Kubernetes volume hostPath explained with examples

Spread the Knowledge

The hostPath volume mounts a resource from the host node filesystem. the resources could be directory, file socket, character, or block device. These resources mu
A hostPath volume mounts a file or directory from the host node’s filesystem into your pod.
A hostPath PersistentVolume must be used only in a single-node cluster. Kubernetes does not support hostPath on a multi-node cluster currently.
The directories created on the underlying hosts are only writable by root. You either need to run your process as root in a privileged container or modify the file permissions on the host to be able to write to a hostPath volume

Uses for a hostPath are:

This is not something that most Pods will need, but it offers a powerful escape hatch for some applications.
Deploying some Node Specific files through pod
Running a container that needs access to Docker internals; use a hostPath of /var/lib/docker
Allowing a Pod to specify whether a given hostPath should exist prior to the Pod running, whether it should be created, and what it should exist as

Example

apiVersion: v1
kind: Pod
metadata:
  name: test-pd
spec:
  containers:
  - image: k8s.gcr.io/test-webserver
    name: test-container
    volumeMounts:
    - mountPath: /test-pd
      name: test-volume
  volumes:
  - name: test-volume
    hostPath:
      # directory location on host
      path: /data
      # this field is optional
      type: DirectoryOrCreate

Kubernetes Tutorials using EKS – Part 1 – Introduction and Architecture

Kubernetes Tutorials using EKS – Part 2 – Architecture with Master and worker

Kubernetes Tutorials using EKS – Part 3 – Architecture with POD – RC – Deploy – Service

Kubernetes Tutorials using EKS – Part 4 – Setup AWS EKS Clustor

Kubernetes Tutorials using EKS – Part 5 – Namespaces and PODs

Kubernetes Tutorials using EKS – Part 7 – Services

Kubernetes Tutorials using EKS – Part 8 – Volume

Kubernetes Tutorials using EKS – Part 9 – Volume

Kubernetes Tutorials using EKS – Part 10 – Helm and Networking

Facebook Notice for EU! You need to login to view and post FB Comments!

Author
Recent Posts

Rajesh Kumar

Mentor for DevOps - DevSecOps - SRE - Cloud - Container & Micorservices at Cotocus

Website - www.RajeshKumar.xyz
Email - Contact@DevOpsSchool.com

I can help in the following:
- DevOps - DevSecOps - SRE
- Continuous Integration & Delivery
- Continuous Deployment & Inspection
- Technical Debt Reduction
- Containerization/Micro Services Using Kubernetes & Docker
- Cloud Migration using AWS-Azure-GoogleCloud
- Enterprise observability