw.githubusercontent.com/jonmosco/kube-ps1/master/kube-ps1.sh -o ~/.oh-my-zsh/plugins/kube-ps1/kube-ps1.plugin.zsh
vim ~/.zshrc
source ~/.oh-my-zsh/plugins/kube-ps1/kube-ps1.plugin.zsh
PROMPT=$PROMPT'$(kube_ps1) '
source ~/.oh-my-zsh/plugins/kubectl/kubectl.plugin.zsh
RPROMPT='%{$fg[blue]%}($ZSH_KUBECTL_PROMPT)%{$reset_color%}'

Deprecations AKA KubePug - Pre UpGrade (Checker)

URL

Installation

kubectl krew install deprecations
# Usage
kubectl deprecations --help

Others good Tips

• kubectl-df-pv: A kubectl plugin to see df for persistent volumes.
• kubectl-images: Show container images used in the cluster