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Name: Kubernetes Patterns
Author: buildworksai

// Kubernetes deployment patterns for EUCORA including Deployments, Services, ConfigMaps, Secrets, Ingress, and Helm. Use when deploying to Kubernetes, configuring k8s resources, or managing container orchestration.

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updated:January 31, 2026 at 07:14

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Network and Computer Systems AdministratorsComputer and Mathematical Occupations15-1244L4

name	kubernetes-patterns
description	Kubernetes deployment patterns for EUCORA including Deployments, Services, ConfigMaps, Secrets, Ingress, and Helm. Use when deploying to Kubernetes, configuring k8s resources, or managing container orchestration.
status	✅ Working
last-validated	"2026-01-30T00:00:00.000Z"

Kubernetes Patterns

Kubernetes resource patterns for EUCORA production deployments.

Quick Reference

Resource	Pattern
Deployments	RollingUpdate, health probes, resource limits
Services	ClusterIP (internal), LoadBalancer (external)
ConfigMaps	Non-sensitive configuration
Secrets	External Secrets Operator + Vault
Ingress	nginx-ingress + cert-manager
Singleton	Recreate strategy (Celery Beat)

Deployment Patterns

Standard API Deployment

# k8s/backend-deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: eucora-api
  namespace: eucora
  labels:
    app: eucora
    component: api
spec:
  replicas: 3
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 0
  selector:
    matchLabels:
      app: eucora
      component: api
  template:
    metadata:
      labels:
        app: eucora
        component: api
    spec:
      serviceAccountName: eucora-api

      containers:
        - name: api
          image: eucora/backend:latest
          ports:
            - containerPort: 8000
              name: http

          # Environment from ConfigMap/Secret
          envFrom:
            - configMapRef:
                name: eucora-config
            - secretRef:
                name: eucora-secrets

          # Health probes
          livenessProbe:
            httpGet:
              path: /health/live/
              port: http
            initialDelaySeconds: 30
            periodSeconds: 10
            failureThreshold: 3

          readinessProbe:
            httpGet:
              path: /health/ready/
              port: http
            initialDelaySeconds: 5
            periodSeconds: 5
            failureThreshold: 3

          # Resource limits (MANDATORY)
          resources:
            requests:
              cpu: 500m
              memory: 512Mi
            limits:
              cpu: 1000m
              memory: 1Gi

          # Volume mounts
          volumeMounts:
            - name: static-files
              mountPath: /app/staticfiles

      volumes:
        - name: static-files
          persistentVolumeClaim:
            claimName: eucora-static-pvc

      # Pod anti-affinity for HA
      affinity:
        podAntiAffinity:
          preferredDuringSchedulingIgnoredDuringExecution:
            - weight: 100
              podAffinityTerm:
                labelSelector:
                  matchLabels:
                    app: eucora
                    component: api
                topologyKey: kubernetes.io/hostname

Celery Worker Deployment

# k8s/celery-worker-deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: eucora-celery-worker
  namespace: eucora
spec:
  replicas: 2
  strategy:
    type: RollingUpdate
  selector:
    matchLabels:
      app: eucora
      component: celery-worker
  template:
    spec:
      containers:
        - name: worker
          image: eucora/backend:latest
          command: ["celery", "-A", "config", "worker", "-l", "info", "-c", "4"]

          envFrom:
            - configMapRef:
                name: eucora-config
            - secretRef:
                name: eucora-secrets

          resources:
            requests:
              cpu: 250m
              memory: 512Mi
            limits:
              cpu: 1000m
              memory: 1Gi

          # Liveness probe for worker
          livenessProbe:
            exec:
              command:
                - celery
                - -A
                - config
                - inspect
                - ping
            initialDelaySeconds: 60
            periodSeconds: 30
            timeoutSeconds: 10

Celery Beat (Singleton Pattern)

# k8s/celery-beat-deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: eucora-celery-beat
  namespace: eucora
spec:
  replicas: 1  # MUST be 1 - singleton
  strategy:
    type: Recreate  # Prevent duplicate schedulers
  selector:
    matchLabels:
      app: eucora
      component: celery-beat
  template:
    spec:
      containers:
        - name: beat
          image: eucora/backend:latest
          command: ["celery", "-A", "config", "beat", "-l", "info"]

          resources:
            requests:
              cpu: 100m
              memory: 256Mi
            limits:
              cpu: 200m
              memory: 512Mi

Service Patterns

ClusterIP (Internal)

# k8s/api-service.yaml
apiVersion: v1
kind: Service
metadata:
  name: eucora-api
  namespace: eucora
spec:
  type: ClusterIP
  selector:
    app: eucora
    component: api
  ports:
    - name: http
      port: 80
      targetPort: 8000

Headless Service (StatefulSets)

apiVersion: v1
kind: Service
metadata:
  name: eucora-db-headless
spec:
  type: ClusterIP
  clusterIP: None  # Headless
  selector:
    app: eucora
    component: postgres
  ports:
    - port: 5432

ConfigMap and Secrets

ConfigMap (Non-Sensitive)

# k8s/configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: eucora-config
  namespace: eucora
data:
  DEBUG: "False"
  ALLOWED_HOSTS: "eucora.example.com"
  CORS_ALLOWED_ORIGINS: "https://eucora.example.com"
  CELERY_BROKER_URL: "redis://redis:6379/0"
  LOG_LEVEL: "INFO"

External Secrets (Azure Key Vault)

# k8s/external-secret.yaml
apiVersion: external-secrets.io/v1beta1
kind: ExternalSecret
metadata:
  name: eucora-secrets
  namespace: eucora
spec:
  refreshInterval: 1h
  secretStoreRef:
    name: azure-keyvault
    kind: ClusterSecretStore
  target:
    name: eucora-secrets
    creationPolicy: Owner
  data:
    - secretKey: DATABASE_URL
      remoteRef:
        key: eucora-database-url
    - secretKey: SECRET_KEY
      remoteRef:
        key: eucora-django-secret-key
    - secretKey: INTUNE_CLIENT_SECRET
      remoteRef:
        key: eucora-intune-client-secret

Ingress with TLS

# k8s/ingress.yaml
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: eucora-ingress
  namespace: eucora
  annotations:
    kubernetes.io/ingress.class: nginx
    cert-manager.io/cluster-issuer: letsencrypt-prod
    nginx.ingress.kubernetes.io/proxy-body-size: "100m"
    nginx.ingress.kubernetes.io/ssl-redirect: "true"
spec:
  tls:
    - hosts:
        - eucora.example.com
        - api.eucora.example.com
      secretName: eucora-tls
  rules:
    - host: eucora.example.com
      http:
        paths:
          - path: /
            pathType: Prefix
            backend:
              service:
                name: eucora-frontend
                port:
                  number: 80
    - host: api.eucora.example.com
      http:
        paths:
          - path: /
            pathType: Prefix
            backend:
              service:
                name: eucora-api
                port:
                  number: 80

PersistentVolumeClaims

# k8s/pvc.yaml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: eucora-static-pvc
  namespace: eucora
spec:
  accessModes:
    - ReadWriteMany
  storageClassName: azure-file
  resources:
    requests:
      storage: 10Gi
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: eucora-media-pvc
  namespace: eucora
spec:
  accessModes:
    - ReadWriteMany
  storageClassName: azure-file
  resources:
    requests:
      storage: 50Gi

Namespace and RBAC

# k8s/namespace.yaml
apiVersion: v1
kind: Namespace
metadata:
  name: eucora
  labels:
    name: eucora
    environment: production
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: eucora-api
  namespace: eucora
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  name: eucora-api-role
  namespace: eucora
rules:
  - apiGroups: [""]
    resources: ["configmaps", "secrets"]
    verbs: ["get", "list"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: eucora-api-rolebinding
  namespace: eucora
subjects:
  - kind: ServiceAccount
    name: eucora-api
roleRef:
  kind: Role
  name: eucora-api-role
  apiGroup: rbac.authorization.k8s.io

Health Probes

Probe	Purpose	When Fails
Liveness	Is container alive?	Restart container
Readiness	Can accept traffic?	Remove from Service
Startup	Still starting?	Delay liveness checks

livenessProbe:
  httpGet:
    path: /health/live/
    port: 8000
  initialDelaySeconds: 30
  periodSeconds: 10
  failureThreshold: 3

readinessProbe:
  httpGet:
    path: /health/ready/
    port: 8000
  initialDelaySeconds: 5
  periodSeconds: 5
  failureThreshold: 3

startupProbe:
  httpGet:
    path: /health/live/
    port: 8000
  initialDelaySeconds: 10
  periodSeconds: 10
  failureThreshold: 30  # 5 min startup window

Helm Values (Reference)

# values.yaml
replicaCount: 3

image:
  repository: eucora/backend
  tag: latest
  pullPolicy: Always

resources:
  requests:
    cpu: 500m
    memory: 512Mi
  limits:
    cpu: 1000m
    memory: 1Gi

ingress:
  enabled: true
  className: nginx
  annotations:
    cert-manager.io/cluster-issuer: letsencrypt-prod
  hosts:
    - host: eucora.example.com
      paths:
        - path: /
          pathType: Prefix
  tls:
    - secretName: eucora-tls
      hosts:
        - eucora.example.com

postgresql:
  enabled: true
  auth:
    existingSecret: eucora-secrets
    secretKeys:
      adminPasswordKey: POSTGRES_PASSWORD

redis:
  enabled: true
  auth:
    enabled: false

Commands Reference

# Apply manifests
kubectl apply -f k8s/namespace.yaml
kubectl apply -f k8s/

# Check deployment status
kubectl get deployments -n eucora
kubectl rollout status deployment/eucora-api -n eucora

# View logs
kubectl logs -f deployment/eucora-api -n eucora

# Scale deployment
kubectl scale deployment/eucora-api --replicas=5 -n eucora

# Rollback
kubectl rollout undo deployment/eucora-api -n eucora

# Debug pod
kubectl exec -it deployment/eucora-api -n eucora -- /bin/bash

Anti-Patterns

❌ FORBIDDEN	✅ CORRECT
No resource limits	Always set limits
No health probes	Liveness + readiness mandatory
Secrets in ConfigMap	Use External Secrets
Root containers	Run as non-root user
Single replica for API	≥3 replicas for HA
Multiple Celery Beat	Exactly 1 replica (Recreate)

kubernetes-patterns

More from this repository

More from this repository

Kubernetes Patterns

Quick Reference

Deployment Patterns

Standard API Deployment

Celery Worker Deployment

Celery Beat (Singleton Pattern)

Service Patterns

ClusterIP (Internal)

Headless Service (StatefulSets)

ConfigMap and Secrets

ConfigMap (Non-Sensitive)

External Secrets (Azure Key Vault)

Ingress with TLS

PersistentVolumeClaims

Namespace and RBAC

Health Probes

Helm Values (Reference)

Commands Reference

Anti-Patterns

Kubernetes Patterns

Quick Reference

Deployment Patterns

Standard API Deployment

Celery Worker Deployment

Celery Beat (Singleton Pattern)

Service Patterns

ClusterIP (Internal)

Headless Service (StatefulSets)

ConfigMap and Secrets

ConfigMap (Non-Sensitive)

External Secrets (Azure Key Vault)

Ingress with TLS

PersistentVolumeClaims

Namespace and RBAC

Health Probes

Helm Values (Reference)

Commands Reference

Anti-Patterns