Experimental environment

Environment: CentOS 7.3, a disk SDB is divided into a partition sdb1.

Install disk quota support software

yum install quota

Make a file system and mount it in a way that supports quota functions

mkfs.ext4 /dev/sdb1
mount /dev/sdb1 /tmp
mount -o remount,usrquota,grpquota /dev/sdb1

Check whether disk quota technology is enabled when disk is mounted

mount
 To mount permanently (add usrquota,grpquota to the configuration file)
vim /etc/fstab
/dev/sdb1	/tmp	ext4	defaults,usrquota,grpquota	0 0

Detect disk quotas and generate quota files (close se if error occurs) linux)

quotacheck -cugv /tmp		#This command generates two files under / tmp
#Interpretation: - c Create quota file, - u (- g) scan disk space, calculate the number of directories and files occupied by each user (group) identification code, - a scan in / etc/fstab file, there are partitions added quota settings, - d shows the instruction execution process in detail, so as to facilitate error removal. - R. Exclude the partition where the root directory is located

Quota Settings for User and Group Accounts

useradd wsfnk		#Create a user first, and if you have one, you don't need to create one.
edquota -u wsfnk	#- g Represents the wsfnk group, where editing limits are limited in a vim-like interface.

Disk quotas for user wsfnk (uid 1000):
  Filesystem                   blocks       soft       hard     inodes     soft     hard
  /dev/sdb1                         0          20         50          1        0        0

#The fields are explained as follows:
	#Filesystem displays partitions that implement disk quotas.
	#blocks for the size of the current use, do not need to modify;
	#Soft is a soft limit, which will give a warning when exceeded, and the excess part will be saved for 7 days by default.
	#Hard is a hard restriction, which can not be exceeded (the default units of hard and soft restrictions are KB);
	#The latter two identical soft and hard represent the soft and hard limits on the number of files that the user can create in the partition.
	#In this example, qingsword can use the soft limit size of / dev/sdb1 partition 10KB, hard limit 20KB, the number of files can be created soft limit is 3, hard limit 5;

edquota parameter
	-u		: Setting up user's quta，This is the preset parameter.
	-g		: Set group's quota
	-p Source User Name	: The source user's quota Settings apply to other users or groups
	-t		: Setting grace period

Activate disk quotas

quotaon -ugv /tmp

Note: Blocks in disk quotas are not blocks seen in fdisk, but represent 1k

Test whether restrictions will take effect

Writing data
mkdir /tmp/test
chmod 777 /tmp/test

//Handover user wsfnk
su wsfnk
cd /tmp/test
dd if=/dev/zero of=wss.test bs=1k count=500

Close disk quotas

#Close disk quotas for individual disks
quotaoff /sdb1

#Close all open disk quotas
quotaoff -a

#Conversely, open all disk quotas
quotaon -a

#If you no longer use disk quotas, you can delete the configuration files as well.
rm -rf /sdb1/aquota.*

#Finally, delete the automatic mount in / etc/fstab