# quota - display disk usage and limits
# rquota - implement quotas on remote machines
# fstab - static information about the filesystems
# edquota - edit user quotas
# setquota - set disk quotas (Command line editor)
# quotacheck - scan a filesystem for disk usage, create, check and repair quota files
# quotaon - turn filesystem quotas on
# quotaoff - turn filesystem quotas off
# repquota - produce a summary of quota information for a file system
# convertquota - convert quota from old file format to new one. Convert quota.user to aquota.user
# quotactl - manipulate disk quotas (C programmer interface)
The default Red Hat/Fedora Core Linux kernel is shipped quota ready. If you have streamlined your kernel by rebuilding it with fewer options, make sure it has been configured with quotas support. When using the tools xconfig or menuconfig be sure to reply y to:
Quota support (CONFIG_QUOTA) [n] y
Configuration of disk usage quotas on Linux - Perform the following as root:
- Edit file /etc/fstab to add qualifier "usrquota" or "grpquota" to the partition. The following file system mounting options can be specified in /etc/fstab: grpquota, noquota, quota and usrquota. (These options are also accepted by the mount command but ignored.) The filesystem when mounted will show up in the file /etc/mtab, the list of all currently mounted filesystems.)
- To enable user quota support on a file system, add "usrquota" to the fourth field containing the word "defaults".
-
...
/dev/hda2 /home ext3 defaults,usrquota 1 1
...
-
- Replace "usrquota" with "grpquota", should you need group quota support on a file system.
-
...
/dev/hda2 /home ext3 defaults,grpquota 1 1
...
-
- Need both user quota and group quota support on a file system?
-
This enables user and group quotas support on the /home file system....
/dev/hda2 /home ext3 defaults,usrquota,grpquota 1 1
...
-
- To enable user quota support on a file system, add "usrquota" to the fourth field containing the word "defaults".
- touch /partition/aquota.user
where the partition might be /home or some partition defined in /etc/fstab.
then
chmod 600 /partition/aquota.userThe file should be owned by root. Quotas may also be set for groups by using the file aquota.group
Quota file names:
- Quota Version 2 (Linux 2.4/2.6 kernel: Red Hat 7.1+/8/9,FC 1-3): aquota.user, aquota.group
- Quota Version 1 (Linux 2.2 kernel: Red Hat 6, 7.0): quota.user, quota.group
- Re-boot or re-mount file partition with quotas.
- Re-boot: shutdown -r now
- Re-mount partition: mount -o remount /partition
After re-booting or re-mounting the file system, the partition will show up in the list of mounted filesystems as having quotas. Check /etc/mtab:-
...
/dev/hda5 / ext3 rw,usrquota 0 0
...
- quotacheck -vgum /partition
or
quotacheck -vguma- For example (Linux kernel 2.4+: Red Hat 7.1+, Fedora): quotacheck -vguma
quotacheck: WARNING - Quotafile //aquota.user was probably truncated. ...
quotacheck: Scanning /dev/hda5 [/] done
quotacheck: Checked 9998 directories and 179487 files
- For example (Linux kernel 2.2: Red Hat 6/7.0): quotacheck -v /dev/hda6
System response:Scanning /dev/hda6 [/home] done
Checked 444 directories and 3136 files
Using quotafile /home/quota.user
Quotacheck is used to scan a file system for disk usages, and updates the quota record file "quota.user/aquota.user" to the most recent state. It is recommended thet quotacheck be run at bootup (part of Redhat default installation)
Man page: quotacheck - scan a filesystem for disk usage, create, check and repair quota files
- For example (Linux kernel 2.4+: Red Hat 7.1+, Fedora): quotacheck -vguma
- quotaon -av
System Response: /dev/hda6: user quotas turned onquotaon - enable disk quotas on a file system.
quotaoff - turn off disk quotas for a file system.Man page: quotaon - turn filesystem quotas on and off
- edquota -u user_id
Edit directly using vi editor commands. (See below for more info.)
For example: edquota -u user1- System Response (RH 7+):
Disk quotas for user user1 (uid 501):
Filesystem blocks soft hard inodes soft hard
/dev/hda5 1944 0 0 120 0 0
- blocks: 1k blocks
- inodes: Number of entries in directory file
- soft: Max number of blocks/inodes user may have on partition before warning is issued and grace persiod countdown begins.
If set to "0" (zero) then no limit is enforced. - hard: Max number of blocks/inodes user may have on partition.
If set to "0" (zero) then no limit is enforced.
- System Response (RH 6):
Quotas for user user1:
Something failed if you get the response:
/dev/sdb6: blocks in use: 56, limits (soft = 0, hard = 0)
inodes in use: 50, limits (soft = 0, hard = 0)
/dev/sdb6: blocks in use: 0, limits (soft = 0, hard = 0)
Edit limits:
inodes in use: 0, limits (soft = 0, hard = 0)
Quotas for user user1:
/dev/hda6: blocks in use: 992, limits (soft = 50000, hard = 55000)
inodes in use: 71, limits (soft = 10000, hard = 11000)
If editing group quotas: edquota -g group_name
Man page: edquota - edit user quotas
- System Response (RH 7+):
- List quotas:
quota -u user_idFor example: quota -u user1
System response:Disk quotas for user user1 (uid 501):
If this does not respond similar to the above, then restart the computer: shutdown -r now
Filesystem blocks quota limit grace files quota limit grace
/dev/hda6 992 50000 55000 71 10000 11000
*** Report for user quotas on device /dev/hda5 Block grace time: 7days; Inode grace time: 7days Block limits File limits User used soft hard grace used soft hard grace ---------------------------------------------------------------------- root -- 4335200 0 0 181502 0 0 bin -- 15644 0 0 101 0 0 ... user1 -- 1944 0 0 120 0 0No limits shown with this user as limits are set to 0.
One more way to set quota
setquota -g $group $blocks $blocks 0 0 -a
setquota -u $username $blocks $blocks 0 0 -a
Replace $group, $username and $blocks. Note: $blocks is the quota size in MB * 1024! To deactivate quotas for a user or group, run these commands and set $blocks to 0.