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This article mainly explains "how to verify PV and PVC in kubernetes". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "how to verify PV and PVC in kubernetes".

Storage and usage storage are separated by PV and PVC in K8s

Pv is storage space, which is classified by StorageClass

Pvc is a storage volume declaration that represents a user's request to use storage, including space size, specific access mode, etc.

PVC can be used as a kind of data volume and hung to a container or container group.

There are static and dynamic ways to provide PV for PVC

Static: artificially created a series of PV that contain the actual stored specific information and are visible to cluster users

Dynamic: when the appropriate StorageClass is configured and the PVC is associated with the StorageClass, the k8s cluster can dynamically create the PV for the application

When the user creates a PVC,k8s, it immediately matches a PV for it and binds the two together. The binding relationship between PVC and PV is an one-to-one mapping.

Without a suitable PV,PVC, you will stay in the unbound state until a suitable PV is available.

Here, the NFS service is used to provide web page storage to nginx, verifying PV and PVC

The environment is that the nfs server is installed on the k8s 1.20.1 master node, and the nfs client is installed on other node nodes

1. Install nfs on ubuntu 18.04

Server side:

Apt install nfs-kernel-server

Create a shared directory

Mkdir-p / mnt/nfs

Vi / etc/exports

/ mnt/nfs * (rw,sync,no_root_squash)

Restart the service

Systemctl rpcbind restart

Systemctl nfs-server status

Confirm that the NFS server starts successfully:

Rpcinfo-p

Check whether the NFS server mounts the directory / mnt/nfs/ that we want to share

Exportfs

Showmount-e localhost # display output list

Client side:

Apt install nfs-common

Mount-t nfs-o vers=4.1 192.168.33.10:/mnt/nfs / data

View the server shared directory

Showmount-e 192.168.33.10

The client queries the mount situation

Df-h

Rpcinfo-p 192.168.33.10

View NFS version

Server-side use: nfsstat-s

Client uses: nfsstat-c

Second, configure and verify PV and PVC on K8s

Configuration file

Vi pv-lb-nginx.yaml

ApiVersion: apps/v1kind: Deploymentmetadata: name: nginx-webspec: selector: matchLabels: run: nginx-web replicas: 1 template: metadata: labels: run: nginx-webspec: containers:-name: nginx-web image: nginx ports:-containerPort: 80 volumeMounts:-mountPath: / etc/nginx/conf.d # nginx container Set directory name: configfile # custom name 1-mountPath: / usr/share/nginx/html # web page directory in the nginx container name: webroot # custom name 2 volumes:-name: configfile # must be consistent with the above custom name 1 configMap: name: nginx-config # specify the name of configmap-name: webroot # and above Face Custom name 2 consistent persistentVolumeClaim: claimName: nfs-pvc # specifies the name of the pvc-apiVersion: v1kind: Servicemetadata: name: nginx-web labels: run: nginx-webspec: type: LoadBalancer ports:-port: 80 targetPort: 80 protocol: TCP name: http selector: run: nginx-web--- # statement pv details Settings apiVersion: v1kind: PersistentVolumemetadata: name: nfs-pvspec: capacity: Storage: 1Gi volumeMode: Filesystem accessModes:-ReadWriteMany persistentVolumeReclaimPolicy: Retain nfs: server: 192.168.33.10 path: "/ mnt/nfs"-- # declare pv requirements apiVersion: v1kind: PersistentVolumeClaimmetadata: name: nfs-pvcspec: accessModes:-ReadWriteMany resources: requests: storage: 1Giluto-# declare configmap for nginx configuration apiVersion: v1kind: ConfigMapmetadata: name: nginx-configdata: nginx.conf: |-server {listen 80 Listen [:]: 80; server_name localhost; location / {root / usr/share/nginx/html; index index.html index.htm;} error_page 500 502 503 504 / 50x.html; location = / 50x.html {root / usr/share/nginx/html;}}

Kubect apply-f pv-lb-nginx.yaml

Check the deployment status:

Kubectl get svc

Kubectl get pods

Kubectl get pv

Kubectl get pvc

If something goes wrong, kubectl describe will check its events.

Verify, open the browser to visit nginx, and see the content of your configured web page.

Thank you for your reading, the above is the content of "how to verify PV and PVC in kubernetes". After the study of this article, I believe you have a deeper understanding of how to verify PV and PVC in kubernetes. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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