Скачать или смотреть How to use volumes ? PV and PVC || Lec 9 || Part03 || Kubernetes

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In this video, I will explain how we can use hostPath volume and emptyDir volume and how they works with practical example
What is the main difference between them with practical examples

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Kubernetes is one of the most popular tools in DevOps 🔥
In this video you will learn:
1) How HostPath retain the data?
2) How HostPath volume work with different nodes
3) HostPath and EmptyDIr difference
4) EmptyDir volume with sidecar containers

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Solution


====================================
YAML
====================================
HOSTPATH

PV YAML

apiVersion: v1
kind: PersistentVolume
metadata:
name: my-pv-hostpath
spec:
capacity:
storage: 2Gi
accessModes:
ReadWriteMany
persistentVolumeReclaimPolicy: Retain
hostPath:
path: /data/ my-pv-hostpath


PVC YAML

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: my-pvc-hostpath
spec:
accessModes:
ReadWriteMany
resources:
requests:
storage: 1Gi
volumeName: my-pv-hostpath


POD YAML

apiVersion: v1
kind: Pod
metadata:
name: nginx-webserver
spec:
containers:
image: nginx
name: webserver
imagePullPolicy: IfNotPresent
ports:
containerPort: 80
name: http
volumeMounts:
mountPath: /usr/share/nginx/html
name: app-data
volumes:
name: app-data
persistentVolumeClaim:
claimName: my-pvc-hostpath

EMPTYDIR

POD YAML

apiVersion: v1
kind: Pod
metadata:
name: pod-emptydir
spec:
containers:
image: nginx
name: pod-emptydir
imagePullPolicy: IfNotPresent
volumeMounts:
mountPath: /usr/share/nginx/html
name: emptydir-vol
volumes:
name: emptydir-vol
emptyDir:
sizeLimit: 500Mi


OLD SIDECAR POD LECTURE

apiVersion: v1
kind: Pod
metadata:
name: simple-webapp
labels:
app: webapp
spec:
containers:
name: main-application
image: nginx
volumeMounts:
name: shared-logs
mountPath: /var/log/nginx
name: sidecar-container
image: busybox
command: ["sh","-c","while true; do cat /var/log/nginx/access.log; sleep 2; done"]
volumeMounts:
name: shared-logs
mountPath: /var/log/nginx
volumes:
name: shared-logs
emptyDir: {}

HOW TO CHECK TAINT ON NODE:
kubectl describe nodes k8s-worker | grep Taint

HOW TO SET TAINT ON NODE:
kubectl taint nodes k8s-worker key1=value1:NoSchedule

HOW TO REMOVE TAINT FROM NODE:
kubectl taint nodes k8s-worker key1=value1:NoSchedule-

CREATE YAML FILE:
vim pv-pvc.yaml

HOW TO APPLY YAML:
kubectl apply -f pv-pvc.yaml

HOW TO CHECK PV & PVC:
kubectl get pv,pvc -o wide

HOW TO CHECK PV EVENTS:
kubectl describe pv PV-NAME

HOW TO CHECK PVC EVENTS:
kubectl describe pvc PVC-NAME