Add secret that holds password for various accounts.
Default Camunda user account: demo
Default Keycloak user account: admin

kubectl apply -f identity-secret.yaml --namespace $UNAMESPACE
                

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After this, you should see secret created in your namespace (via Project Lens UI app).
# Config => secret/identity-secret created

Used for TLS and associated configuration.

UNAMESPACE=$UNAMESPACE envsubst < zeebe-makefile | sh
                

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Helm install camunda-platform

helm repo add camunda https://helm.camunda.io
helm repo update
UNAMESPACE=$UNAMESPACE envsubst < values-combined-ingress.yaml > values-combined-ingress.my-ns.yaml
UNAMESPACE=$UNAMESPACE envsubst < values-connectors-env.yaml   > values-connectors-env.my-ns.yaml
helm install $UNAMESPACE camunda/camunda-platform \
  -f values-combined-ingress.my-ns.yaml \
  -f values-connectors-env.my-ns.yaml \
  --set zeebe.prometheusServiceMonitor.enabled=true \
  --version 12.4.0 --namespace $UNAMESPACE
                

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This step may take a while as it installs about a handful of pods.
You may watch the logs associated with pods to see the progress.

Add ingress to enable traffic flow to the deployed services.

envsubst '${UNAMESPACE}' < c8-ingress-keycloak.yaml  | kubectl apply  -f -
envsubst '${UNAMESPACE}' < c8-ingress.yaml           | kubectl apply  -f -
envsubst '${UNAMESPACE}' < c8-zeebe-ingress.yaml     | kubectl apply  -f -

                

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You may check the ingress definition in the assigned namespace.