Build: Create and deploy a Helm chart

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◆ Before you start

Prerequisites

Helm 3.14+Required
helm version
kubectl + clusterRequired
kubectl cluster-info

⛵

Step 1 of 1

Create and deploy a Helm chart

Scaffold a Helm chart, template Kubernetes manifests, manage values for multiple environments.

Tasks

Scaffold a chart with helm create myapp

Customize deployment template with configurable replicas and resources

Create values-dev.yaml and values-prod.yaml overlays

Add a pre-install hook for DB migrations

Package the chart and push to an OCI registry

🎯 What You'll Learn

▸Create a chart with deployment, service, and ingress templates
▸Override values per environment with -f values-prod.yaml
▸Use Helm hooks for database migrations

Code

YAMLvalues.yaml
1 # Default values for myapp Helm chart
2  
3 replicaCount: 2
4  
5 image:
6   repository: ghcr.io/myorg/myapp
7   tag: ""  # Defaults to chart appVersion
8   pullPolicy: IfNotPresent
9  
10 service:
11   type: ClusterIP
12   port: 80
13   targetPort: 8080
14  
15 ingress:
16   enabled: true
17   className: nginx
18   host: myapp.example.com
19   tls:
20     enabled: true
21     secretName: myapp-tls
22  
23 resources:
24   requests:
25     cpu: 100m
26     memory: 128Mi
27   limits:
28     cpu: 500m
29     memory: 512Mi
30  
31 autoscaling:
32   enabled: false
33   minReplicas: 2
34   maxReplicas: 10
35   targetCPUUtilizationPercentage: 70
36  
37 env:
38   LOG_LEVEL: info
39   APP_ENV: production
40  
41 secrets: {}
42   # DATABASE_URL: ""  # Set via --set or external-secrets
43  
44 livenessProbe:
45   httpGet:
46     path: /healthz
47     port: 8080
48   initialDelaySeconds: 15
49   periodSeconds: 10
50  
51 readinessProbe:
52   httpGet:
53     path: /ready
54     port: 8080
55   initialDelaySeconds: 5
56   periodSeconds: 5
57

💡 Pro Tips

▸Use .Values.global for cross-chart shared values in umbrella charts
▸Run helm template . | kubectl apply --dry-run=server to validate before installing

Discussion

1 # Default values for myapp Helm chart 2 3 replicaCount: 2 4 5 image: 6 repository: ghcr.io/myorg/myapp 7 tag: "" # Defaults to chart appVersion 8 pullPolicy: IfNotPresent 9 10 service: 11 type: ClusterIP 12 port: 80 13 targetPort: 8080 14 15 ingress: 16 enabled: true 17 className: nginx 18 host: myapp.example.com 19 tls: 20 enabled: true 21 secretName: myapp-tls 22 23 resources: 24 requests: 25 cpu: 100m 26 memory: 128Mi 27 limits: 28 cpu: 500m 29 memory: 512Mi 30 31 autoscaling: 32 enabled: false 33 minReplicas: 2 34 maxReplicas: 10 35 targetCPUUtilizationPercentage: 70 36 37 env: 38 LOG_LEVEL: info 39 APP_ENV: production 40 41 secrets: {} 42 # DATABASE_URL: "" # Set via --set or external-secrets 43 44 livenessProbe: 45 httpGet: 46 path: /healthz 47 port: 8080 48 initialDelaySeconds: 15 49 periodSeconds: 10 50 51 readinessProbe: 52 httpGet: 53 path: /ready 54 port: 8080 55 initialDelaySeconds: 5 56 periodSeconds: 5 57

1	# Default values for myapp Helm chart
2
3	replicaCount: 2
4
5	image:
6	repository: ghcr.io/myorg/myapp
7	tag: "" # Defaults to chart appVersion
8	pullPolicy: IfNotPresent
9
10	service:
11	type: ClusterIP
12	port: 80
13	targetPort: 8080
14
15	ingress:
16	enabled: true
17	className: nginx
18	host: myapp.example.com
19	tls:
20	enabled: true
21	secretName: myapp-tls
22
23	resources:
24	requests:
25	cpu: 100m
26	memory: 128Mi
27	limits:
28	cpu: 500m
29	memory: 512Mi
30
31	autoscaling:
32	enabled: false
33	minReplicas: 2
34	maxReplicas: 10
35	targetCPUUtilizationPercentage: 70
36
37	env:
38	LOG_LEVEL: info
39	APP_ENV: production
40
41	secrets: {}
42	# DATABASE_URL: "" # Set via --set or external-secrets
43
44	livenessProbe:
45	httpGet:
46	path: /healthz
47	port: 8080
48	initialDelaySeconds: 15
49	periodSeconds: 10
50
51	readinessProbe:
52	httpGet:
53	path: /ready
54	port: 8080
55	initialDelaySeconds: 5
56	periodSeconds: 5
57