RE: looking for error codes

My work around read-only systems extended this, to allow a general FreeBSD system to come up with "main media" write locked. In the RC files, MFS partitions were made for /tmp, /var, and other places we needed to write. Now that we're upgrading to a later BSD, I hope to refit these with union filesystems instead, to save space and complexity.

--
Andrew Duane Juniper Networks
978-589-0551 10 Technology Park Dr
aduane@xxxxxxxxxxx Westford, MA 01886-3418

________________________________________
From: owner-freebsd-hackers@xxxxxxxxxxx [owner-freebsd-hackers@xxxxxxxxxxx] On Behalf Of Warner Losh [imp@xxxxxxxxxx]
Sent: Saturday, April 02, 2011 11:54 AM
To: perryh@xxxxxxxxxxxxxx
Cc: freebsd-hackers@xxxxxxxxxxx; m.e.sanliturk@xxxxxxxxx; avg@xxxxxxxxxxx; freebsd-arch@xxxxxxxxxxx
Subject: Re: looking for error codes

On Apr 2, 2011, at 1:50 AM, perryh@xxxxxxxxxxxxxx wrote:

With respect to my knowledge , no one of the operating systems
has a facility to separate read-only and modifiable parts ...

SunOS 4 had a partial solution to this, by rearranging the FS layout
so that /usr could be mounted read-only (and often, from a server --
IIRC a single /usr could be shared among multiple diskless clients).
They used quite a few symlinks so that things could be found in
their accustomed places although actually located elsewhere. The
scheme was fairly well described in the SunOS 4 manual set; granted
_finding_ a SunOS 4 manual set these days may be a challenge :)

FreeBSD can do this too. In fact, NanoBSD relies heavily on having most of the system mounted read-only, and has MFS partitions for /etc and /var.

Warner


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Relevant Pages

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