kubernetes : add kubectl krew

kubernetes/kubectl/krew.md

@@ -0,0 +1,35 @@
+## Krew
+
+Krew is a plugin management tool for kubectl
+
+### Install
+
+```bash
+(
+  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$/arm64/')" &&
+  KREW="krew-${OS}_${ARCH}" &&
+  curl -fsSLO "https://github.com/kubernetes-sigs/krew/releases/latest/download/${KREW}.tar.gz" &&
+  tar zxvf "${KREW}.tar.gz" &&
+  ./"${KREW}" install krew
+)
+```
+- Add .krew/bin to $PATH
+
+### Autocompletion
+
+```bash
+mkdir -p ~/.oh-my-zsh/custom/completions
+chmod -R 755 ~/.oh-my-zsh/custom/completions
+cd ~/.oh-my-zsh/custom/completions
+wget https://github.com/ahmetb/kubectx/blob/master/completion/_kubens.zsh
+wget https://github.com/ahmetb/kubectx/blob/master/completion/_kubectx.zsh
+echo "fpath=($ZSH/custom/completions $fpath)" >> ~/.zshrc
+```
+
+### Install kubectl plugin
+
+```bash
+kubectl krew install ctx ns
+```