Roll Back Safely

Part of the Introduction to Kubernetes section of Coddy's Terminal journey. Lesson 42 of 45.

Challenge

Medium

A release goes wrong: the new tag was never pushed. Practise the recovery. Run these steps one after the other:

Apply deployment.yaml
Update the shop container to the image nginx:broken
List the Pods and see the new ones fail to pull the image
Roll the Deployment back
List the Pods again to see healthy replicas
Check the rollout status

Try it yourself

Terminal

kubectl apply -f deployment.yaml
kubectl apply -f service.yaml
kubectl scale deployment shop --replicas=4
kubectl set image deployment/shop shop=nginx:1.27
kubectl rollout status deployment/shop
kubectl get endpoints shop

All lessons in Introduction to Kubernetes

1Introduction

What Is Kubernetes The Cluster

4Deployments

Creating A Deployment Scaling Deployments From Manifests Updating Images Rolling Back Recap - Deployment Manager

7Configuration

ConfigMaps Secrets Environment Variables Recap - Config Master

10Web Shop Project

Project Overview Write The Deployment

Expose The Shop

Scale And Update

Roll Back Safely Project lesson

2Pods

Running A Pod Listing Pods Describing Pods Deleting Pods Recap - Pod Wrangler

5Services

Exposing A Deployment Service Types Endpoints Recap - Service Desk

8Namespaces & Jobs

Namespaces Working In A Namespace Jobs Recap - Namespace Navigator

11Final Challenges

Cluster Detective Full Rollout Pipeline Broken Deployment Triage

3Manifests

Writing A Manifest Labels Recap - Manifest Writer

6Debugging

Pod Logs Executing Commands Image Pull Errors Crash Loops Recap - Pod Doctor

9Output Formats

Wide And Name Output YAML Output JSONPath Recap - Output Explorer

Practice on your own: Terminal playground