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Prerequisites

  • Visual Studio Code / vim,
  • Git cli,
  • GitHub,
  • DockerHub,
  • Nest.js cli,
  • Docker Desktop,
  • Kubernetes (minikube),
  • Chrome / curl,
  • Prometheus.

Part 1

Write a node.js application which displays in http on / "hello world".

1. Installation

$ mkdir -p ~/workspace/prestashop
$ cd ~/workspace/prestashop
$ nest new test-node

-Replace string by hello world in method getHello of AppService

2. Test with Jest

$ npm run test
PASS  src/app.controller.spec.ts
  AppController
    root
      ✓ should return "hello world" (35ms)

  console.log src/app.service.ts:6
    hello world

Test Suites: 1 passed, 1 total
Tests:       1 passed, 1 total
Snapshots:   0 total
Time:        3.604s
Ran all test suites.

3. Run application

$ cd test-node && npm start
$ curl -w '\n' localhost:3000
hello world

4. Save code in Github

$ git init
$ git add .
$ git commit -m "exercice 1"
$ git remote add origin https://github.com/vleclerc/test-node-prestashop.git
$ git push -u origin master

Part 2 :

Run it on a container Docker.

1. Make the Dockerfile

$ touch Dockerfile

2. Check last version LTS of nodejs ex: 12.16.1

3. Ignore useless files to build our Docker image

$ touch .dockerignore

4. Build an image of our application

$ docker build -t vleclerc/test-node-prestashop:0.0.1 .

5. Show images

$ docker images

Result:

REPOSITORY                           TAG                 IMAGE ID            CREATED             SIZE
vleclerc/test-node-prestashop        0.0.1               45752af18474        13 seconds ago      344MB
node                                 12.16.1-slim        26932a190e66        3 weeks ago         140MB
...

6. Run a container of our application with this image

$ docker run --name test-node-prestashop --rm -p 8080:3000 -d vleclerc/test-node-prestashop:0.0.1

7. Show containers

$ docker ps

Result:

CONTAINER ID        IMAGE                                 COMMAND                  CREATED             STATUS              PORTS                              NAMES
a032f056de60        vleclerc/test-node-prestashop:0.0.1   "docker-entrypoint.s…"   3 seconds ago       Up 2 seconds        8080/tcp, 0.0.0.0:8080->3000/tcp   test-node-prestashop

8. Follow application logs in the container In a new terminal:

$ docker logs -f test-node-prestashop

Result:

> test-node@0.0.1 start /usr/src/app
> nest start

[Nest] 30   - 03/16/2020, 12:39:25 PM   [NestFactory] Starting Nest application...
[Nest] 30   - 03/16/2020, 12:39:25 PM   [InstanceLoader] AppModule dependencies initialized +36ms
[Nest] 30   - 03/16/2020, 12:39:25 PM   [RoutesResolver] AppController {/}: +12ms
[Nest] 30   - 03/16/2020, 12:39:25 PM   [RouterExplorer] Mapped {/, GET} route +8ms
[Nest] 30   - 03/16/2020, 12:39:25 PM   [NestApplication] Nest application successfully started +5ms

9. Test our container application

$ curl -w '\n' localhost:8080

Result:

hello world

Logs:

hello world

10. Stop the container

$ docker stop test-node-prestashop

Part 3 :

Updates the application to display : "hello PrestaShop"

1. Update code

-Replace string world by PrestaShop in method getHello of AppService

2. Test with Jest

$ npm run test
FAIL  src/app.controller.spec.ts
  AppController
    root
      ✕ should return "hello world" (36ms)

  ● AppController › root › should return "hello world"

    expect(received).toBe(expected) // Object.is equality

    Expected: "hello world"
    Received: "hello PrestaShop"

      17 |   describe('root', () => {
      18 |     it('should return "hello world"', () => {
    > 19 |       expect(appController.getHello()).toBe('hello world');
         |                                        ^
      20 |     });
      21 |   });
      22 | });

      at Object.<anonymous> (app.controller.spec.ts:19:40)

  console.log src/app.service.ts:6
    hello PrestaShop

3. Update Test

Replace string world by PrestaShop in file app.controller.spec.ts

4. Run test again

$ npm run test
PASS  src/app.controller.spec.ts
  AppController
    root
      ✓ should return "hello PrestaShop" (30ms)

  console.log src/app.service.ts:6
    hello PrestaShop

Test Suites: 1 passed, 1 total
Tests:       1 passed, 1 total
Snapshots:   0 total
Time:        3.692s
Ran all test suites.

5. Build a new image version of our application

$ docker build -t vleclerc/test-node-prestashop:0.0.2 .

6. Show images

$ docker images

Result:

REPOSITORY                           TAG                 IMAGE ID            CREATED             SIZE
vleclerc/test-node-prestashop        0.0.2               f64abb651979        10 seconds ago      344MB
vleclerc/test-node-prestashop        0.0.1               45752af18474        2 days ago          344MB
node                                 12.16.1-slim        26932a190e66        3 weeks ago         140MB
...

7. Run a container of our application with this image

$ docker stop test-node-prestashop
$ docker run --name test-node-prestashop --rm -p 8080:3000 -d vleclerc/test-node-prestashop:0.0.2

8. Show containers

$ docker ps

Result:

CONTAINER ID        IMAGE                                 COMMAND                  CREATED             STATUS              PORTS                              NAMES
672de4d069e4        vleclerc/test-node-prestashop:0.0.2   "docker-entrypoint.s…"   15 seconds ago      Up 14 seconds       8080/tcp, 0.0.0.0:8080->3000/tcp   test-node-prestashop

9. Follow application logs in the container In a new terminal:

$ docker logs -f test-node-prestashop

Result:

> test-node@0.0.1 start /usr/src/app
> nest start

[Nest] 30   - 03/16/2020, 12:39:25 PM   [NestFactory] Starting Nest application...
[Nest] 30   - 03/16/2020, 12:39:25 PM   [InstanceLoader] AppModule dependencies initialized +36ms
[Nest] 30   - 03/16/2020, 12:39:25 PM   [RoutesResolver] AppController {/}: +12ms
[Nest] 30   - 03/16/2020, 12:39:25 PM   [RouterExplorer] Mapped {/, GET} route +8ms
[Nest] 30   - 03/16/2020, 12:39:25 PM   [NestApplication] Nest application successfully started +5ms

10. Test our container application

$ curl -w '\n' localhost:8080

Result:

hello PrestaShop

Logs:

hello PrestaShop

10. Stop the container

$ docker stop test-node-prestashop

11. Save local images in DockerHub

$ docker tag vleclerc/test-node-prestashop:0.0.1 vleclercdev/test-node-prestashop:0.0.1
$ docker push vleclercdev/test-node-prestashop:0.0.1
$ docker tag vleclerc/test-node-prestashop:0.0.2 vleclercdev/test-node-prestashop:0.0.2
$ docker push vleclercdev/test-node-prestashop:0.0.2

Part 4 :

1. Start minikube to deploy containers

$ minikube start
$ kubectl cluster-info
Kubernetes master is running at https://192.168.64.3:8443
KubeDNS is running at https://192.168.64.3:8443/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy

2. Start Kubernetes Dashboard cf. https://github.com/vleclerc/k8s-dashboard

3. Configure and Start Prometheus cf. https://github.com/vleclerc/prometheus

4. Add monitoring, liveness and readness endpoints on your app

$ npm i prometheus-api-metrics && npm prom-client
$ npm i @cloudnative/health-connect

Add global middleware in main.ts and test metrics endpoint.

$ npm start

Test endpoints in your favorite browser: http://localhost:3000/metrics http://localhost:3000/live http://localhost:3000/ready http://localhost:3000/health

5. Recreate tag and push test-node-prestashop:0.0.1 and 0.0.2 with endpoints

$ docker rmi vleclerc/test-node-prestashop:0.0.1
$ docker build -t vleclerc/test-node-prestashop:0.0.1 .
$ docker tag vleclerc/test-node-prestashop:0.0.1 vleclercdev/test-node-prestashop:0.0.1
$ docker push vleclercdev/test-node-prestashop:0.0.1
$
$ docker rmi vleclerc/test-node-prestashop:0.0.2
$ docker build -t vleclerc/test-node-prestashop:0.0.2 .
$ docker tag vleclerc/test-node-prestashop:0.0.2 vleclercdev/test-node-prestashop:0.0.2
$ docker push vleclercdev/test-node-prestashop:0.0.2

6. Make a deployment of the test-node-prestashop:0.0.1 (stable) In a kube directory create app-deployment.yml Reference dockerhub image vleclercdev/test-node-prestashop:0.0.1 Configure number of replica and blue/green deployment strategy partial ex:

...
  replicas: 3
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 0
...
$ kubectl apply -f kube

7. Prometheus Graph update Prometheus target with cluste_rip:service_port

get cluster ip

$ kubectl cluster-info

get service port

$ kubectl describe service app-lb

go to http://localhost:9090/graph Filter by up expression Look at the graph when you deploy there is no downtime.

8. Make a deployment of 25% the test-node-prestashop:0.0.2 (canary strategy) There is 3 replicas on stable version if you deploy 1 replica on carany the total of replicas is 4 stable app : 3/4 = 75% canary app : 1/4 = 25%

$ kubectl apply -f kubectl apply -f kube/app-deployment-canary.yaml

9. Test deployment of canary app

On 30 calls we have 7 HelloPrestaShop 7*100/30=23.333... approximatly 25%

➜  test-node git:(master) ✗ curl -w '\n' http://192.168.64.3:31534/
hello world
➜  test-node git:(master) ✗ curl -w '\n' http://192.168.64.3:31534/
hello PrestaShop
➜  test-node git:(master) ✗ curl -w '\n' http://192.168.64.3:31534/
hello world
➜  test-node git:(master) ✗ curl -w '\n' http://192.168.64.3:31534/
hello world
➜  test-node git:(master) ✗ curl -w '\n' http://192.168.64.3:31534/
hello world
➜  test-node git:(master) ✗ curl -w '\n' http://192.168.64.3:31534/
hello world
➜  test-node git:(master) ✗ curl -w '\n' http://192.168.64.3:31534/
hello world
➜  test-node git:(master) ✗ curl -w '\n' http://192.168.64.3:31534/
hello PrestaShop
➜  test-node git:(master) ✗ curl -w '\n' http://192.168.64.3:31534/
hello world
➜  test-node git:(master) ✗ curl -w '\n' http://192.168.64.3:31534/
hello world
➜  test-node git:(master) ✗ curl -w '\n' http://192.168.64.3:31534/
hello world
➜  test-node git:(master) ✗ curl -w '\n' http://192.168.64.3:31534/
hello PrestaShop
➜  test-node git:(master) ✗ curl -w '\n' http://192.168.64.3:31534/
hello world
➜  test-node git:(master) ✗ curl -w '\n' http://192.168.64.3:31534/
hello world
➜  test-node git:(master) ✗ curl -w '\n' http://192.168.64.3:31534/
hello world
➜  test-node git:(master) ✗ curl -w '\n' http://192.168.64.3:31534/
hello PrestaShop
➜  test-node git:(master) ✗ curl -w '\n' http://192.168.64.3:31534/
hello world
➜  test-node git:(master) ✗ curl -w '\n' http://192.168.64.3:31534/
hello world
➜  test-node git:(master) ✗ curl -w '\n' http://192.168.64.3:31534/
hello world
➜  test-node git:(master) ✗ curl -w '\n' http://192.168.64.3:31534/
hello world
➜  test-node git:(master) ✗ curl -w '\n' http://192.168.64.3:31534/
hello PrestaShop
➜  test-node git:(master) ✗ curl -w '\n' http://192.168.64.3:31534/
hello world
➜  test-node git:(master) ✗ curl -w '\n' http://192.168.64.3:31534/
hello PrestaShop
➜  test-node git:(master) ✗ curl -w '\n' http://192.168.64.3:31534/
hello world
➜  test-node git:(master) ✗ curl -w '\n' http://192.168.64.3:31534/
hello world
➜  test-node git:(master) ✗ curl -w '\n' http://192.168.64.3:31534/
hello world
➜  test-node git:(master) ✗ curl -w '\n' http://192.168.64.3:31534/
hello world
➜  test-node git:(master) ✗ curl -w '\n' http://192.168.64.3:31534/
hello world
➜  test-node git:(master) ✗ curl -w '\n' http://192.168.64.3:31534/
hello world
➜  test-node git:(master) ✗ curl -w '\n' http://192.168.64.3:31534/
hello PrestaShop

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Test node PrestaShop

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