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I am trying to start rng-tools in a SLES 11 SP3 installation inside of VirtualBox.

vagrant@sles11sp3x64:~> uname -a
Linux sles11sp3x64 3.0.93-0.8-default #1 SMP Tue Aug 27 08:44:18 UTC 2013 (70ed288) x86_64 x86_64 x86_64 GNU/Linux

All attempts have been un-successful, with the following output:

vagrant@sles11sp3x64:/etc/init.d> sudo /sbin/service rng-tools status
Checking for RNG daemon                                                                                                                                            unused
vagrant@sles11sp3x64:/etc/init.d> sudo /sbin/service rng-tools start
Starting RNG daemon  No Hardware RNG support available                                                                                                             skipped

here is the contents of /etc/default/rng-tools :

vagrant@sles11sp3x64:~> cat /etc/default/rng-tools
HRNGDEVICE=/dev/urandom

What am I missing to get VirtualBox to expose my hardware correctly?

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  • What exactly do you expect should happen? In a VM there usually are no HWRNGs. Clarify please. Commented Oct 10, 2013 at 15:20
  • @peterph For a VM, the “hardware RNG” is the RNG of the host. Commented Oct 10, 2013 at 21:43
  • @Gilles not really - you would have to emulate the HWRNG in the VM (feeding through it the entropy from the host system). /dev/random is not a HWRNG, by the way. Commented Oct 11, 2013 at 11:49

1 Answer 1

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You should be able to use the virtio-rng kernel module (in the guest). See this article for more details. I'm not sure whether VirtualBox supports it yet - if not, you might want to give QEMU a try.

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