Initial commit of deployable backend repo

Author: bmonkman

Dockerfile

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+FROM golang:1.13.7-alpine3.11 as builder
+WORKDIR /app
+COPY . .
+RUN go build -o <% .Name %> main.go
+
+FROM alpine:3.11
+RUN apk add --update bash ca-certificates
+WORKDIR /app
+COPY --from=builder /app/<% .Name %> .
+
+ENTRYPOINT ["/app/<% .Name %>"]

Makefile

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+build:
+	go build -o <% .Name %> main.go
+
+run:
+	SERVER_PORT=80 go run main.go

example.yml

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+---
+name: example-app
+
+# params are key value pairs passed into templates
+params:
+
+  # production host name
+  productionHost: fix_me
+
+  # staging host name
+  stagingHost: fix_me
+
+  # production database hostname
+  productionDatabaseHostname: fix_me
+
+  # staging database hostname
+  stagingDatabaseHostname: fix_me

kubernetes/base/deployment.yml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: <% .Name %>
+spec:
+  revisionHistoryLimit: 5
+  selector:
+    matchLabels:
+      app: <% .Name %>
+  template:
+    spec:
+      containers:
+        - name: <% .Name %>
+          image: fake-image
+          resources:
+            requests:
+              memory: 64Mi
+              cpu: 0.1
+            limits:
+              memory: 256Mi
+              cpu: 0.5
+          livenessProbe:
+            exec:
+              command:
+              - rm
+              - /tmp/service-alive
+            initialDelaySeconds: 5
+            periodSeconds: 5
+          readinessProbe:
+            httpGet:
+              port: http
+              path: /status/ready
+            initialDelaySeconds: 5
+            periodSeconds: 10
+            timeoutSeconds: 2
+          envFrom:
+          - configMapRef:
+              name: <% .Name %>-config
+          env:
+          - name: DATABASE_USERNAME
+            valueFrom:
+                secretKeyRef:
+                  name: <% .Name %>
+                  key: DATABASE_USERNAME
+          - name: DATABASE_PASSWORD
+            valueFrom:
+                secretKeyRef:
+                  name: <% .Name %>
+                  key: DATABASE_PASSWORD
+---
+apiVersion: autoscaling/v1
+kind: HorizontalPodAutoscaler
+metadata:
+  name: <% .Name %>
+spec:
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: <% .Name %>
+  maxReplicas: 2
+  minReplicas: 1
+  targetCPUUtilizationPercentage: 60

kubernetes/base/kustomization.yml

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+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+- deployment.yml
+- service.yml
+
+configMapGenerator:
+- name: <% .Name %>-config
+  literals:
+    - SERVICE_PORT=80
+    - DATABASE_HOST=localhost
+    - DATABASE_PORT=5432
+
+commonLabels:
+  app: <% .Name %>

kubernetes/base/service.yml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: <% .Name %>
+spec:
+  ports:
+  - name: http
+    protocol: TCP
+    port: 80
+    targetPort: 80
+  selector:
+    app: <% .Name %>

kubernetes/production/deployment.yml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: <% .Name %>
+spec:
+  template:
+    spec:
+      containers:
+        - name: <% .Name %>
+          resources:
+            requests:
+              memory: 128Mi
+              cpu: 0.5
+            limits:
+              memory: 512Mi
+              cpu: 1.0
+---
+apiVersion: autoscaling/v1
+kind: HorizontalPodAutoscaler
+metadata:
+  name: <% .Name %>
+spec:
+  maxReplicas: 4
+  minReplicas: 2

kubernetes/production/ingress.yml

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+apiVersion: extensions/v1beta1
+kind: Ingress
+metadata:
+  name: <% .Name %>
+  annotations:
+    # nginx ingress
+    kubernetes.io/ingress.class: nginx
+    nginx.ingress.kubernetes.io/rewrite-target: /$1
+    # cert-manager
+    ingress.kubernetes.io/ssl-redirect: "true"
+    cert-manager.io/cluster-issuer: clusterissuer-letsencrypt-production
+    # external-dns
+    external-dns.alpha.kubernetes.io/hostname: <% index .Params `productionHost` %>
+
+spec:
+  rules:
+  - host: <% index .Params `productionHost` %>
+    http:
+      paths:
+        - path: /(.*)
+          backend:
+            serviceName: <% .Name %>
+            servicePort: http
+  tls:
+  - hosts:
+    - <% index .Params `productionHost` %>
+    secretName: <% .Name %>-tls-secret

kubernetes/production/kustomization.yml

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+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+bases:
+- ../base
+
+patchesStrategicMerge:
+- deployment.yml
+
+resources:
+- ingress.yaml
+- pdb.yaml
+
+configMapGenerator:
+- name: <% .Name %>-config
+  behavior: merge
+  literals:
+    - DATABASE_HOST=<% index .Params `productionDatabaseHostname` %>
+    - DATABASE_NAME=<% .Name %>_production
+    - ENVIRONMENT=production

kubernetes/production/pdb.yaml

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+---
+apiVersion: policy/v1beta1
+kind: PodDisruptionBudget
+metadata:
+  name: <% .Name %>
+spec:
+  minAvailable: 2
+  selector:
+    matchLabels:
+      service: <% .Name %>