Bright:Setup user quotas

• Lets apply user quotas to /home on a Bright headnode
• Running Centos 6.5
• Applying qoutas to an EXT3 filesystem
• More details and explanations here: https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Storage_Administration_Guide/ch-disk-quotas.html
• The package quota should be installed (is installed by default on bright)

Setup quotas within /etc/fstab

• Need to add usrquota,grpquota to the /etc/fstab file for the home dir mount point
• Lets check the home mount point (in this instance its just / for bright)

[root@trainning ~]# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/md126      426G   14G  392G   4% /
tmpfs            16G   84K   16G   1% /dev/shm
/dev/md125      496M   24M  447M   6% /boot

• Lets update the /etc/fstab file with the parameters usrquota,grpquota for user mount points.

[root@trainning ~]# cat /etc/fstab 
UUID=9586a511-9b87-48e1-8749-f5fa0ebabd01 /                              ext3       defaults,noatime,nodiratime,usrquota,grpquota              0 1
UUID=6b542d80-a228-47bc-9e39-831f37bc074c /boot                          ext2       defaults,noatime,nodiratime              0 2
UUID=5e9078a4-9975-4659-839f-9749ceb8ab02 swap                           swap       defaults                                 0 0
proc		/proc	proc	defaults,nosuid	0 0
sysfs		/sys	sysfs	noauto	0 0
devpts		/dev/pts	devpts	mode=0620,gid=5	0 0
tmpfs		/dev/shm	tmpfs	defaults	0 0

# This section of this file was automatically generated by cmd. Do not edit manually!
# BEGIN AUTOGENERATED SECTION -- DO NOT REMOVE
# END AUTOGENERATED SECTION   -- DO NOT REMOVE

• Remount the filesystem and verify the args in mtab

[root@trainning ~]# mount -o remount /
[root@trainning ~]# cat /etc/mtab
/dev/md126 / ext3 rw,noatime,nodiratime,usrquota,grpquota 0 0
proc /proc proc rw,nosuid 0 0
sysfs /sys sysfs rw 0 0
devpts /dev/pts devpts rw,mode=0620,gid=5 0 0
tmpfs /dev/shm tmpfs rw 0 0
/dev/md125 /boot ext2 rw,noatime,nodiratime 0 0
none /proc/sys/fs/binfmt_misc binfmt_misc rw 0 0
sunrpc /var/lib/nfs/rpc_pipefs rpc_pipefs rw 0 0
nfsd /proc/fs/nfsd nfsd rw 0 0
gvfs-fuse-daemon /root/.gvfs fuse.gvfs-fuse-daemon rw,nosuid,nodev 0 0

Create the Quota Database

• Note: For Bright because the / folder is used and cannot be mounted read-only, we needed for force the initial check
• Note: This took a few mins to run

• Perform an initial check of the system

[root@trainning ~]# quotacheck -cug /
quotacheck: Cannot remount filesystem mounted on / read-only so counted values might not be right.
Please stop all programs writing to filesystem or use -m flag to force checking.
[root@trainning ~]# quotacheck -cugm /

• After the files are created, run the following command to generate the table of current disk usage per file system with quotas enabled:

[root@trainning ~]# quotacheck -avugm
quotacheck: Your kernel probably supports journaled quota but you are not using it. Consider switching to journaled quota to avoid running quotacheck after an unclean shutdown.
quotacheck: Scanning /dev/md126 [/] done
quotacheck: Checked 24615 directories and 249780 files

Set a user quota

• Use the edquota command. We'll need to set soft and hard limits here. The number are based on KB so scale up for GB
• E.g. 5GB limit

[david@hairybacon-2 ~]$ echo "5 * 1024 * 1024" | bc 
5242880

• Set the limit using 5242880

[root@trainning ~]# edquota david
# which will provide you with a vi screen with the following, edit numbers as below
Disk quotas for user david (uid 1003):
  Filesystem                   blocks       soft       hard     inodes     soft     hard
  /dev/md126                       60    5242880    5242880         15        0        0

• Turn quotas on

$ quotaon -a

Verify the user quota

• check using the quota command

[root@trainning ~]# edquota -u david -f / 
[root@trainning ~]# quota -u david
Disk quotas for user david (uid 1003): 
     Filesystem  blocks   quota   limit   grace   files   quota   limit   grace
     /dev/md126      60  5242880 5242880              15       0       0

• • • TBC created file, met limits, removed files, says limit exceeded!?