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I have a server that runs a mail relay (CentOS and Procmail). However, it's stopped doing the relay, as it is out of free disk space. I desperately need to free some space, and unfortunately the person who used to manage it left the company without leaving any documentation. Is there a quick way to find and delete old log files?
Not recommended because there may be useful diagnostic information in there ... are there any real big ones? ls -lrt /var/log would show.
If you have the installation media or another similar system you could more safely remove the documentation under /usr/doc -- it's big (a few hundred MB) and not necessary (AFAIK!) for the running system.
I think can remove some old logfiles if you don't need for longer use(Ex- message, message.1.gz, message.2.gz etc.. as like this, check which is the most recent file)
Did you check each files size in /var/log directory because at this point we can advice to check logfile size only
can you post the output of "ll" in /var/log directory
Again, mails to root may contain important diagnostic information -- so should (TM) be checked regularly. In an emergency you could delete /var/spool/mail/root but you might prefer to edit it and delete only mails more than say a month old.
I've deleted these, and I've now got 300M free, which has allowed the mail relay to start working again. Thanks very much for your help, at least now I've got some breathing space to find a long term decision.