DRY

Don't Repeat Yourself

The key to using Helm charts rather than simply authoring Kubernetes YAML definitions is the use of templates. This way a deployment pattern can be defined once, with only the deploy time, application specific, values being changed.

From the Helm template the health probes are hard coded, replace these with shared definitions, .Values.service.port & .Values.service.probeContext.

deployment.yaml

      containers:
        - name: {{ .Chart.Name }}
          securityContext:
            {{- toYaml .Values.securityContext | nindent 12 }}
          image: "{{ .Values.image.repository }}:{{ .Values.image.tag | default .Chart.AppVersion }}"
          imagePullPolicy: {{ .Values.image.pullPolicy }}
          ports:
            - name: http
              containerPort: {{ .Values.service.port }}
              protocol: TCP
          livenessProbe:
            httpGet:
              path: {{ .Values.service.probeContext }}
              port: {{ .Values.service.port }}
          readinessProbe:
            httpGet:
              path: {{ .Values.service.probeContext }}
              port: {{ .Values.service.port }}
          resources:
            {{- toYaml .Values.resources | nindent 12 }}

The .Values.service.port is already defined in the generated values file, but .Values.service.probeContext is not, so add this to the values definition.

values.yaml

service:
  type: ClusterIP
  port: 8000
  probeContext: /

Now replace single values file with a file for each application being deployed based on this pattern. Create additional app definitions in Helmsman

ranger.yaml

apps:
  kestrel:
    name: "kestrel"
    description: "dotnet core Kestrel API"
    namespace: "name_space"
    enabled: true
    chart: "public-ingress-0.1.3.tgz"
    version: "0.1.3"
    valuesFile: "dockerhub-public/kestrel.yaml"

  fastapi:
    name: "fastapi"
    description: "Python Fast API"
    namespace: "name_space"
    enabled: true
    chart: "public-ingress-0.1.1.tgz"
    version: "0.1.1"
    valuesFile: "dockerhub-public/fastapi.yaml"