File contents Kubernetes Manifests
Complete Deployment Stack
apiVersion: apps/v1
kind: Deployment
metadata:
name: app
labels:
app: app
spec:
replicas: 3
selector:
matchLabels:
app: app
template:
metadata:
labels:
app: app
spec:
containers:
- name: app
image: ghcr.io/org/app:latest
ports:
- containerPort: 3000
resources:
requests:
memory: "128Mi"
cpu: "100m"
limits:
memory: "256Mi"
cpu: "500m"
livenessProbe:
httpGet:
path: /health
port: 3000
initialDelaySeconds: 10
periodSeconds: 10
readinessProbe:
httpGet:
path: /ready
port: 3000
initialDelaySeconds: 5
periodSeconds: 5
env:
- name: DATABASE_URL
valueFrom:
secretKeyRef:
name: app-secrets
key: database-url
---
apiVersion: v1
kind: Service
metadata:
name: app
spec:
selector:
app: app
ports:
- port: 80
targetPort: 3000
type: ClusterIP
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: app
annotations:
cert-manager.io/cluster-issuer: letsencrypt-prod
spec:
ingressClassName: nginx
tls:
- hosts: [app.example.com]
secretName: app-tls
rules:
- host: app.example.com
http:
paths:
- path: /
pathType: Prefix
backend:
service:
name: app
port:
number: 80
ConfigMap and Secrets
apiVersion: v1
kind: ConfigMap
metadata:
name: app-config
data:
LOG_LEVEL: "info"
API_TIMEOUT: "30s"
---
apiVersion: v1
kind: Secret
metadata:
name: app-secrets
type: Opaque
stringData:
database-url: "postgres://user:pass@host:5432/db"
Horizontal Pod Autoscaler
apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
name: app-hpa
spec:
scaleTargetRef:
apiVersion: apps/v1
kind: Deployment
name: app
minReplicas: 2
maxReplicas: 10
metrics:
- type: Resource
resource:
name: cpu
target:
type: Utilization
averageUtilization: 70
Quick Reference
Resource
Purpose
Deployment
Manages ReplicaSets, rolling updates
Service
Internal load balancing, DNS
Ingress
External HTTP/HTTPS routing
ConfigMap
Non-sensitive configuration
Secret
Sensitive data (base64 encoded)
HPA
Auto-scaling based on metrics
PVC
Persistent storage claims
Common kubectl Commands
kubectl apply -f deployment.yaml
kubectl get pods -l app=app
kubectl describe pod <pod-name>
kubectl logs -f <pod-name>
kubectl exec -it <pod-name> -- /bin/sh
kubectl rollout status deployment/app
kubectl rollout undo deployment/app
1 --- 2 name: 504-kubernetes-7da17b4e 3 description: Kubernetes Manifests 4 --- 5 # Kubernetes Manifests 6 7 ## Complete Deployment Stack 8 9 ```yaml 10 apiVersion: apps/v1 11 kind: Deployment 12 metadata: 13 name: app 14 labels: 15 app: app 16 spec: 17 replicas: 3 18 selector: 19 matchLabels: 20 app: app 21 template: 22 metadata: 23 labels: 24 app: app 25 spec: 26 containers: 27 - name: app 28 image: ghcr.io/org/app:latest 29 ports: 30 - containerPort: 3000 31 resources: 32 requests: 33 memory: "128Mi" 34 cpu: "100m" 35 limits: 36 memory: "256Mi" 37 cpu: "500m" 38 livenessProbe: 39 httpGet: 40 path: /health 41 port: 3000 42 initialDelaySeconds: 10 43 periodSeconds: 10 44 readinessProbe: 45 httpGet: 46 path: /ready 47 port: 3000 48 initialDelaySeconds: 5 49 periodSeconds: 5 50 env: 51 - name: DATABASE_URL 52 valueFrom: 53 secretKeyRef: 54 name: app-secrets 55 key: database-url 56 --- 57 apiVersion: v1 58 kind: Service 59 metadata: 60 name: app 61 spec: 62 selector: 63 app: app 64 ports: 65 - port: 80 66 targetPort: 3000 67 type: ClusterIP 68 --- 69 apiVersion: networking.k8s.io/v1 70 kind: Ingress 71 metadata: 72 name: app 73 annotations: 74 cert-manager.io/cluster-issuer: letsencrypt-prod 75 spec: 76 ingressClassName: nginx 77 tls: 78 - hosts: [app.example.com] 79 secretName: app-tls 80 rules: 81 - host: app.example.com 82 http: 83 paths: 84 - path: / 85 pathType: Prefix 86 backend: 87 service: 88 name: app 89 port: 90 number: 80 91 ``` 92 93 ## ConfigMap and Secrets 94 95 ```yaml 96 apiVersion: v1 97 kind: ConfigMap 98 metadata: 99 name: app-config 100 data: 101 LOG_LEVEL: "info" 102 API_TIMEOUT: "30s" 103 --- 104 apiVersion: v1 105 kind: Secret 106 metadata: 107 name: app-secrets 108 type: Opaque 109 stringData: 110 database-url: "postgres://user:pass@host:5432/db" 111 ``` 112 113 ## Horizontal Pod Autoscaler 114 115 ```yaml 116 apiVersion: autoscaling/v2 117 kind: HorizontalPodAutoscaler 118 metadata: 119 name: app-hpa 120 spec: 121 scaleTargetRef: 122 apiVersion: apps/v1 123 kind: Deployment 124 name: app 125 minReplicas: 2 126 maxReplicas: 10 127 metrics: 128 - type: Resource 129 resource: 130 name: cpu 131 target: 132 type: Utilization 133 averageUtilization: 70 134 ``` 135 136 ## Quick Reference 137 138 | Resource | Purpose | 139 |----------|---------| 140 | Deployment | Manages ReplicaSets, rolling updates | 141 | Service | Internal load balancing, DNS | 142 | Ingress | External HTTP/HTTPS routing | 143 | ConfigMap | Non-sensitive configuration | 144 | Secret | Sensitive data (base64 encoded) | 145 | HPA | Auto-scaling based on metrics | 146 | PVC | Persistent storage claims | 147 148 ## Common kubectl Commands 149 150 ```bash 151 kubectl apply -f deployment.yaml 152 kubectl get pods -l app=app 153 kubectl describe pod <pod-name> 154 kubectl logs -f <pod-name> 155 kubectl exec -it <pod-name> -- /bin/sh 156 kubectl rollout status deployment/app 157 kubectl rollout undo deployment/app 158 ```
commit 1bb44f7c65
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