Example of Spring Boot Datadog ready application that can be deployed in openshift and send metrics to datadog with configuration that allows investigating specific instances of an application (by pod name).

Example application was developed in Spring Boot.
Minishift was used to deploy application locally for tests.

Application uses POD_NAME environment variable to send metrics to datadog with proper id, so it is possible to investigate which pod sends particular metrics.

I used minishift to easily simulate production environment scenario and test case with sending metrics from every pod but with id of a pod.

In this example I used default spring boot metrics e.g memory usage, CPU usage etc. but I also wrote a functionality to send metrics about HTTP response codes.

• Install Docker
  Docker CE INSTALLATION

• Download minishift
  Installing minishft
  Minishift releases

• Set up virtualization environment for minishift Setting Up the Virtualization Environment

• Download oc tools oc tools

1. Build service:
   docker build .
2. Run minishift:
   ./minishift start --show-libmachine-logs -v5
3. Configure minishift:
   oc login -u system:admin
./oc adm policy add-cluster-role-to-user cluster-admin admin
./oc create is test-image-stream -n myproject
4. Do port forwarding:
   oc login -u system:admin
oc project default oc get pods - check exact name of a pod with docker-registry in name
   oc port-forward docker-registry-1-zxsxx 8089:8089
5. Login to minishift docker registry with token from minishift console:
   • While starting minishift, there will be an url in logs to access minishift console
   • Login with admin username and any password
   • Click on right upper corner icon and chose Copy Login Command
   • Login command has been placed in clipboard, paste it in any text editor and extract token part from it
     docker login -u admin -p hp57zxkJ8jvxgtDMgDIXNDTCeBwlML_l_csut1eyYVk localhost:5000 - use that token in docker login command
6. Upload docker image:
   docker tag datadog-example localhost:5000/myproject/datadog-example
docker push localhost:5000/myproject/datadog-example
7. Use uploaded docker image:
   • Log in to minishift web console
   • Choose My Project project
   • Choose Deploy Image
   • In Image Stream Tag choose myproject then test and latest (if nothing can be selected in third box, just click on it and press enter), then click Deploy
8. Configure environment variables:
   • In test deployment, in actions choose Edit YAML
   • Modify config to contain POD_NAME variable

     containers:
       - env:
           - name: POD_NAME
             valueFrom:
               fieldRef:
                 apiVersion: v1
                 fieldPath: metadata.name
   

   • In Environemnt of test add other environment variables:
     • DATADOG_API_KEY: has to be fetched from https://app.datadoghq.com/account/settings#api
     • DATADOG_APPLICATION_KEY: has to be fetched from https://app.datadoghq.com/account/settings#api
9. Check datadog metric explorer:
   • Go to https://app.datadoghq.com/metric/explorer

• http://localhost:8080/test-200 - Test 200 HTTP response code metric
• http://localhost:8080/test-500 - Test 500 HTTP response code metric

Completely reset minishift:
minishift delete --force --clear-cache
minishift stop