Ubuntu system gives disk quota (Quota)

Requirements: disk quota for U disk, different usage capacity for different users

Step 1: install the quota command

Sudo apt-get install quota

Step 2: partition the USB disk. All the capacity is divided into one partition.

Sudo fdisk / dev/sdb

N-> p-> Enter- > w

Step 3: format the partition (ext3)

Sudo mkfs.ext3 / dev/sdb1

If you are required to enter information, just Enter (enter)

Step 4: Mount the partition / dev/sdb1

Sudo mkdir / mnt/quotadir

Sudo mount / dev/sdb1 / mnt/quotadir/

Mount | grep sdb1

Step 5: quota permissions for this directory

Sudo mount-o remount,usrquota,grpquota / mnt/quotadir/

Mount | grep sdb1

Step 6: create a quota record file and scan it with quotacheck.

Sudo quotacheck-avug

Step 7: turn the quota service on and off

Open: sudo quotaon-vug / mnt/quotadir/

Close: sudo quotaoff-vug / mnt/quotadir/

Step 8: create two users in the same group, and then set a space quota for these two users.

Sudo groupadd quotagroup

Cat / etc/group | grep quotagroup

Sudo useradd-g quotagroup quotauser1

Sudo useradd-g quotagroup quotauser2

Cat / etc/passwd | grep quota

Step 9: assign quotas to specified users or groups

Assign 250m quota to quotauser1, which cannot exceed 300M:sudo edquota-u quotauser1

Assign 250m quota to quotauser2, which cannot exceed 300M:sudo edquota-u quotauser2

In the same way, the second user wrote it himself.

Assign 500m quota to quotagroup group, which cannot exceed 600M:sudo edquota-g quotagroup

Set a grace period of 14 days: sudo edquota-t

Step 10: show the quota phenomenon of users or groups

Show user quota: sudo quota-uvs quotauser1 quotauser2

Show group quotas: sudo quota-gvs quotagroup

Step 11: display quota information for the file system

Display user: sudo repquota-auvs

Show group: sudo repquota-agvs

Step 12: test whether it is effective

Switch user: sudo su quotauser1

Create a large file: dd if=/dev/zero of=bigfile bs=1M count=270

Switch back to primary user view: sudo repquota-auvs

When writing again, an error will be reported, and only the capacity of the upper limit value can be written.

Over and out.