---
# Namespace for testing
apiVersion: v1
kind: Namespace
metadata:
name: ha-test
---
# ConfigMap with application configuration
apiVersion: v1
kind: ConfigMap
metadata:
name: nginx-config
namespace: ha-test
data:
index.html: |
HA Cluster Test
Kubernetes HA Cluster Test
Pod Hostname:
Timestamp:
Node IP:
---
# Deployment with multiple replicas for HA testing
apiVersion: apps/v1
kind: Deployment
metadata:
name: ha-test-app
namespace: ha-test
labels:
app: ha-test-app
spec:
replicas: 6 # Deploy across multiple nodes
strategy:
type: RollingUpdate
rollingUpdate:
maxUnavailable: 1
maxSurge: 1
selector:
matchLabels:
app: ha-test-app
template:
metadata:
labels:
app: ha-test-app
spec:
# Anti-affinity to spread pods across nodes
affinity:
podAntiAffinity:
preferredDuringSchedulingIgnoredDuringExecution:
- weight: 100
podAffinityTerm:
labelSelector:
matchExpressions:
- key: app
operator: In
values:
- ha-test-app
topologyKey: kubernetes.io/hostname
containers:
- name: nginx
image: nginx:1.25-alpine
ports:
- containerPort: 80
name: http
env:
- name: NODE_NAME
valueFrom:
fieldRef:
fieldPath: spec.nodeName
- name: POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: POD_IP
valueFrom:
fieldRef:
fieldPath: status.podIP
volumeMounts:
- name: nginx-config
mountPath: /usr/share/nginx/html
resources:
requests:
memory: "64Mi"
cpu: "50m"
limits:
memory: "128Mi"
cpu: "100m"
livenessProbe:
httpGet:
path: /
port: 80
initialDelaySeconds: 10
periodSeconds: 10
readinessProbe:
httpGet:
path: /
port: 80
initialDelaySeconds: 5
periodSeconds: 5
volumes:
- name: nginx-config
configMap:
name: nginx-config
---
# Service to expose the deployment
apiVersion: v1
kind: Service
metadata:
name: ha-test-service
namespace: ha-test
labels:
app: ha-test-app
spec:
selector:
app: ha-test-app
ports:
- port: 80
targetPort: 80
protocol: TCP
name: http
type: ClusterIP
---
# NodePort Service for external access (alternative to ingress)
apiVersion: v1
kind: Service
metadata:
name: ha-test-nodeport
namespace: ha-test
labels:
app: ha-test-app
spec:
selector:
app: ha-test-app
ports:
- port: 80
targetPort: 80
nodePort: 30080
protocol: TCP
name: http
type: NodePort
---
# HorizontalPodAutoscaler for testing scaling
apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
name: ha-test-hpa
namespace: ha-test
spec:
scaleTargetRef:
apiVersion: apps/v1
kind: Deployment
name: ha-test-app
minReplicas: 3
maxReplicas: 12
metrics:
- type: Resource
resource:
name: cpu
target:
type: Utilization
averageUtilization: 70
---
# PodDisruptionBudget for HA
apiVersion: policy/v1
kind: PodDisruptionBudget
metadata:
name: ha-test-pdb
namespace: ha-test
spec:
minAvailable: 2
selector:
matchLabels:
app: ha-test-app