Messages in this thread | | | From | Andreas Dilger <> | Subject | Re: filesystem in a blackbox ? | Date | Thu, 10 Aug 2000 22:31:10 -0600 (MDT) |
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Mike writes: > Wu writes: > >I made a linux-router box without monitor or keyboard. > >When it running, it write logs to HD. If I turn off the box, > >the filesystem maybe be damaged and can't boot again. > > > >Any way to keep it's filesystem sync ?
The obvious solution is to use a journalling filesystem, like ext3. I've put ext3 on my dev box, and now I never need to fsck when I crash the kernel.
> Hmm. You need a way of remotely shutting down the box. Install > ssh on the machine, and block ssh access with ipchains so only a > certain machine or machines can ssh in. Log in via ssh to > shutdown.
SSH is good if you can actually get net access to the system.
> Alternatively, you could use some jumper in the machine to detect > an externally connected switch of some kind.
I made a small switch out of the keyboard lock (10 kOhm resistor + wire), and attached it to the serial port on my router box. I have upsd listening on the serial port, and it does a shutdown for me. I think the schematics for the switch were in the UPS HOWTO or similar. I didn't even have to write a line of code (OK, I added beeps to /etc/init.d/halt to let me know when it was finished).
Cheers, Andreas -- Andreas Dilger \ "If a man ate a pound of pasta and a pound of antipasto, \ would they cancel out, leaving him still hungry?" http://www-mddsp.enel.ucalgary.ca/People/adilger/ -- Dogbert
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