initium/examples/config-render/deployment.yaml at main · KitStream/initium · GitHub

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# Config render example
#
# This example shows a deployment that renders a config template
# using environment variables before starting the main container.
#
# Usage:
#   kubectl apply -f examples/config-render/
apiVersion: v1
kind: ConfigMap
metadata:
  name: app-template
data:
  app.conf.tmpl: |
    server {
      listen {{ .PORT | default "8080" }};
      database_host {{ .DB_HOST }};
      database_port {{ .DB_PORT }};
      log_level {{ .LOG_LEVEL | default "info" }};
    }
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: app-with-config
  labels:
    app: app-with-config
spec:
  replicas: 1
  selector:
    matchLabels:
      app: app-with-config
  template:
    metadata:
      labels:
        app: app-with-config
    spec:
      initContainers:
        - name: render-config
          image: ghcr.io/kitstream/initium:latest
          args:
            - render
            - --template
            - /templates/app.conf.tmpl
            - --output
            - config/app.conf
            - --workdir
            - /work
          env:
            - name: DB_HOST
              value: postgres
            - name: DB_PORT
              value: "5432"
            - name: PORT
              value: "9090"
            - name: LOG_LEVEL
              value: debug
          securityContext:
            runAsNonRoot: true
            runAsUser: 65534
            readOnlyRootFilesystem: true
            allowPrivilegeEscalation: false
            capabilities:
              drop:
                - ALL
          volumeMounts:
            - name: workdir
              mountPath: /work
            - name: templates
              mountPath: /templates
              readOnly: true

      containers:
        - name: app
          image: myapp:latest
          ports:
            - containerPort: 9090
          volumeMounts:
            - name: workdir
              mountPath: /work
              readOnly: true

      volumes:
        - name: workdir
          emptyDir: {}
        - name: templates
          configMap:
            name: app-template