Solved: Error from server (Timeout): timeout expired waiting for volumes to attach or mount for pod pod

Blogger Maotouhu () takes you to Go to New World?

Maotouhu recommends a list of necessary technology stacks for programmers:

Cloud native technology Cloud Native:

  • Golang
  • Docker
  • Kubernetes
  • ? Helm
  • Serverless
  • ?AWS Lambda
  • Google Cloud Functions
  • Microservices
  • Envoy
  • Istio
  • Prometheus

Blog homepage:

  • Maotouhu’s blog
  • “Complete Column of Interview Questions” Articles with pictures and texts Vivid images Simple and easy to learn! Everyone is welcome to step in~
  • “IDEA Development Cheats Column” Learn the common operations of IDEA and double your work efficiency~
  • “Master Golang in 100 Days (Basic Introduction)” Learn the Golang language, play cloud native, and travel to large and small factories~

I hope this article can bring you some help The article is superficial, please criticize and correct me!

Article directory

  • “Solved: Error from server (Timeout): timeout expired waiting for volumes to attach or mount for pod ‘pod-name’ (K8s)” ?
    • Summary
    • introduction
    • text
      • The problem goes deep
      • wrong reason
        • Insufficient storage resources
        • Permissions issue
        • Internet problem
      • solution
        • Check storage resources
        • Check permission settings
        • Solve network problems
      • how to avoid
        • Monitoring and Alerting
        • Continuous integration and continuous deployment (CI/CD)
        • Knowledge training
      • Code and table examples
    • Summarize
    • References
  • Original statement

《Resolved: Error from server (Timeout): timeout expired waiting for volumes to attach or mount for pod pod-name’ (K8s) problem》 ?

Abstract

Hi Meow! Under the blue sky of cloud native, our Kubernetes cluster occasionally encounters some dark clouds, such as the problem of Pods timing out while waiting for volumes to be mounted. This bug is like a cat waiting for a door to open, but the door is stuck. In this technical blog, I – your cat head tiger blogger – will take you to learn more about this Kubernetes problem, from the reasons why it happened to the strategies to solve it, to tips to avoid future mistakes. Let us Climb the tree of knowledge together and catch these cunning bugs!

Introduction

Kubernetes, as the most popular container orchestration tool at present, sometimes encounters some thorny problems. One of them is a timeout error when trying to mount a volume to a Pod. This issue can be caused by a variety of factors, including insufficient storage resources, misconfiguration, network issues, etc. Like an owl leaping through the rainforest, we need to be keen to identify the problem and act quickly.

Text

In-depth questions

When we deploy a pod in Kubernetes and try to mount a storage volume, we may encounter the following error:

Error from server (Timeout): timeout expired waiting for volumes to attach or mount for pod "pod-name"

This means that Kubernetes did not complete the volume mount operation within the preset time.

Error reason

Insufficient storage resources

If there are insufficient storage resources available in the cluster, Kubernetes will not be able to allocate the required volumes to the Pod, resulting in a timeout.

Permission issue

Improper permission settings for storage volumes may also cause Pods to fail to mount properly.

Network problems

Network latency or misconfiguration may impede communication within the Kubernetes cluster, affecting volume mounting.

Solution

Check storage resources

Ensure that the Kubernetes cluster has sufficient storage resources to allocate.

kubectl describe storageclass
Check permission settings

Check the permission settings of the storage volume to ensure that the Pod has sufficient permissions to mount it.

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: my-pvc
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      Storage: 1Gi
Solving network problems

Check the network configuration to ensure smooth communication between Pods and external resources.

How to avoid

Monitoring and Alerting

Set up appropriate monitoring and alarms to be notified promptly when storage resources are insufficient or network problems occur.

Continuous Integration and Continuous Deployment (CI/CD)

Through the CI/CD process, ensure the correctness of all configurations before deployment.

Knowledge training

Continuously learn and share Kubernetes best practices to improve the team’s cluster management capabilities.

Code and table examples

Assume we have the following PersistentVolumeClaim (PVC) configuration:

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: my-pvc
spec:
  accessModes:
    - ReadWriteOnce
  storageClassName: standard
  resources:
    requests:
      Storage: 1Gi

Make sure you have a StorageClass named standard in your Kubernetes cluster and have enough storage space available.

Command/Operation Description
kubectl get pvc View all PersistentVolumeClaims
kubectl get pv View all PersistentVolumes
kubectl describe pod pod-name View the detailed information of the Pod, including volume mounting status

Summary

In the cloud-native world, promptly solving the problem of Pod volume mount timeout can help us keep the Kubernetes cluster healthy and running efficiently. By understanding the source of errors, taking corrective action, and implementing effective prevention strategies, we can ensure that these types of issues don’t hinder our development progress. Just like an owl gracefully leaping among the treetops, we can also flexibly manage and maintain our Kubernetes cluster.

Reference materials

  • Kubernetes official documentation: Volumes
  • Kubernetes official documentation: Persistent Volumes
  • Kubernetes official documentation: Troubleshoot Clusters

I hope this blog can help you solve the mount timeout problem in Kubernetes and make your cluster run as smooth as silk, meow! ?

Original Statement

======= ·

  • Original author: Maotouhu
  • Editor: GoCloudNative

Author wx: [libin9iOak]
Public account: Maotouhu technical team

Study Review
? ?

This article is an original article and the copyright belongs to the author. Reprinting, duplication or quotation without permission is prohibited.

The author guarantees the authenticity and reliability of the information,but does not assume responsibility for its accuracy or completeness.

Commercial use without permission is prohibited.

If you have questions or suggestions, please contact the author.

Thank you for your support and respect.

Click on the business card below to join the IT technology core learning team. Explore the future of technology together and grow together.