Create a basic container image and helm chart

Author: mhill-holoplot

Dockerfile

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+FROM golang:1.23-alpine AS builder
+
+WORKDIR /usr/src/app
+
+COPY go.mod go.sum ./
+RUN go mod download && go mod verify
+
+COPY . .
+RUN go build -v -o /usr/local/bin/octo ./cmd/octo
+
+FROM scratch
+
+COPY --from=builder /usr/local/bin/octo /usr/local/bin/octo
+
+CMD ["/usr/local/bin/octo"]

charts/octo/Chart.yaml

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+apiVersion: v1
+name: octo
+description: octo-proxy is a simple TCP/TLS proxy with mTLS
+version: 1.0.0
+appVersion: 1.1.0

charts/octo/templates/configmap.yaml

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+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: {{ .Release.Name }}
+data:
+  config.yaml: {{ toYaml .Values.config | indent 2 }}

charts/octo/templates/deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: {{ .Release.Name }}
+  labels:
+    app: {{ .Release.Name }}
+spec:
+  replicas: {{ .Values.replicas }}
+  selector:
+    matchLabels:
+      app: {{ .Release.Name }}
+  template:
+    metadata:
+      labels:
+        app: {{ .Release.Name }}
+    spec:
+      containers:
+      - name: octo
+        image: {{ .Values.image.repository }}:{{ .Values.image.tag }}
+        imagePullPolicy: {{ .Values.image.pullPolicy }}
+        volumeMounts:
+        - name: octo-config
+          mountPath: /etc/octo
+          readOnly: true
+        command: ["/usr/local/bin/octo", "-config", "/etc/octo/config.yaml"]
+        resources:
+          {{ toYaml .Values.resources | nindent 10 }}
+      volumes:
+        - name: octo-config
+          configMap:
+            name: {{ .Release.Name }}

charts/octo/templates/service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ .Release.Name }}
+spec:
+  type: ClusterIP
+  selector:
+    app: {{ .Release.Name }}
+  ports:
+    {{- range .Values.ports }}
+    - port: {{ .port }}
+      targetPort: {{ .targetPort }}
+      protocol: {{ .protocol }}
+      name: {{ .name }}
+    {{- end }} 

charts/octo/values.yaml

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+image:
+  repository: octo
+  tag: 1.1.0
+  pullPolicy: IfNotPresent
+
+ports:
+  - name: http
+    port: 80
+    targetPort: 8080
+
+replicas: 1
+
+resources:
+  requests:
+    memory: "64Mi"
+    cpu: "250m"
+  limits:
+    memory: "128Mi"
+    cpu: "500m"
+
+config: |
+  servers:
+  - name: web-proxy
+    listener:
+      host: 127.0.0.1
+      port: 8080
+    targets:
+      - host: 127.0.0.1
+        port: 80