On Tue, 31 Dec 1996, Paul Ferguson wrote:
> Frankly, I think the suggestion of using non-writable media (ie. CD-ROMs)
> is rather unpractical. Most sufficiently interesting web sites contain
> ever-changing & constantly updated information, such as news, various
> daily features, etc.
>
> Not a practical solution.
O.K. If you want to be really secure and still updateable, do this:
1.) Use two mirrored disks. One is mounted read-only one is mounted
read/write. The two disks can contain not only the WEB data but
the whole operating system as well. As someone already noted
before: Linux (and I'm sure other Unixes as well) can be setup
to run from an RO media.
2.) When updates are required: Mount the second mirror disk r/w,
do the update and reboot from the second mirror disk which is
now mounted read-only. If the system is setup properly,
the reboot time and thus the outage time can be kept quite low.
3.) When the system comes up, mount the first disk RW and apply
the updates as well to keep the disk contents in sync.
If the outage during the update is unacceptable what about using
two mirror machines: One standby and RW for updates and one
on-line running RO. After the update, machines could swap their
functions immediately. Sure: This would require some fancy IP
address setup.
Tom
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