solution

README.md

@@ -13,7 +13,92 @@ NOTE: The following tasks should take no more than 1 hour total.
 2. create docker-compose.yaml to replicate a full running environment 
 so that a developer can run the entire application locally without having
 to run any dependencies (i.e. redis) in a separate process.
-3. explain how you would monitor this application in production.  Please 
-write code to do the monitoring.
+3. Explain how you would monitor this application in production. Please write code/scripts to do the monitoring.
+
+
+### Kubernetes(MiniKube) Tasks
+1. Prepare local Kubernetes environment (using MiniKube) to run our application in pod/container. Store all relevant scripts (kubectl commands etc) in your forked repository.
+2. Suggest & create minimal local infrastructure to perform functional testing/monitoring of our application pod. Demonstrate monitoring of relevant results & metrics for normal app behavior and failure(s).
+
+
 
 Please fork this repository and make a pull request with your changes.
+
+Please provide test monitoring results in any convenient form (files, images, additional notes) as a separate archive.
+
+
+
+## Solution
+
+1. Dockerfile: ./src/Dockerfile
+2. For developer:
+```sh
+# To see the docker compose manifest
+cat docker-compose.yaml
+# Start
+docker compose up
+# Stop
+docker compose down
+```
+
+3. Application monitoring.
+Mostly depends on metrics what we want.
+I suggest:
+  - add functionality to write logs to the file
+  - mount disk
+  - run sidecar container with filebeat/metricbeat or fluentd and push logs to the some storage(e.g. InfluxDB)
+  - Grafana as UI. Grafana might be used from kube-prometheus-stack(see below)
+
+
+4. Kubernetes.
+I implemented configuration using Helm. Of course it might be only kubectl.
+Helm chart: ./k8s
+
+4.1 Create namespace for application
+
+```sh
+kubectl create namespace test-app
+```
+
+4.2 Deploy ingress-nginx(or similar) if you don't have any ingress controllers
+```sh
+cd ingress-nginx/
+helm install -n test-app ingress-nginx .
+```
+
+4.3 Deploy application
+```sh
+cd ./k8s/deploy/
+helm install -n test-app test-app .
+# if you have some changes:
+helm upgrade -n test-app test-app .
+```
+
+You can specify the images in values file: ./k8s/deploy/values.yaml
+
+5. k8s cluster monitoring
+
+5.1 Create monitoring namespace:
+```sh
+kubectl create namespace monitoring
+```
+
+5.2 Deploy kube-prometheus-stack
+By default it will deploy prometheus, alert manager, grafana.
+You could flexible customize the configuration and add some additional alerts in values file: ./k8s/kube-prometheus-stack/values.yaml
+
+```sh
+cd ./k8s/kube-prometheus-stack
+helm install -n monitoring monitoring .
+```
+
+6. Grafana
+There are a lot of pre-defined dashboards.
+
+For instance: http://localhost/grafana/d/6581e46e4e5c7ba40a07646395ef7b23/kubernetes-compute-resources-pod?orgId=1&refresh=10s&var-datasource=Prometheus&var-cluster=&var-namespace=test-app&var-pod=test-app-app-deployment-7ddd5f94fb-2b4j7&from=now-5m&to=now
+
+7. Routing
+"/" - application
+"/prometheous"
+"/grafana"
+

docker-compose.yaml

@@ -0,0 +1,13 @@
+services:
+  app:
+    build: src
+    ports:
+      - 8080:8080
+    depends_on:
+      - redis
+    environment:
+      - REDIS_ADDR=0.0.0.0:6379
+  redis:
+    image: redis
+    ports:
+       - 6379:6379

k8s/deploy/Chart.yaml

@@ -0,0 +1,3 @@
+name: "DevOps Test"
+owner: Petr Iglaev
+version: 1.0

k8s/deploy/templates/app-deployment.yaml

@@ -0,0 +1,22 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: {{ .Release.Name }}-app-deployment
+  labels:
+    app: {{ .Release.Name }}-app-deployment
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: {{ .Release.Name }}-app-deployment
+  template:
+    metadata:
+      labels:
+        app: {{ .Release.Name }}-app-deployment
+    spec:
+      containers:
+      - name: app
+        image: {{ .Values.app_container }}
+        imagePullPolicy: {{ .Values.app_pull_policy }}
+        ports:
+        - containerPort: 8080

k8s/deploy/templates/app-service.yaml

@@ -0,0 +1,11 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: service-app
+spec:
+  selector:
+    app: {{ .Release.Name }}-app-deployment
+  ports:
+    - protocol: TCP
+      port: 8080
+      targetPort: 8080

k8s/deploy/templates/ingress.yaml

@@ -0,0 +1,18 @@
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: ingress-app
+  annotations:
+    # nginx.ingress.kubernetes.io/rewrite-target: /$2
+    kubernetes.io/ingress.class: "nginx"
+spec:
+  rules:
+  - http:
+      paths:
+      - path: /
+        pathType: Prefix
+        backend:
+          service:
+            name: service-app
+            port:
+              number: 8080

k8s/deploy/templates/redis-deployment.yaml

@@ -0,0 +1,22 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: {{ .Release.Name }}-redis-deployment
+  labels:
+    app: {{ .Release.Name }}-redis-deployment
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: {{ .Release.Name }}-redis-deployment
+  template:
+    metadata:
+      labels:
+        app: {{ .Release.Name }}-redis-deployment
+    spec:
+      containers:
+      - name: redis
+        image: {{ .Values.redis_container }}
+        imagePullPolicy: IfNotPresent
+        ports:
+        - containerPort: 6379

k8s/deploy/templates/redis-service.yaml

@@ -0,0 +1,11 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: service-redis
+spec:
+  selector:
+    app: {{ .Release.Name }}-redis-deployment
+  ports:
+    - protocol: TCP
+      port: 6379
+      targetPort: 6379

k8s/deploy/values.yaml

@@ -0,0 +1,8 @@
+# Application
+app_container: devopstest:2.0
+# Set IfNotPresent if you image is remote
+app_pull_policy: Never
+
+
+# Redis
+redis_container: redis:latest

k8s/ingress-nginx/.helmignore

@@ -0,0 +1,22 @@
+# Patterns to ignore when building packages.
+# This supports shell glob matching, relative path matching, and
+# negation (prefixed with !). Only one pattern per line.
+.DS_Store
+# Common VCS dirs
+.git/
+.gitignore
+.bzr/
+.bzrignore
+.hg/
+.hgignore
+.svn/
+# Common backup files
+*.swp
+*.bak
+*.tmp
+*~
+# Various IDEs
+.project
+.idea/
+*.tmproj
+.vscode/