Skip to content

Latest commit

 

History

History
113 lines (97 loc) · 4.55 KB

README.md

File metadata and controls

113 lines (97 loc) · 4.55 KB
Raw

Weather App Task

Task definition

Implement a Java based REST API for the Weather, which:

  • Uses a 3rd party weather forecast provider e.g. https://openweathermap.org/current
  • Provides a 3-day forecast for a requested location
  • Is deployed on a public cloud provider
  • Is containerized and deployed in k8s through a Helm chart
  • Is publicly exposed(ingress based)
  • Is higly available, spread over AZs
  • Supports update through helm

The API may support some of the following features:

  • Provides a 2-day weather statistics for a requested location(pick 3 locations)
  • Is basic auth protected(optional)

Steps to implememt

Spring Boot + Uber Jar Simple Service

As deployment part is heavier, initially make a very simple Spring service, that is in fact only a proxy from: http://<BASE_SERVICE_URL>/weather/{city} to: api.openweathermap.org/data/2.5/forecast?appid=....&units=metric&q={city} ... well this will give us 5 days forecast instead of 3, but ... good enough for a start.

To build the service use: mvn clean install

Packing it in a container

  • Use an official OpenJRE as a parent image (alpine based)
  • Pack the Uber Jar and run it on container startup

To build the container use: docker build --tag=weather-app .

Deployment

I chose AWS EKS for my needs. A standard cluster: With 2 nodes t3.micro:

After pushing the image to ECR we can use kubectl apply ... to deploy the deployment, including 2 pods and a service to expose them.

Test it

$ curl -s http://aee4f39d9c48b4c02acd1f313ad94374-1483124477.us-east-2.elb.amazonaws.com:8080/weather/Sofia | jq .
{
  "cod": "200",
  "message": 0,
  "cnt": 40,
  "list": [
    {
      "dt": 1584576000,
      "main": {
        "temp": -2.41,
        "feels_like": -5.8,
        "temp_min": -2.41,
        "temp_max": -0.02,
        "pressure": 1031,
        "sea_level": 1031,
        "grnd_level": 914,
        "humidity": 78,
        "temp_kf": -2.39
      },
      "weather": [
        {
          "id": 800,
          "main": "Clear",
          "description": "clear sky",
          "icon": "01n"
        }
      ],
      "clouds": {
        "all": 0
      },
      "wind": {
        "speed": 1.01,
        "deg": 325
      },
      "sys": {
        "pod": "n"
      },
      "dt_txt": "2020-03-19 00:00:00"
    },
    {
      "dt": 1584586800,
      "main": {
        "temp": -2.09,
        "feels_like": -5.49,
        "temp_min": -2.09,
        "temp_max": -0.3,
        "pressure": 1030,
        "sea_level": 1030,

Helm Chart

A Helm chart is also added in weatherapp folder. You can deploy the application using the command: helm install --namespace=weather weatherapp ./weatherapp

After that the application is deployed in the namespace weather

 kubectl --namespace=weather get all -o wide
NAME                              READY   STATUS    RESTARTS   AGE     IP             NODE                                        NOMINATED NODE   READINESS GATES
pod/weatherapp-564bd48d75-r9bvz   1/1     Running   0          2m47s   172.31.5.177   ip-172-31-6-95.us-east-2.compute.internal   <none>           <none>
pod/weatherapp-564bd48d75-rsdgz   1/1     Running   0          2m47s   172.31.0.192   ip-172-31-6-95.us-east-2.compute.internal   <none>           <none>

NAME                 TYPE           CLUSTER-IP     EXTERNAL-IP                                                               PORT(S)          AGE     SELECTOR
service/weatherapp   LoadBalancer   10.100.49.25   aee4f39d9c48b4c02acd1f313ad94374-1483124477.us-east-2.elb.amazonaws.com   8080:31432/TCP   2m47s   app.kubernetes.io/instance=weatherapp,app.kubernetes.io/name=weatherapp

NAME                         READY   UP-TO-DATE   AVAILABLE   AGE     CONTAINERS   IMAGES                                                          SELECTOR
deployment.apps/weatherapp   2/2     2            2           2m47s   weatherapp   733339657127.dkr.ecr.us-east-2.amazonaws.com/weatherapp:0.1.3   app.kubernetes.io/instance=weatherapp,app.kubernetes.io/name=weatherapp

NAME                                    DESIRED   CURRENT   READY   AGE     CONTAINERS   IMAGES                                                          SELECTOR
replicaset.apps/weatherapp-564bd48d75   2         2         2       2m48s   weatherapp   733339657127.dkr.ecr.us-east-2.amazonaws.com/weatherapp:0.1.3   app.kubernetes.io/instance=weatherapp,app.kubernetes.io/name=weatherapp,pod-template-hash=564bd48d75