ElectroMech tested Document
WARNQUOTA SETUP HOWTO

warnquota - send mail to users over quota

warnquota - checks the disk quota for each local filesystem and mails a warning message to those users who have reached their softlimit. It is typically run via cron(8).

Remember it working on softlimit.

The sample warnquota file is as below

[root@station253 ~]# cat /etc/warnquota.conf
MAIL_CMD              = "/usr/sbin/sendmail -t"
FROM              = " This e-mail address is being protected from spambots. You need JavaScript enabled to view it "
SUBJECT            = NOTE: Your mailbox has exceeded allocatted disk space limits
CC_TO             = " This e-mail address is being protected from spambots. You need JavaScript enabled to view it "
SUPPORT             = " This e-mail address is being protected from spambots. You need JavaScript enabled to view it "
PHONE             = "555 555-1212"
MESSAGE              = Your mailbox has exceeded the allotted limit\
on this server|Please delete any unnecessary email in your mailbox on:|
SIGNATURE             = This message is automatically generated by the mail system.
Now I have setup one partition with user quota and setup testuser1 as below

[root@station253 ~]# mount
/dev/mapper/vg_station253-LogVol00 on / type ext4 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw)
/dev/sda12 on /boot type ext3 (rw)
tmpfs on /dev/shm type tmpfs (rw,rootcontext="system_u:object_r:tmpfs_t:s0")
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
gvfs-fuse-daemon on /home/nilesh/.gvfs type fuse.gvfs-fuse-daemon (rw,nosuid,nodev,user=nilesh)
/dev/sda8 on /mnt/data type ext3 (rw,usrquota)

[root@station253 ~]#

[root@station253 ~]# repquota /dev/sda8
*** Report for user quotas on device /dev/sda8
Block grace time: 7days; Inode grace time: 7days
Block limits               File limits
User           used soft hard grace used soft hard grace
----------------------------------------------------------------------
root -- 416088             0      0         1608 0 0
nilesh -- 1703852            0      0        18012 0 0
testuser1 +- 5120 4096 5120 6days                       200
1/3

Now
[root@station253 ~]# su - testuser1

[testuser1@station253 ~]$ quota
Disk quotas for user testuser1 (uid 501):
Filesystem blocks quota limit grace files quota limit grace
/dev/sda8 5120* 4096 5120 6days             2     0     0

[testuser1@station253 ~]$

Now when we give following command

[root@station253 ~]# warnquota -u testuser1

[root@station253 ~]#
Once you execute above command try to check log with following commands.

[root@station253 ~]# tail -f /var/log/maillog
--snip--

Dec 13 23:38:50 station253 postfix/local[3633]: CFD592D100: to=,
orig_to=, relay=local, delay=0.09, delays=0.06/0.02/0/0.01, dsn=2.0.0,
status=sent (delivered to maildir)
Dec 13 23:38:50 station253 postfix/local[3633]: CFD592D100:
to=, orig_to=, relay=local, delay=0.09,
delays=0.06/0.03/0/0, dsn=2.0.0, status=sent (delivered to maildir)
--snip--
and

[testuser1@station253 ~]$ mutt -f Maildir
17 Dec 13 support@example (0.4K) NOTE: Your mailbox has exceeded allocatted disk space limits
18 N Dec 13 support@example (0.4K) NOTE: Your mailbox has exceeded allocatted disk space
limits
( Last two line is as above )
(The detail of last main is as below)
(content of mail )
Date: Sun, 13 Dec 2009 23:38:50 +0530 (IST)
From: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
To: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
Cc: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
Subject: NOTE: Your mailbox has exceeded allocatted disk space limits
Your mailbox has exceeded the allotted limit on this server
Please delete any unnecessary email in your mailbox on:
/dev/sda8


Block limits        File limits
Filesystem         used soft hard grace used soft hard grace
/dev/sda8     +- 5120 4096 5120 6days           200
This message is automatically generated by the mail system.
( End of mail )
When we execute only warnquota command it will send mail to all users whose mail quota is exceeded

[root@station253 ~]# warnquota
From tail -f /var/log/maillog
Dec 13 23:44:03 station253 postfix/local[3699]: 7DC262D105:
to=, orig_to=, relay=local, delay=0.11,
delays=0.05/0.04/0/0.02, dsn=2.0.0, status=sent (delivered to maildir)
Dec 13 23:44:03 station253 postfix/qmgr[1907]: 7DC262D105: removed
Thats it !!!

By Nilesh J. Vaghela
http://www.electromech.info

Reference
http://wiki.robotz.com/index.php/Quota-_Linux_User_Quota_HowTo
man warnquota