/dev/ links disappearing
darylXYZ at ci.com.au
Fri Nov 24 02:20:31 UTC 2006
>> I am running ubuntu 6.06 after upgrading from and OLD Debian system. I
>> have noticed that my computer thinks it now know better than me. I put
>> a few symlinks into /dev/ to point to generic names like /dev/backup which
>> points to a tape device. Also things like a serial port I have called
>> /dev/modem that points to /dev/ttyS0. Problem is that these symlinks keep
>> disappearing. I am not sure what is cleaning them up. I am sure this has
>> something to do with udevd but I am unable to find any info on what I need
>> to do.
> OK, /dev is entirely virtual, so you can't create links on the "filesystem"
> and expect them to survive a reboot.
> Basically you have to modify rules in /etc/udev/rules.d/. Look
> at /etc/udev/rules.d/60-symlinks.rules (at least in edgy - otherwise look
> at any .rules files anywhere under /etc/udev to get an idea).
> You can create your own 50-local.rules and add rules like:
> KERNEL="ttyS0", SYMLINK+="modem"
> KERNEL="xxxx", SYMLINK+="backup"
> (where 'xxxx' is the device name of your tape device). Note, I already have
> a default entry for ttyLTM[0-9]* in 60-symlinks.rules that sets /dev/modem,
> so you would definitely need your local rules to execute before that - the
> first such allocation of symlink name wins iirc.
This not only pointed me in the right direction it also dotted the i's and
crossed the T's. All working now.
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