container_aria

my file learn about tech container (docker, podman, kubernetes)

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donward API

• konfigurasi yang kita set secara manual bisa ditangani dengan baik menggunakan configMap dan secret
  • namun bagaimana dengan konfigurasi yang dinamis? seperti informasi Pod dan Node?
  • kuberntes memiliki downward API. Downward API bisa memungkinakan kita mengambil informasi seputar Pod dan Node melalui environment variable
• jangan bingung dengan kata API, Downward API sendiri bukan RESTful API
  • ini hanya cara untuk mendapatkan informasi seputar Pod dan Node

metadata

• requests.cpu => jumlah CPU yang di request
• requests.memory => jumlah Memory yang di request
• limits.cpu => jumlah limit maksimal CPU

• limits.memory => jumlah limit maksimal Memory

• metadata.name => nama pod
• metadata.namespace => namespace pod
• metadata.uid => id pod
• metadata.labells[‘'] => label pod

• metadata.annotations[‘'] => anotation pod

• status.podIP => ip address pod
• spec.serviceAccountName => name service account pod
• spec.nodeName => nama Node
• status.nostIP => ip address node

configuration

example

apiVersion: v1
kind: ConfigMap
metadata:
  name: nodejs-env-config
data:
  APPLICATION: My Cool Application
  VERSION: 1.0.0

---

apiVersion: apps/v1
kind: ReplicaSet
metadata:
  name: nodejs-env
spec:
  replicas: 3
  selector:
    matchLabels:
      name: nodejs-env
  template:
    metadata:
      name: nodejs-env
      labels:
        name: nodejs-env
    spec:
      containers:
        - name: nodejs-env
          image: khannedy/nodejs-env
          ports:
            - containerPort: 3000
          envFrom:
            - configMapRef:
                name: nodejs-env-config
          env:
            - name: POD_NAME
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
            - name: POD_NAMESPACE
              valueFrom:
                fieldRef:
                  fieldPath: metadata.namespace
            - name: POD_IP
              valueFrom:
                fieldRef:
                  fieldPath: status.podIP
            - name: POD_NODE
              valueFrom:
                fieldRef:
                  fieldPath: spec.nodeName
            - name: POD_NODE_IP
              valueFrom:
                fieldRef:
                  fieldPath: status.hostIP
---

apiVersion: v1
kind: Service
metadata:
  name: nodejs-env-service
spec:
  type: NodePort
  selector:
    name: nodejs-env
  ports:
    - port: 3000
      targetPort: 3000
      nodePort: 30001