How to clean/compress /var in Linux Red Hat

I have a Linux Red Hat v6 server and noticed that /var is 100% full. The server starts but the web application is not loading. Can this be related to the full directory and what is the best way to clean or resize the directory?

Thanks in advance
exhuserAsked:
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andreasSystem AdminCommented:
run a df -k|sort -n and you see which folders in /var use most space.

Be aware that some contant in /var is critical for system operation. So dont delete things there until you know its safe to delete this content.

If your system still has unallocated space ynd you have a LVM setup you might enlarge /var by adding unallocated space to it.
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TintinCommented:
Adding more space depends on whether you have more physical disk space and are using Logical Volume Manager (LVM).

Easiest course of action is to delete old files in /var/log

You can list old files with

find /var -type f -mtime +30 -ls

That will list any files in /var older that 30 days.
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exhuserAuthor Commented:
Most space:
1. Logs
2. Cache
3. Crash

Which ones can be safely deleted?
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legolasthehansyCommented:
The safest to remove is the crash logs but only after you have determined what program dumped them in the /var and fixed it. They contain valuable information on program being terminated abruptly.
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andreasSystem AdminCommented:
In /var/log you might safely remove all files that and with -datestamp (e.g. (messages-20141123, or cron-20140813))
This are backed up old log files.

In /var/cache are sometimes things that shouldn't be deleted so I would let this alone for now.

contents of /var/crash can be deleted if nobody want that information for error fixing anymore.
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