Deploy with helm template

[jojozhuang]

Use helm with template

Use values.yaml

Edit the file in template folder, use Values variables and put the actual values in values.yaml.

appName: compare-helm
namespace: default

configmap:
  name: compare-configmap
  data:
    ENV_NAME: 'DEV'

image:
  name: jojozhuang/text-compare-angular
  tag: latest

Upgrade the deployment.

helm upgrade compare-helm deployment --values deployment/values.yaml
W0107 21:30:02.019806   39661 warnings.go:70] unknown field "spec.ports[0].type"
Release "compare-helm" has been upgraded. Happy Helming!
NAME: compare-helm
LAST DEPLOYED: Sun Jan  7 21:30:01 2024
NAMESPACE: default
STATUS: deployed
REVISION: 3
TEST SUITE: None

After each upgrade, the revision number should be incremented.

helm ls
NAME        	NAMESPACE	REVISION	UPDATED                             	STATUS  	CHART           	APP VERSION
compare-helm	default  	5       	2024-01-07 21:38:03.669554 -0800 PST	deployed	deployment-0.1.0	1.16.0

Add notes

Create file NOTES.txt under deployment/templates directory with the following content.

servicename=$(k get service -l "app={{ .Values.appName }}" -o jsonpath="{.items[0].metadata.name}")
kubectl --namespace {{ .Values.namespace}} port-forward service/{{ .Values.appName }} 8888:80

Each time when you run the upgrade command, you will see the notes in the output.

helm upgrade compare-helm deployment --values deployment/values.yaml
W0107 21:49:34.774115   40283 warnings.go:70] unknown field "spec.ports[0].type"
Release "compare-helm" has been upgraded. Happy Helming!
NAME: compare-helm
LAST DEPLOYED: Sun Jan  7 21:49:34 2024
NAMESPACE: default
STATUS: deployed
REVISION: 6
TEST SUITE: None
NOTES:
servicename=$(k get service -l "app=compare-helm" -o jsonpath="{.items[0].metadata.name}")
kubectl --namespace default port-forward service/compare-helm 8888:80

Copy and paste the two lines and execute them in teminal.

servicename=$(k get service -l "app=compare-helm" -o jsonpath="{.items[0].metadata.name}")
kubectl --namespace default port-forward service/compare-helm 8888:80

Then, you are able to access your site through http://localhost:8888/.

• How to Create Helm Charts - The Ultimate Guide
• https://github.com/devopsjourney1/helm-webapp/tree/main