/etc/init.d/rng-tools: Cannot find a hardware RNG device to use.

[Jason Lewis]

Ah, I think I got the order wrong and inserted the OneRNG before setting up those tools. Removing and reinserting it seems to have fixed it.

entropy_available now hovers around 2000 on my machine and if I cat /dev/random to /dev/null, it reduces to 0 but instantly returns to ~2000 once I stop the cat process

For comparison, without OneRNG entropy available hovers at around 800 or so on my machine and takes a minute or two to recover from 0.

Thanks Paul,

Jason