Debugging Kubernetes

Course details

What do you do when deleting a Kubernetes resource takes way longer than expected? How do you troubleshoot Pods that just won't start no matter what you do? Why is that Kubernetes node not joining your control plane?

If you're a systems administrator, SRE, or platform engineer and ever asked yourself these questions, then this course is for you. Instructor Carlos Nunez helps you resolve common (and not-so-common) problems that can arise while operating a Kubernetes cluster of any size, in any environment. This course will also level up your Kubernetes knowledge by explaining why these issues occur and how to prevent them.

Learning objectives
Learn the cause and solution of common problems that come up while operating a Kubernetes cluster.
Explore Kubernetes fundamentals more deeply as they apply to debugging.

Concepts

0. Introduction

01 - Level up with Kubernetes
02 - What you should know
03 - Setting up your private Docker Hub registry

1. Kubernetes Doesn't Have to Be Hard

04 - Kubernetes is hard. Why
05 - Troubleshooting effectively with the many whys
06 - Finding problems quickly with Spot the Pattern
07 - kubectl, curl, and yq are all you need

2. Creating a Local Kubernetes Cluster

08 - Installing Docker Desktop
09 - Installing kind and troubleshooting tools
10 - Creating clusters with kind

3. Pods and Deployments

11 - Troubleshooting Pods that won't fit in the cluster
12 - Debugging missing Pod tolerations and taints
13 - Conquering Pods with pending dependencies
14 - Debugging ImagePullBackOff errors for non-existent images
15 - Solving network-related ImagePullBackOff errors
16 - Solving ImagePullBackOff errors related to private registries
17 - Debugging CrashLoopBackOff errors and crashing Pods
18 - Debugging failing liveness probes
19 - Solving failing Pod readiness checks
20 - Solving slow Pods
21 - Challenge - A troublemaking deployment
22 - Solution - A troublemaking deployment

4. Networking and Ingress

23 - Conquering DNS misconfigurations within Pods
24 - Debugging Pods running outdated Alpine Linux
25 - Conquering CoreDNS and other DNS issues
26 - Troubleshooting Pod networking
27 - Troubleshooting NetworkPolicies
28 - Debugging unreachable Kubernetes Services
29 - Solving failing Ingress resources
30 - Troubleshooting Ingress resources with unavailable services
31 - Debugging aggressive ingress path types
32 - Challenge - The flaky web app
33 - Solution - The flaky web app

5. Nodes, Control Plane, and the Kubernetes API

34 - Quick refresher on kubeconfig files
35 - Why Kubernetes authentication issues occur
36 - Retrieving data from kubeconfig contexts
37 - Retrieving user certificates from kubeconfig files
38 - Confirming kubeconfig certificate validity
39 - Generating new Kubernetes user certificates
40 - Understanding slow kubectl commands
41 - Understanding NotReady Kubernetes nodes
42 - Identifying kubelets that are not started
43 - Restarting the kubelet service
44 - Troubleshooting missing CNIs
45 - Understanding slow Kubernetes resource deletions
46 - Identifying Kubernetes resource finalizers
47 - Safely removing Kubernetes resource finalizers
48 - Removing finalizers from namespaces

Conclusion

49 - Deploy your next big project on Kubernetes
50 - Provision your own Kubernetes cluster from scratch
51 - Get Kubernetes certified

Debugging Kubernetes

Authors

Carlos Nunez