Consider conf.d as a volume and adding extras

[andyshinn]

To alleviate the need to build intermediate images, it might be nice to allow for /etc/dd-agent/conf.d as a persistent volume and then install some commonly required libraries (python-mysqldb, python-redis, python-rrdtool) by default.

You can then create a host directory and have YAML configurations located at ~/datadog and run the container using volumes:

$ docker run -d --privileged --name dd-agent -h $(hostname) -e API_KEY=513146123a50b321fc38548e317629ea -v /home/ubuntu/datadog:/etc/dd-agent/conf.d datadog/docker-dd-agent

[LotharSee]

The next release of the Agent (5.0) will include all the common dependencies. So you will be able to set the config with the default image + volumes when the Agent will be self-contained (in a few weeks).

[LotharSee]

Done: the Agent 5.0 is self-contained and already contains all the stuff that you may need!