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This article will explain in detail how to understand hostPath Volume. The content of the article is of high quality, so the editor shares it for you as a reference. I hope you will have a certain understanding of the relevant knowledge after reading this article.

HostPath Volume

The role of hostPath Volume is to mount a directory that already exists in the Docker Host file system to the container of Pod. Most applications will not use hostPath Volume because it actually increases the coupling between Pod and nodes and limits the use of Pod. However, applications that need access to Kubernetes or Docker internal data (configuration files and binary libraries) need to use hostPath.

For example, kube-apiserver and kube-controller-manager are such applications, through

Kubectl edit-namespace=kube-system pod kube-apiserver-k8s-master

To view the configuration of kube-apiserver Pod, here is the relevant part of Volume:

Three hostPath volume k8s, certs, and pki are defined here, corresponding to the Host directories / etc/kubernetes, / etc/ssl/certs, and / etc/pki, respectively.

If the Pod is destroyed, the directory corresponding to the hostPath will also be retained, so from this point of view, hostPath is more persistent than emptyDir. But once Host crashes, hostPath becomes inaccessible.

On how to understand hostPath Volume to share here, I hope that the above content can be of some help to you, can learn more knowledge. If you think the article is good, you can share it for more people to see.

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