Docker Haveged is a container as an entropy gathering service.
In case you need an entropy gathering service on your docker host but don't want to / can't install locally an entropy gathering service.
The service makes more sense on Cloud servers and more specifically on CoreOS servers where you cannot install locally services.
The purpose of the service is to make sure you have available entropy on your host. To check if you are running low:
If the number is below
1000 then it is probably depleted.
To run the container:
docker run --privileged -d harbur/haveged:1.7c-1
In order to test the quality of entropy you can use rngtest
docker run --rm --privileged --entrypoint bash harbur/haveged:1.7c-1 -c 'cat /dev/random | rngtest -c 1000'