Disk Quota for Linux Users

Configuration:
1. Add "usrquota" qualifier to the home partition in /etc/fstab
    LABEL=/home             /home                   ext3    defaults,usrquota        1 2
2. Create an empty file /home/aquota.user with root as owner and permission 600
    touch /home/aquota.user
    chmod 600 /home/aquota.user
3. Remount the /home partition
    mount -o remount /home
4. Check /etc/mtab
    /dev/sda5 /home ext3 rw,usrquota 0 0
5. Run quotacheck to scan the filesystem for disk usage and update the aquota.user file
    quotacheck -vum /home
6. Run quotaon -av
    /dev/sda5 [/home]: user quotas turned on
7. Edit quota for user and set the soft and hard limit for the blocks (in KB)
    edquota -u senthilkumar.v
    Disk quotas for user senthilkumar.v (uid 500):
    Filesystem                   blocks       soft       hard     inodes     soft     hard
    /dev/sda5                    409928     900000    1000000       1789        0        0

A script to add new user with quota
#!/bin/bash
real_useradd=/usr/sbin/useradd
SLIMIT=2600000
HLIMIT=3000000
if [ $# -eq 0 ] ; then
        $real_useradd
        exit
fi
a=`echo $* | grep "\-D"`
if [ $? -eq 0 ] ; then
        $real_useradd $*
        exit
fi
a=`echo $* | grep "\-g"`
if [ $? -ne 0 ] ; then
        GRP="-g devgroup"
fi
login_name=${!#}
$real_useradd $GRP $*
passwd $login_name
setquota -u $login_name $SLIMIT $HLIMIT 0 0 -a

Quota Reports:
1. List quota
    quota -u user_id
2. List users who hit the quota limit
    quota -q
3. Quota summary report
    repquota -a

Quota Check:
Add a cron entry to check the disk usage regularly
1. Add the following in /etc/cron.weekly/quotacheck
    #!/bin/bash
    /sbin/quotacheck -vum /home
2. chmod +x  /etc/cron.weekly/quotacheck