Not enough entropy to support /dev/random in docker containers running in boot2docker

Question

Running out of entropy in virtualized Linux systems seems to be a common problem (e.g. /dev/random Extremely Slow?, Getting linux to buffer /dev/random). Despite of using a

Answer 1

Another option is to install the rng-tools package and map it to use the /dev/urandom

  yum install rng-tools
  rngd -r /dev/urandom 

With this I didn't need to map any volume in the docker container.