Linux disk quota settings and usage

Concept

Limit the use of disk space for a user or a group

Conditions to implement disk quotas

Requires Linux kernel support

Installing the Quota Package

Features of Linux disk quotas

Scope: For the specified file system (partition)

Restricted objects: User accounts, group accounts

Restriction type:

Disk capacity (default is KB)

Number of files (node)

Restriction method:

Soft limit (out of range, can write, write will give warning)

Hard limit (out of range, cannot write)

Soft limit <= Hard limit

Experimental steps

⑴ Partitioning, formatting

[Email protected] ~]# Fdisk/dev/sdb

[Email protected] ~]# fdisk-l/DEV/SDB1

[Email protected] ~]# MKFS.EXT4/DEV/SDB1 #格式化分区

⑵ Close SELinux

[[email protected] ~]# Setenforce 0 #临时关闭seliux, otherwise quotacheck can not create the corresponding configuration file

⑶ writing automatic mount files

[[email protected] ~]# mkdir/mnt/sdb1# set up mount point

[Email protected] ~]# Vim/etc/fstab #编辑开机自动挂载配置文件

[[email protected] ~]# mount-a# automatically mount/etc/fstab file contents

[Email protected] ~]# df-h

[[email protected] ~]# chmod 777/mnt/sdb1/#修改挂载点目录 for easy testing

[Email protected] ~]# ll-d/mnt/sdb1/drwxrwxrwx. 3 root root 4096 June 05:59/mnt/sdb1/

⑷ detecting disk quotas and creating quota files

[Email protected] ~]# QUOTACHECK-CVUG/MNT/SDB1

-U,-G: Detect user, Group quotas

-C: Create a quota data file

-V: Displays execution process information

-A: detects all available partitions

[Email protected] ~]# ls/mnt/sdb1/#查看配置文件是否存在

⑸ Add users, edit quota settings for user or group accounts

[Email protected] ~]# useradd-u Lisi #添加lisi用户

[Email protected] ~]# passwd Lisi

[Email protected] ~]# edquota-u Lisi #针对lisi用户编辑配额设置

⑹ to turn on the file system quota function

[Email protected] ~]# quotaon-ugv/mnt/sdb1/

-A open in the/ect/fstab file, there is a space limit for the partition that joins the quota setting

-G Open Group disk space limit

-U open User's disk space limit

-V Show Instruction execution process

⑺ Switch User, write data test

[Email protected] ~]# Su-lisi #切换李四用户写入数据

① Test capacity limits

[[email protected] ~]$ dd If=/dev/zero of=/mnt/sdb1/myfile1.txt bs=10k count=40 #将无限制的产生0的数据写到myfile1. txt, simulation produces data

② Test node limits

[Email protected] ~]$ rm-rf/mnt/sdb1/my* #删除之前测试数据

[Email protected] ~]$ cd/mnt/sdb1/

[email protected] sdb1]$ touch A1 A2 A3 A4 A5

[email protected] sdb1]$ touch a6

Linux disk quota settings and usage