Lab14 Complete

k8s/ROLLOUTS.md

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+## Argo Rollouts Setup
+### Installation verification
+```bash
+kubectl argo rollouts version
+```
+```text
+kubectl-argo-rollouts: v1.9.0+838d4e7
+  BuildDate: 2026-03-20T21:08:11Z
+  GitCommit: 838d4e792be666ec11bd0c80331e0c5511b5010e
+  GitTreeState: clean
+  GoVersion: go1.24.13
+  Compiler: gc
+  Platform: linux/amd64
+```
+
+### Dashboard access
+![Dashboard](/k8s/screenshots/argo_rollout_dashboard.png)
+
+## Canary Deployment
+### Strategy configuration explained
+The strategy gradually increases the weight of the new version (ratio). If I notice some issue, I have the chance to
+abort the rollout.
+
+### Step-by-step rollout progression (screenshots from dashboard)
+![Steps](/k8s/screenshots/argo_rollout_steps.png)
+
+Changed the tag to latest, paused at weight 20:
+
+![20](/k8s/screenshots/argo_rollout_pause_20.png)
+
+### Promotion and abort demonstration
+
+Pressed abort:
+
+![Abort](/k8s/screenshots/argo_rollout_aborted.png)
+
+Pressing "Promote" would just eventually replace all pods with the "latest" pods.
+
+## Blue-Green Deployment
+### Strategy configuration explained
+I added a new service with the "-preview" suffix (`roll-dinfochart-preview`). The strategy reflects that.
+
+### Preview vs active service
+They are identical in my configuration, but all are working.
+
+### Promotion process
+```bash
+kubectl argo rollouts promote roll-dinfochart
+```
+```text
+rollout 'roll-dinfochart' promoted
+```
+
+## Strategy Comparison
+### When to use canary vs blue-green
+Canary is useful when there are no resources to host twice as many containers, or it is fine to test the new version on
+a subset of users in production.
+
+Blue-green is useful when we need to launch a new version (tested) and switch the service to the new one with no
+downtime because it immediately re-routes traffic to the new version.

k8s/dinfochart/templates/rollout.yaml

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+apiVersion: argoproj.io/v1alpha1
+kind: Rollout
+metadata:
+  name: {{ include "dinfochart.fullname" . }}
+spec:
+  replicas: {{ .Values.replicaCount }}
+  selector:
+    matchLabels:
+      {{- include "dinfochart.selectorLabels" . | nindent 6 }}
+  template:
+    metadata:
+      labels:
+        {{- include "dinfochart.labels" . | nindent 8 }}
+        {{- with .Values.podLabels }}
+        {{- toYaml . | nindent 8 }}
+        {{- end }}
+      annotations:
+        vault.hashicorp.com/agent-inject: "true"
+        vault.hashicorp.com/role: "dinfoservice-role"
+        vault.hashicorp.com/agent-inject-secret-config: "secret/data/myapp/config"
+    spec:
+      containers:
+        - name: {{ .Chart.Name }}
+          image:  "{{ .Values.image.repository }}:{{ .Values.image.tag | default .Chart.AppVersion }}"
+          ports:
+          - containerPort: {{ .Values.service.port }}
+          {{- with .Values.resources }}
+          resources:
+            {{- toYaml . | nindent 12 }}
+          {{- end }}
+          {{- with .Values.livenessProbe }}
+          livenessProbe:
+            {{- toYaml . | nindent 12 }}
+          {{- end }}
+          {{- with .Values.readinessProbe }}
+          readinessProbe:
+            {{- toYaml . | nindent 12 }}
+          {{- end }}
+          volumeMounts:
+            - name: app-config
+              mountPath: /config
+              readOnly: true
+            - name: data-volume
+              mountPath: /data
+          envFrom:
+            - configMapRef:
+                name: {{ include "dinfochart.fullname" . }}-env
+      volumes:
+        - name: app-config
+          configMap:
+            name: {{ include "dinfochart.fullname" . }}-config
+        - name: data-volume
+          persistentVolumeClaim:
+            claimName: {{ include "dinfochart.fullname" . }}-data
+  strategy:
+    blueGreen:
+      activeService: {{ include "dinfochart.fullname" . }}
+      previewService: {{ include "dinfochart.fullname" . }}-preview
+      autoPromotionEnabled: false  # Manual promotion
+      # autoPromotionSeconds: 30  # Or auto-promote after 30s

k8s/dinfochart/templates/service-preview.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ include "dinfochart.fullname" . }}-preview
+  labels:
+    {{- include "dinfochart.labels" . | nindent 4 }}
+spec:
+  type: NodePort
+  selector:
+    {{- include "dinfochart.selectorLabels" . | nindent 4 }}
+  ports:
+    - protocol: TCP
+      port: {{ .Values.service.port }}
+      targetPort: {{ .Values.service.targetPort }}