Kubernetes Manifests

Kubernetes Manifests

Overview

Generate production-ready Kubernetes manifests following AgentStack conventions and best practices for deploying on any K8s distribution.

Directory Structure

deployments/
├── base/                    # Base manifests (kustomize)
│   ├── kustomization.yaml
│   ├── namespace.yaml
│   ├── api-gateway/
│   │   ├── deployment.yaml
│   │   ├── service.yaml
│   │   └── hpa.yaml
│   ├── worker/
│   └── common/
│       ├── configmap.yaml
│       └── secrets.yaml
├── overlays/
│   ├── dev/
│   │   └── kustomization.yaml
│   ├── staging/
│   │   └── kustomization.yaml
│   └── prod/
│       └── kustomization.yaml
└── crds/                    # Custom Resource Definitions

Core Manifest Patterns

Deployment

apiVersion: apps/v1
kind: Deployment
metadata:
  name: agentstack-api
  namespace: agentstack
  labels:
    app.kubernetes.io/name: agentstack-api
    app.kubernetes.io/component: api
    app.kubernetes.io/part-of: agentstack
    app.kubernetes.io/version: "1.0.0"
spec:
  replicas: 3
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 0
  selector:
    matchLabels:
      app.kubernetes.io/name: agentstack-api
  template:
    metadata:
      labels:
        app.kubernetes.io/name: agentstack-api
      annotations:
        prometheus.io/scrape: "true"
        prometheus.io/port: "9090"
        prometheus.io/path: "/metrics"
    spec:
      serviceAccountName: agentstack-api
      securityContext:
        runAsNonRoot: true
        runAsUser: 1000
        fsGroup: 1000
      containers:
        - name: api
          image: ghcr.io/raphaelmansuy/agentstack-api:v1.0.0
          imagePullPolicy: IfNotPresent
          ports:
            - name: http
              containerPort: 8080
              protocol: TCP
            - name: metrics
              containerPort: 9090
              protocol: TCP
          env:
            - name: POD_NAME
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
            - name: POD_NAMESPACE
              valueFrom:
                fieldRef:
                  fieldPath: metadata.namespace
          envFrom:
            - configMapRef:
                name: agentstack-config
            - secretRef:
                name: agentstack-secrets
          resources:
            requests:
              cpu: 100m
              memory: 256Mi
            limits:
              cpu: 1000m
              memory: 1Gi
          livenessProbe:
            httpGet:
              path: /health
              port: http
            initialDelaySeconds: 10
            periodSeconds: 10
            timeoutSeconds: 5
            failureThreshold: 3
          readinessProbe:
            httpGet:
              path: /ready
              port: http
            initialDelaySeconds: 5
            periodSeconds: 5
            timeoutSeconds: 3
            failureThreshold: 3
          securityContext:
            allowPrivilegeEscalation: false
            readOnlyRootFilesystem: true
            capabilities:
              drop:
                - ALL
          volumeMounts:
            - name: tmp
              mountPath: /tmp
      volumes:
        - name: tmp
          emptyDir: {}
      affinity:
        podAntiAffinity:
          preferredDuringSchedulingIgnoredDuringExecution:
            - weight: 100
              podAffinityTerm:
                labelSelector:
                  matchLabels:
                    app.kubernetes.io/name: agentstack-api
                topologyKey: kubernetes.io/hostname

Service

apiVersion: v1
kind: Service
metadata:
  name: agentstack-api
  namespace: agentstack
  labels:
    app.kubernetes.io/name: agentstack-api
spec:
  type: ClusterIP
  ports:
    - name: http
      port: 80
      targetPort: http
      protocol: TCP
    - name: metrics
      port: 9090
      targetPort: metrics
      protocol: TCP
  selector:
    app.kubernetes.io/name: agentstack-api

ConfigMap

apiVersion: v1
kind: ConfigMap
metadata:
  name: agentstack-config
  namespace: agentstack
data:
  LOG_LEVEL: "info"
  LOG_FORMAT: "json"
  HTTP_PORT: "8080"
  METRICS_PORT: "9090"
  DATABASE_HOST: "postgres.agentstack.svc.cluster.local"
  DATABASE_PORT: "5432"
  DATABASE_NAME: "agentstack"
  REDIS_HOST: "redis.agentstack.svc.cluster.local"
  REDIS_PORT: "6379"
  OTEL_EXPORTER_OTLP_ENDPOINT: "http://otel-collector.observability:4317"

Secret (with External Secrets Operator)

apiVersion: external-secrets.io/v1beta1
kind: ExternalSecret
metadata:
  name: agentstack-secrets
  namespace: agentstack
spec:
  refreshInterval: 1h
  secretStoreRef:
    name: vault-backend
    kind: ClusterSecretStore
  target:
    name: agentstack-secrets
    creationPolicy: Owner
  data:
    - secretKey: DATABASE_PASSWORD
      remoteRef:
        key: agentstack/database
        property: password
    - secretKey: JWT_SECRET
      remoteRef:
        key: agentstack/auth
        property: jwt_secret
    - secretKey: REDIS_PASSWORD
      remoteRef:
        key: agentstack/redis
        property: password

HorizontalPodAutoscaler

apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
  name: agentstack-api
  namespace: agentstack
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: agentstack-api
  minReplicas: 3
  maxReplicas: 20
  metrics:
    - type: Resource
      resource:
        name: cpu
        target:
          type: Utilization
          averageUtilization: 70
    - type: Resource
      resource:
        name: memory
        target:
          type: Utilization
          averageUtilization: 80
  behavior:
    scaleDown:
      stabilizationWindowSeconds: 300
      policies:
        - type: Percent
          value: 10
          periodSeconds: 60
    scaleUp:
      stabilizationWindowSeconds: 0
      policies:
        - type: Percent
          value: 100
          periodSeconds: 15
        - type: Pods
          value: 4
          periodSeconds: 15
      selectPolicy: Max

PodDisruptionBudget

apiVersion: policy/v1
kind: PodDisruptionBudget
metadata:
  name: agentstack-api
  namespace: agentstack
spec:
  minAvailable: 2
  selector:
    matchLabels:
      app.kubernetes.io/name: agentstack-api

RBAC Pattern

# ServiceAccount
apiVersion: v1
kind: ServiceAccount
metadata:
  name: agentstack-api
  namespace: agentstack
---
# Role for namespace-scoped permissions
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  name: agentstack-api
  namespace: agentstack
rules:
  - apiGroups: [""]
    resources: ["configmaps", "secrets"]
    verbs: ["get", "list", "watch"]
  - apiGroups: [""]
    resources: ["pods"]
    verbs: ["get", "list"]
---
# RoleBinding
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: agentstack-api
  namespace: agentstack
subjects:
  - kind: ServiceAccount
    name: agentstack-api
    namespace: agentstack
roleRef:
  kind: Role
  name: agentstack-api
  apiGroup: rbac.authorization.k8s.io

Network Policy

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: agentstack-api
  namespace: agentstack
spec:
  podSelector:
    matchLabels:
      app.kubernetes.io/name: agentstack-api
  policyTypes:
    - Ingress
    - Egress
  ingress:
    - from:
        - namespaceSelector:
            matchLabels:
              name: ingress
        - podSelector:
            matchLabels:
              app.kubernetes.io/name: envoy
      ports:
        - protocol: TCP
          port: 8080
  egress:
    - to:
        - podSelector:
            matchLabels:
              app.kubernetes.io/name: postgres
      ports:
        - protocol: TCP
          port: 5432
    - to:
        - podSelector:
            matchLabels:
              app.kubernetes.io/name: redis
      ports:
        - protocol: TCP
          port: 6379
    - to:
        - namespaceSelector: {}
      ports:
        - protocol: UDP
          port: 53  # DNS

Kustomization

# deployments/base/kustomization.yaml
apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization

namespace: agentstack

resources:
  - namespace.yaml
  - api-gateway/deployment.yaml
  - api-gateway/service.yaml
  - api-gateway/hpa.yaml
  - common/configmap.yaml

commonLabels:
  app.kubernetes.io/part-of: agentstack
  app.kubernetes.io/managed-by: kustomize

# deployments/overlays/prod/kustomization.yaml
apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization

namespace: agentstack-prod

resources:
  - ../../base

namePrefix: prod-

patches:
  - path: replicas-patch.yaml
  - path: resources-patch.yaml

configMapGenerator:
  - name: agentstack-config
    behavior: merge
    literals:
      - LOG_LEVEL=warn

Resources

• references/gateway-api.md - Gateway API for ingress
• references/security-hardening.md - Security best practices
• assets/ - Template manifests for common patterns

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