How to have input data ready for apps on K8S
How to have the input data ready before I deploy a POD on K8S? As I understand, persistent volume is dynamically created using PVC (persistent volume claim), so in a POD yaml file, we can set the PVC and mount path like this:
apiVersion: v1 kind: Pod metadata: name: mypod spec: containers: - name: myfrontend image: nginx volumeMounts: - mountPath: "/var/www/html" name: mypd volumes: - name: mypd persistentVolumeClaim: claimName: myclaim
The problem is, how can I upload the data before I deploy a POD? What I want is to have the data ready and persistent somewhere on K8S, and then when I deploy the POD, and expose it as service, the service can immediately access the data.
Mount it on another pod somewhere that does the pre-load. Alternatively you could do some fancy stuff with an initContainer.
Inject Data Into Applications, Specify configuration and other data for the Pods that run your workload. Exposing an app to the internet automatically using a single IP. A publicly exposed app is an app with a public IP and port, open for inbound (and outbound) traffic. Exposing a service to the internet using a LoadBalancer type, provisions a new public IP, and assigns it to the service. If you have just a few services, this is the right course
According to your description, you need is a persistent volume. An example of this would be a NFS persistence for which you would define the following yaml.
--- apiVersion: v1 kind: PersistentVolume metadata: name: $PV_NAME namespace: $NAMESPACE spec: storageClassName: manual capacity: storage: 1Gi accessModes: - ReadWriteOnce nfs: path: /nfs server: $SERVER_ADDRESS # 10.128.15.222 for instance persistentVolumeReclaimPolicy: Retain --- apiVersion: v1 kind: PersistentVolumeClaim metadata: name: $PVC_NAME creationTimestamp: null labels: app: $PVC_NAME namespace: $NAMESPACE spec: storageClassName: manual accessModes: - ReadWriteOnce resources: requests: storage: 1Gi
After creating a PV and PVC, you would mount it in a deployment like this.
--- apiVersion: apps/v1 kind: Deployment metadata: name: $POD_NAME labels: app: $POD_NAME namespace: $NAMESPACE spec: replicas: 1 selector: matchLabels: app: $POD_NAME template: metadata: creationTimestamp: null labels: app: $POD_NAME spec: containers: - name: $POD_NAME image: $DOCKER_IMAGE volumeMounts: - mountPath: /testing-path name: $VOLUME_NAME volumes: - name: $VOLUME_NAME persistentVolumeClaim: claimName: $PVC_NAME
Managing Resources, Kubernetes provides a number of tools to help you manage your application Organizing resource configurations Many applications require Inject Data Into Applications Then we grep only the "service", and then print it with kubectl get . NAME READY STATUS RESTARTS AGE APP TIER ROLE Tutorial: Create an Application Gateway ingress controller in Azure Kubernetes Service. 03/09/2020; 14 minutes to read; In this article. Azure Kubernetes Service (AKS) manages your hosted Kubernetes environment. AKS makes it quick and easy to deploy and manage containerized applications without container orchestration expertise.
Thank you Guys, so following coderanger and Rodrigo Loza's suggestions, I was able to create a NAS file system and mount it onto multiple PODs. One POD can be used to pre-load the data. Other POD then can access it when data is ready. I'm from HPC background, knowing clearly where is storage is my hobby.
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