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Linux User Management: Configuring Group Disk Quotas

User and group disk quotas set limits on how much storage a user can consume. Quotas are important to preventing users from consuming all of the disk space on a system. In this lab, students will install the `quota` package and learn to configure group and user quotas for a filesystem.

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Path Info

Clock icon Intermediate
Clock icon 30m
Clock icon Jan 31, 2020

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Table of Contents

  1. Challenge

    Create the app Group as Well as appuser1 and appuser2, and Set the app Group as the Primary Group for Both Users

    # groupadd app
    # useradd -g appuser1
    # useradd -g app appuser2
  2. Challenge

    Create a Filesystem on One of the 2 GB Drives Configured on the System

    Check to see what disks are available:

    # lsblk

    Create a partition on the /dev/xvdb disk:

    # fdisk /dev/xvdb
    Welcome to fdisk (util-linux 2.23.2).
    Changes will remain in memory only, until you decide to write them.
    Be careful before using the write command.
    Device does not contain a recognized partition table
    Building a new DOS disklabel with disk identifier 0xb3c6ea84.
    Command (m for help): n
    Partition type:
      p   primary (0 primary, 0 extended, 4 free)
      e   extended
    Select (default p): p
    Partition number (1-4, default 1):
    First sector (2048-4194303, default 2048):
    Using default value 2048
    Last sector, +sectors or +size{K,M,G} (2048-4194303, default 4194303):
    Using default value 4194303
    Partition 1 of type Linux and of size 2 GiB is set
    Command (m for help): w
    The partition table has been altered!
    Calling ioctl() to re-read partition table.
    Syncing disks.

    Run the partprobe command to ensure the partition table has been updated:

    # partprobe

    Create an ext4 filesystem on the /dev/xvdb1 partition:

    # mkfs -t ext4 /dev/xvdb1
  3. Challenge

    Create the Directory for the Mount Point and Change the Group to app

    # mkdir /app
  4. Challenge

    Configure /etc/fstab with the UUID of /dev/xvdb1, Mount the Filesystem, and change the group of the filesystem to app.

    Get the UUID for /dev/xvdb1:

    # blkid /dev/xvdb1
    /dev/xvdb1: UUID="d6a5691b-a045-463f-bf2b-74d0c71895e2" TYPE="ext4"

    Paste the UUID into the /etc/fstab file with the following options:

    # vim /etc/fstab
    UUID=d6a5691b-a045-463f-bf2b-74d0c71895e2       /app    ext4    defaults,grpquota       1       2

    Mount newly added filesytems configured in /etc/fstab:

    # mount -a

    Change the group of the /app filesystem to app:

    # chgrp app /app
  5. Challenge

    Install the quota Package, Create the Quota Files for the /app Filesystem, and Generate the Table of Current Disk Usage for Each Filesystem

    Install the quota package:

    yum install -y quota

    Create the quota files for the /app filesystem:

    quotacheck -cug /app

    Generate the table of current disk usage per filesystem:

    quotacheck -avug
  6. Challenge

    Assign a Soft Quota of 512 KB and a Hard Quota of 1M (1024KB) to the app Group, Then Turn Quotas on and Check the Group Quota Configuration for /app

    Assign a soft quota of 512 KB and a hard quota of 1M (1024KB) to the app group:

    $ edquota -g app
    Disk quotas for group app (gid 1004):
      Filesystem                   blocks       soft       hard     inodes     soft     hard
      /dev/xvdb1                        4        512       1024          1        0        0

    Turn quotas on for the filesystem:

    $ quotaon -vug /app

    Verify the group quota configuration for /app:

    $ repquota -g /app
    *** Report for group quotas on device /dev/xvdb1
    Block grace time: 7days; Inode grace time: 7days
                            Block limits                File limits
    Group           used    soft    hard  grace    used  soft  hard  grace
    root      --      16       0       0              1     0     0       
    app       --       4     512    1024              1     0     0       

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