On Oct 9, 2010, at 9:58 AM, Caleb Stein wrote:
> On Fri, 08 Oct 2010 22:46:55 -0700, Robert Huff <roberth...@rcn.com> wrote:
>
>>
>> Caleb Stein writes:
>>
>>> I'm constantly getting the message, ":/ write failed, filesystem
>>> is full", so I did df, and it said that my / filesystem was at
>>> 108%. What files can I delete to free some space?
>>
>> Start by checking the contents of /tmp.
>> Any *.core in /root you don't recognize is suspect.
>> After that? Try:
>>
>> du -x / | sort -n -r | head -n 40
>>
>> Look in those directories.
>>
>>
>> Robert Huff
>>
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>
> So is it safe to do "rm -rf /tmp/*"?
Generally yes, though it's always safest to check to make sure you're not
deleting any files that actively held open by running processes. You can do
this by:
fstat -f /tmp
(or if /tmp is not it's own filesystem -- if it lives on the `/' partition that
is)
fstat | grep /tmp
If you a find a process that has open file descriptors in `/tmp', you can do
two things:
1. You can kill the process (the third column in the output of fstat(1) is the
process ID or PID). Continue until no processes are left holding open
file-descriptors in `/tmp'. Then it would be safe to wipe everything in that
directory.
2. You can avoid removing the files that are open. The sixth column in the
output of fstat(1) is the inode/inum of the file on the device/mount (the
device/mount column is the fifth column, just to the left of the inode/inum
column). You can descend into `/tmp' and say `ls -li' to show the inode
numbers, or you can say `find /tmp -inum INODE' to find the associated file.
You would want to avoid deleting that file because a running process has it
open.
In addition, there's an alternative way to clear the temporary files of a
system (FreeBSD-5.0 and higher):
(as root or with sudo(8)) sh -c 'clear_tmp_enable=YES;
/etc/rc.d/cleartmp start'
NOTE: Unless you've customized your rc.conf(5) files to change the defaults,
clear_tmp_enable defaults to "NO" and clear_tmp_X defaults to "YES" (see
`/etc/defaults/rc.conf'), so passing a "start" to this rc.d script will (by
default) only clear out the X related temporary files located in `/tmp',
whereas the above command will get the rc.d script to a full cleanup of `/tmp'
(regardless of whether you've customized rc.conf(5) or not).
The rc.d script (cleartmp) _does_ do a slightly more sophisticated clean-up of
the `/tmp' directory in that it will not kill-off the `lost+found' directory if
it exists, and will also ignore `quota.user'/`quota.group' files. Lastly, it
will recreate the X11 socket directories (`.X11-unix', `.ICE-unix',
`.XIM-unix', and `.font-unix').
In addition, the above command is better in that it will clean up files
beginning with `.' whereas your command which only specified "rm -Rf /tmp/*"
won't get files that begin with `.' (of which there may be numerous).
Last but not least, if your system is running XFree86 or Xorg, running either
the "rm -Rf /tmp/*" -or- the cleartmp rc.d script is bad while the X server is
running since it might cause the running X server to lose its mind (these are
lock-files in `/tmp' that shouldn't be removed while the server is running).
Again, fstat(1) is your friend. Though, alternatively you could bring the X
server down temporarily, clear `/tmp' however you prefer, and then restart the
`X' server.
If this is all too overwhelming, you could always safely just clear `/tmp' and
then immediately reboot. Or, plop clear_tmp_enable="YES" into rc.conf(5),
reboot, and the system will clear `/tmp' for you on boot-up.
--
Devin
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--
Cheers,
Devin Teske
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