Date: Fri, 13 Nov 2009 16:01:46 -0800 From: Chuck Swiger <cswiger@mac.com> To: David Allen <the.real.david.allen@gmail.com> Cc: freebsd-questions@freebsd.org, James Phillips <anti_spam256@yahoo.ca> Subject: Re: APM Message-ID: <D2C5A981-0ED8-4280-929B-EAC85D5D1D7A@mac.com> In-Reply-To: <2daa8b4e0911131554g1e13bdbbh123f52fb2572d5a0@mail.gmail.com> References: <474730.92984.qm@web65506.mail.ac4.yahoo.com> <E7630082-8284-45A3-AF72-7C3DB2BBB9DA@mac.com> <2daa8b4e0911131448h3444444ag67ad05bbbf7df60@mail.gmail.com> <07E2B7F8-3B7B-4B1C-AE6E-B5219BEDE769@mac.com> <2daa8b4e0911131554g1e13bdbbh123f52fb2572d5a0@mail.gmail.com>
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Hi--
On Nov 13, 2009, at 3:54 PM, David Allen wrote:
>> I'd consider adding something to /etc/rc.d/mountcritlocal (which
>> normally mounts the local filesystems) to setup a RAMdisk on /var and
>> then do "rsync -a /var_template /var" (or use a dump/restore or tar
>> pipeline).
>
> At the risk of sounding obtuse while asking for more help, I can work
> out the rsync or dump part, but the rest I don't get. The
> mountcritremote essentially just does a mount -a -t ..., yes? To
> insert a few mdmfs commands followed by rsync commands, for example,
> would require re-writing most the script. Is there a better place to
> this?
Quite possibly. I used NetBSD for a flash-based Soerkris boxes a
while back, rather than NanoBSD. It looks like reading /etc/
rc.initdiskless might be informative.
> The reason I ask is that some time ago I had a look at nanobsd which
> is designed to run on RO flash media. The /var and /tmp directories
> are created as memory devices that supposedly get re-populated from a
> /cfg directory at boot.
Right...
> The /usr/src/tools/tools/nanobsd/nanobsd.sh setup script has a
> function named setup_nanobsd_etc. Essentially, it writes out an
> /etc/fstab file and does a 'touch /etc/diskless'. Unless there's
> magic that happens behind the scenes with that /etc/diskless file, I
> don't see how anything gets re-populated.
The existence of /etc/diskless means /etc/rc runs /etc/rc.initdiskless:
% grep diskless /etc/rc
dlv=`/sbin/sysctl -n vfs.nfs.diskless_valid 2> /dev/null`
if [ ${dlv:=0} -ne 0 -o -f /etc/diskless ]; then
sh /etc/rc.initdiskless
# Run these after determining whether we are booting diskless in order
# to minimize the number of files that are needed on a diskless system,
Regards,
--
-Chuck
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