dispaly pod name in Web app SinglePage

[Jean-Baptiste-Lasselle]

• use process.env.XXXX
• andthis Kubernetes official trick (so easy !!:D )

apiVersion: v1
kind: Pod
metadata:
  name: dapi-envars-fieldref
spec:
  containers:
    - name: test-container
      image: k8s.gcr.io/busybox
      command: [ "sh", "-c"]
      args:
      - while true; do
          echo -en '\n';
          printenv MY_NODE_NAME MY_POD_NAME MY_POD_NAMESPACE;
          printenv MY_POD_IP MY_POD_SERVICE_ACCOUNT;
          sleep 10;
        done;
      env:
        - name: MY_NODE_NAME
          valueFrom:
            fieldRef:
              fieldPath: spec.nodeName
        - name: MY_POD_NAME
          valueFrom:
            fieldRef:
              fieldPath: metadata.name
        - name: MY_POD_NAMESPACE
          valueFrom:
            fieldRef:
              fieldPath: metadata.namespace
        - name: MY_POD_IP
          valueFrom:
            fieldRef:
              fieldPath: status.podIP
        - name: MY_POD_SERVICE_ACCOUNT
          valueFrom:
            fieldRef:
              fieldPath: spec.serviceAccountName
  restartPolicy: Never

• found it here : https://kubernetes.io/docs/tasks/inject-data-application/environment-variable-expose-pod-information/
• NowI need to do the same, but within a ReplicaSet :then i will scale up Kaleidoscopic
• and then we can see visually all pods being updated with a new color, by the sidecar in pod
• last thing :
  • create a simple CRD to specifiy a new Color
  • create the sidecar which detects the CRD from KUBE API (events) :
    • I found one technique, using Prometheus (he knows how to detect CRD events),and aprometheus client in the app : https://www.liatrio.com/blog/kubernetes-custom-resource-definitions
  • rancher conf on this subject : https://www.youtube.com/watch?v=7wdUa4Ulwxg
  • What I need to implement aa Kubernetes CRD controller eg.in Rust lang.: https://dzone.com/articles/writing-a-kubernetes-crd-controller-in-rust
  • http://technosophos.com/2019/08/07/writing-a-kubernetes-controller-in-rust.html
  • A Kubernetes Informer in typescript : https://github.com/kubernetes-client/javascript/tree/master/examples/typescript/informer
  • A Kubernetes Watcher in typescript : https://github.com/kubernetes-client/javascript/tree/master/examples/typescript/watch

[Jean-Baptiste-Lasselle]

CRDandK8S API :+1: :

• in page https://kubernetes.io/docs/reference/using-api/api-concepts/CTRL+F crdand I have otherinformations