Datadog demo

A demo application to spit out some logs and run the Datadog agent. That's it.

What's here

Three containers that spit out logs every few seconds saying "Hello from app [number]!", plus the Datadog agent container.

How to run it

Export the DD API key and push:

export DD_API_KEY=[secret datadog API key]
balena push [app or IP] --env datadog:DD_API_KEY=${DD_API_KEY}

Alternately, you could add a service variable to your application.

datadog/startup.sh sets the hostname for the agent to the device UUID, sets the API key so it can register with DD, and adds all environment variables that start with BALENA_ as tags.

TODO

• Get DD agent to see host proc/sys filesystem
• Be careful about which tags we add -- would not want to add balena API keys, say
• Don't use sed to crowbar environment variables into YAML
• More testing
• Smaller image (currently using Debian, and it's at 676MB)
• Document how to add tags of your own