Any doc reference on /entropy file ?
rwmaillists at googlemail.com
Tue Dec 16 14:43:17 UTC 2008
On Tue, 16 Dec 2008 14:08:10 +0100
Bernard Dugas <bernard at dugas-family.org> wrote:
> When i look at / in a standard installation like :
> FreeBSD XXX 7.0-RELEASE FreeBSD 7.0-RELEASE #0: Sun Feb 24 19:59:52
> UTC 2008 root at logan.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC
> There is only 1 file, named entropy :
> -rw------- 1 root wheel 4096 Dec 11 17:36 entropy
> I can't find any reference to that file in FreeBSD doc.
It contains random numbers that are written-out at shutdown and used to
seed /dev/random on the next boot.
> Do i have to keep it read/write ? Can i put it in /var instead of /
> to be able to keep / read-only ?
It has to be on the root-partition, if it's going to be used.
You can set entropy_file=NO if you don't want it. There are additional
entropy files under /var, and the system generates it's own entropy
during the boot stage, which is good enough for normal cases.
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