beginner · ~8 min

Pods that heal

A lone pod has no one looking after it. A Deployment does: you declare how many copies (replicas) you want and of which image, and its controller keeps reality matching — making pods when there are too few and removing them when there are too many.

Under the hood a Deployment makes a ReplicaSet, and the ReplicaSet makes the pods. Their names show the chain: web-<template hash>-<random>.

Your pod from the last mission is still here. Replace it with something that heals.

Objectives

Create a deployment called web running 3 replicas of nginx:1.27
Delete the lone pod called web
Delete one of the deployment's pods and watch it come back
Bonus: Look at the ReplicaSet the deployment made

Best on a computer with a keyboard. It works on a phone, with shortcuts under the terminal.