ubuntu 12.04 - disk quota

install quota program:
	sudo apt-get install quota quotatool

edit /etc/fstab:
	sudo nano /etc/fstab

add usrquota and grpquota in the filesystem where you want to enforce it. it should look like below:
# / was on /dev/sda1 during installation
UUID=0229ace1-de12-4cfc-83cf-990dde59f043 /               ext4    errors=remount-ro,usrquota,grpquota 0       1

Restart/Reboot computer:
	sudo reboot

After Restart check in the root(/) if aquota.user and aquota.group is present. During restart quotacheck and quotaon comand was executed. which means after restart disk quota is running:
	cd /
	ls -al

To set or change quota size to a user, use edquota command:
	sudo edquota -u the_username_here

	change soft(kbytes) - size in kb where when the soft quota is reached, it will start the warning until the time grace period but will not exceed the hard quota.
	change hard(kbytes) - size in kb where the user should not exceed.

To modify default grace period:
	sudo edquota -t

To check users and quota data with repquota command:
	sudo repquota -u /

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USEFUL DISK QUOTA COMMANDS:

run quotacheck command to prepare filesystem for quota:
	sudo quotacheck -mavug

	options:
	m - don't try to remount the filesystem
	a - all filesystems in /etc/mtab
	v - verbose, display extra information
	u - only user quotas listed in /etc/mtab
	g - only group quotas listed in /etc/mtab

turn quotas on with quotaon command:
	sudo quotaon -avug

turn quotas off with quotaoff command:
	sudo quotaoff -avug

	options for quotaon and quotaoff:
	a - all filesystems in /etc/fstab with quotas
	v - verbose, display extra information
	u - users, manipulate user quotas
	g - groups, manipulate group quotas

if you have a desktop environment then logout and switch to tty1(ctrl+alt+f1) to avoid some errors when running quota command, and then after running the command switch back tty7(ctrl+alt+f7) and login back to your desktop:

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DISK QUOTA FOR A MOUNTED DRIVE(ex. /home):

if you want to enforce quota on a partition other than the root(/), for example another drive with mount point /home:

edit /etc/fstab and put usrquota and grpquota in /home mount point:
# /home was on /dev/md0 during installation
UUID=********** /home ext4 defaults,errors=remount-ro,usrquota,grpquota 0 2

Restart/Reboot computer:
	sudo reboot

After Restart check in the /home folder if aquota.user and aquota.group is present. During restart quotacheck and quotaon comand was executed. which means after restart disk quota is running:
	cd /home
	ls -al

To set or change quota size to a user, use edquota command:
	sudo edquota -u the_username_here

	change soft(kbytes) - size in kb where when the soft quota is reached, it will start the warning until the time grace period but will not exceed the hard quota.
	change hard(kbytes) - size in kb where the user should not exceed.

To modify default grace period:
	sudo edquota -t

To check users and quota data with repquota command:
	sudo repquota -u /home