Red Hat LINUX 7.2 Reference Manual page 25

Section 1.2:Overview of Filesystem Hierarchy Standard (FHS)
|- bin
|- doc
|- etc
|- games
|- include
|- lib
|- libexec
|- sbin
|- share
|- src
The /var Directory
Since the FHS requires that you be able to mount /usr read-only, any programs that write log files or
need spool or lock directories should probably write them to the /var directory. The FHS states
/var is for:
"...variable data files. This includes spool directories and files, administrative and log-
ging data, and transient and temporary files."
The following directories should be subdirectories of /var:
/var
|- arpwatrch
|- cache
|- db
|- ftp
|- gdm
|- kerberos
|- lib
|- local
|- lock
|- log
|- named
|- nis
|- opt
|- preserve
|- run
+- spool
|- anacron
|- at
|- cron
|- fax
|- lpd
|- mail
|- mqueue
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