I have a server that cannot generate enough entropy to support `/dev/random`. The particular piece of software having problems can't be configured to use `/dev/urandom`. 

I tried moving `/dev/random` to `/dev/realrandom` and symlinking `/dev/random` to `/dev/urandom`, but `lsof /dev/realrandom` still shows processes using it.

In [Does 'urandom' share the same entropy of 'random'?](https://superuser.com/questions/150988/does-urandom-share-the-same-entropy-of-random), the suggestion is to use `mknod /dev/random 1 9`. Will this hold across restarts? Should I be using udev somehow?