Troubleshooting in Kubernetes: A Strategic Guide

Troubleshooting in Kubernetes: A Strategic Guide

How to debug issues in Kubernetes when things go awry . ContainerCreating or CrashLoppBackOff state having rigorously used Kubernetes for more than three years now, we have been confronted by a long list of issues — all equally subtle and complex — although most of them predominantly fall under the following three umbrellas: 1. Pods stuck in ContainerCreating state . 2. CrashLoopBackOff and periodic restarts. 3. Network connectivity issues

Kubernetes can be a tricky platform, especially when it comes to debugging and troubleshooting issues. Most of this difficulty comes from the lack of detailed error messages and the complexity of the system. Moreover, the sheer number of moving parts in the container orchestration flow — and only a handful of states to represent that flow — adds to the challenge. For instance, as you will see, there are at least six plausible reasons why a Pod could be stuck in the ContainerCreating or CrashLoppBackOff state.

Having rigorously used Kubernetes for more than three years now, we have been confronted by a long list of issues — all equally subtle and complex — although most of them predominantly fall under the following three umbrellas:

  1. Pods stuck in ContainerCreating state
  2. CrashLoopBackOff and periodic restarts
  3. Network connectivity issues

Behind each of these, as you will find out, is a multitude of causes, and this article will help you understand those — and the why behind it. The goal is to not give you a list of commands or tools (that can only solve a set ofproblems)_, _but rather, it’s to elevate your understanding and help build an intuition that can assist you in solving any problemwhen things go awry in Kubernetes.

For most K8s issues in general, the first place to look at is the event log (kubectl get events -n <NAMESPACE>): This captures details about every step in the Kubernetes orchestration that are key to any diagnosis.

software-engineering programming devops kubernetes software-development

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