docs(lab4): add lab4 — K8s manifests and deployment

k8s/chart/Chart.yaml

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+apiVersion: v2
+name: quickticket
+description: QuickTicket SRE learning project
+version: 0.1.0

k8s/chart/templates/events.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: events
+spec:
+  replicas: {{ .Values.events.replicas }}
+  selector:
+    matchLabels:
+      app: events
+  template:
+    metadata:
+      labels:
+        app: events
+    spec:
+      containers:
+        - name: events
+          image: {{ .Values.events.image }}
+          imagePullPolicy: Never
+          ports:
+            - containerPort: 8081
+          env:
+            - name: DB_HOST
+              value: "{{ .Values.events.db.host}}"
+            - name: DB_PORT
+              value: "{{ .Values.events.db.port }}"
+            - name: DB_NAME
+              value: "{{ .Values.events.db.name }}"
+            - name: DB_USER
+              value: "{{ .Values.events.db.user }}"
+            - name: DB_PASS
+              value: "{{ .Values.events.db.password }}"
+            - name: REDIS_HOST
+              value: "redis"
+            - name: REDIS_PORT
+              value: "6379"
+          livenessProbe:
+            httpGet:
+              path: /health
+              port: 8081
+            initialDelaySeconds: 10
+            periodSeconds: 10
+            failureThreshold: 3
+          readinessProbe:
+            httpGet:
+              path: /health
+              port: 8081
+            periodSeconds: 5
+            failureThreshold: 2
+          resources:
+            {{- toYaml .Values.resources | nindent 12 }}
+
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: events
+spec:
+  type: ClusterIP
+  selector:
+    app: events
+  ports:
+    - port: 8081
+      targetPort: 8081

k8s/chart/templates/gateway.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: gateway
+spec:
+  replicas: {{ .Values.gateway.replicas }}
+  selector:
+    matchLabels:
+      app: gateway
+  template:
+    metadata:
+      labels:
+        app: gateway
+    spec:
+      containers:
+        - name: gateway
+          image: {{ .Values.gateway.image }}
+          imagePullPolicy: Never
+          ports:
+            - containerPort: 8080
+          env:
+            - name: EVENTS_URL
+              value: "http://events:8081"
+            - name: PAYMENTS_URL
+              value: "http://payments:8082"
+            - name: GATEWAY_TIMEOUT_MS
+              value: "5000"
+          livenessProbe:
+            httpGet:
+              path: /health
+              port: 8080
+            initialDelaySeconds: 10
+            periodSeconds: 10
+            failureThreshold: 3
+          readinessProbe:
+            httpGet:
+              path: /health
+              port: 8080
+            periodSeconds: 5
+            failureThreshold: 2
+          resources:
+            {{- toYaml .Values.resources | nindent 12 }}
+
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: gateway
+spec:
+  type: ClusterIP
+  selector:
+    app: gateway
+  ports:
+    - port: 8080
+      targetPort: 8080

k8s/chart/templates/payments.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: payments
+spec:
+  replicas: {{ .Values.payments.replicas }}
+  selector:
+    matchLabels:
+      app: payments
+  template:
+    metadata:
+      labels:
+        app: payments
+    spec:
+      containers:
+        - name: payments
+          image: {{ .Values.payments.image }}
+          imagePullPolicy: Never
+          ports:
+            - containerPort: 8082
+          env:
+            - name: PAYMENT_FAILURE_RATE
+              value: "{{ .Values.payments.failureRate }}"
+            - name: PAYMENT_LATENCY_MS
+              value: "{{ .Values.payments.latencyMs }}"
+          livenessProbe:
+            httpGet:
+              path: /health
+              port: 8082
+            initialDelaySeconds: 10
+            periodSeconds: 10
+            failureThreshold: 3
+          readinessProbe:
+            httpGet:
+              path: /health
+              port: 8082
+            periodSeconds: 5
+            failureThreshold: 2
+          resources:
+            {{- toYaml .Values.resources | nindent 12 }}
+
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: payments
+spec:
+  type: ClusterIP
+  selector:
+    app: payments
+  ports:
+    - port: 8082
+      targetPort: 8082

k8s/chart/templates/postgres.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: postgres
+spec:
+  replicas: {{ .Values.postgres.replicas }}
+  selector:
+    matchLabels:
+      app: postgres
+  template:
+    metadata:
+      labels:
+        app: postgres
+    spec:
+      containers:
+        - name: postgres
+          image: {{ .Values.postgres.image }}
+          ports:
+            - containerPort: 5432
+          env:
+            - name: POSTGRES_DB
+              value: "{{ .Values.postgres.db.name }}"
+            - name: POSTGRES_USER
+              value: "{{ .Values.postgres.db.user }}"
+            - name: POSTGRES_PASSWORD
+              value: "{{ .Values.postgres.db.password }}"
+          resources:
+            {{- toYaml .Values.resources | nindent 12 }}
+
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: postgres
+spec:
+  type: ClusterIP
+  selector:
+    app: postgres
+  ports:
+    - port: 5432
+      targetPort: 5432

k8s/chart/templates/redis.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: redis
+spec:
+  replicas: {{ .Values.redis.replicas}}
+  selector:
+    matchLabels:
+      app: redis
+  template:
+    metadata:
+      labels:
+        app: redis
+    spec:
+      containers:
+        - name: redis
+          image: {{ .Values.redis.image }}
+          ports:
+            - containerPort: 6379
+          resources:
+            {{- toYaml .Values.resources | nindent 12 }}
+
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: redis
+spec:
+  type: ClusterIP
+  selector:
+    app: redis
+  ports:
+    - port: 6379
+      targetPort: 6379

k8s/chart/values.yaml

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+gateway:
+  replicas: 1
+  image: quickticket-gateway:v1
+
+events:
+  replicas: 1
+  image: quickticket-events:v1
+  db:
+    host: postgres
+    port: 5432
+    name: quickticket
+    user: quickticket
+    password: quickticket
+
+payments:
+  replicas: 1
+  image: quickticket-payments:v1
+  failureRate: "0.0"
+  latencyMs: "0"
+
+postgres:
+  replicas: 1
+  image: postgres:17-alpine
+  db:
+    name: quickticket
+    user: quickticket
+    password: quickticket
+
+redis:
+  replicas: 1
+  image: redis:7-alpine
+
+resources:
+  requests:
+    cpu: 50m
+    memory: 64Mi
+  limits:
+    cpu: 200m
+    memory: 256Mi

k8s/events.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: events
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: events
+  template:
+    metadata:
+      labels:
+        app: events
+    spec:
+      containers:
+        - name: events
+          image: quickticket-events:v1
+          imagePullPolicy: Never
+          ports:
+            - containerPort: 8081
+          env:
+            - name: DB_HOST
+              value: "postgres"
+            - name: DB_PORT
+              value: "5432"
+            - name: DB_NAME
+              value: "quickticket"
+            - name: DB_USER
+              value: "quickticket"
+            - name: DB_PASS
+              value: "quickticket"
+            - name: REDIS_HOST
+              value: "redis"
+            - name: REDIS_PORT
+              value: "6379"
+          livenessProbe:
+            httpGet:
+              path: /health
+              port: 8081
+            initialDelaySeconds: 10
+            periodSeconds: 10
+            failureThreshold: 3
+          readinessProbe:
+            httpGet:
+              path: /health
+              port: 8081
+            periodSeconds: 5
+            failureThreshold: 2
+          resources:
+            requests:
+              cpu: 50m
+              memory: 64Mi
+            limits:
+              cpu: 200m
+              memory: 256Mi
+
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: events
+spec:
+  type: ClusterIP
+  selector:
+    app: events
+  ports:
+    - port: 8081
+      targetPort: 8081