Ａ、磁盤配額作用限制普通用戶使用磁盤空間，不至于因?yàn)閭€(gè)別人的浪費(fèi)而影響到其它人的正常使用；<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

Ｂ、需要內(nèi)核的支持；

Ｃ、只有Ext2/Ext3文件系統(tǒng)目前支持這種功能；

Ｄ、需要用戶程序quota軟件包.
　　　　　　　　　　　　　　　　　磁盤配額配置過程

１）、使用usrquota，grpquota選項(xiàng)掛載一個(gè)分區(qū)，激活內(nèi)核的支持（只能在分區(qū)上做）

２）、方法：#mount –o usrquota,grpquota /dev/sdb1 /mnt/d1

或 mount –o remount,usrquota,grpquota / (因?yàn)楦夸浺呀?jīng)掛載過，可重新掛載)

３）、init 1 （進(jìn)入單用戶環(huán)境來配置）
４）、quotacheck –cvuga 檢查并創(chuàng)建磁盤配額的數(shù)據(jù)庫文件（存放位置：在每一個(gè)分區(qū)的根目錄下面）

-c： 創(chuàng)建create； –v：更詳細(xì)地表述；–u：用戶user；–g：組group；-a：所有all

５）、edquota –u 為指定用戶分配磁盤空間和節(jié)點(diǎn)數(shù)量

６）、quota命令可以查看用戶的配額使用情況

如：[root@localhost root]# ls /mnt

cdrom floppy

[root@localhost root]# mkfs.ext3 /dev/sdb1 /mnt/sd1/
mke2fs 1.32 (09-Nov-2002)

mkfs.ext3: bad blocks count - /mnt/sd1/

[root@localhost root]# mkfs.ext3 -f /dev/sdb1 /mnt/sd1/

[root@localhost root]# fdisk -l
Disk /dev/sda: 5368 MB, 5368709120 bytes

255 heads, 63 sectors/track, 652 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System

/dev/sda1 * 1 652 5237158+ 83 Linux

Disk /dev/sdb: 4294 MB, 4294967296 bytes

255 heads, 63 sectors/track, 522 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System

/dev/sdb1 250 522 2192872+ 83 Linux

[root@localhost root]# mkfs.ext3 /dev/sdb1
mke2fs 1.32 (09-Nov-2002)
Filesystem label=

OS type: Linux

Block size=4096 (log=2)

Fragment size=4096 (log=2)

274176 inodes, 548218 blocks

27410 blocks (5.00%) reserved for the super user

First data block=0
17 block groups

32768 blocks per group, 32768 fragments per group

16128 inodes per group

Superblock backups stored on blocks:

32768, 98304, 163840, 229376, 294912

Writing inode tables: done

Creating journal (8192 blocks): done

Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 30 mounts or

180 days, whichever comes first. Use tune2fs -c or -i to override.

[root@localhost root]# mount /dev/sdb1 /mnt/sd1 -o usrquota,grpquota
[root@localhost root]# mount

/dev/sda1 on / type ext3 (rw)

none on /proc type proc (rw)
usbdevfs on /proc/bus/usb type usbdevfs (rw)

none on /dev/pts type devpts (rw,gid=5,mode=620)
none on /dev/shm type tmpfs (rw)

/dev/sdb1 on /mnt/sd1 type ext3 (rw,usrquota,grpquota)

[root@localhost root]# more /etc/mtab

/dev/sda1 / ext3 rw 0 0

none /proc proc rw 0 0

usbdevfs /proc/bus/usb usbdevfs rw 0 0

none /dev/pts devpts rw,gid=5,mode=620 0 0

none /dev/shm tmpfs rw 0 0

/dev/sdb1 /mnt/sd1 ext3 rw,usrquota,grpquota 0 0

[root@localhost root]# quotacheck –cvuga <-------

quotacheck: Scanning /dev/sdb1 [/mnt/sd1] done
quotacheck: Checked 2 directories and 0 files

[root@localhost root]# ls /mnt/sd1/

aquota.group aquota.user lost+found

aquota.group 和aquota.user兩個(gè)數(shù)據(jù)文件，用來分配組和用戶的配額情況。

[root@localhost root]# quotaon 或reboot或quotaon /dev/sdb1

[root@localhost root]# edquota -u redhat

Disk quotas for user redhat (uid 502):

Filesystem blocks soft hard inodes soft hard

/dev/sdb1 125 10 0 80 0 10

注：blocks表示：塊的數(shù)量；inodes表示：節(jié)點(diǎn)的數(shù)量或建立文件的個(gè)數(shù)；
soft表示：軟限制，可以超過這個(gè)數(shù)值的設(shè)定，但是有天數(shù)限制；

hard表示：硬限制，這是一個(gè)任何時(shí)候也不能超過的數(shù)值，永遠(yuǎn)不可能達(dá)到。

[root@localhost root]# \ls /mnt/sd1

aquota.group aquota.user lost+found

[root@localhost root]# mkdir /mnt/sd1/redhat

[root@localhost root]# chown redhat /mnt/sd1/redhat/

[root@localhost root]# su - redhat

[redhat@localhost redhat]$ pwd

/home/redhat

[redhat@localhost redhat]$ cd /mnt/sd1/redhat/

[redhat@localhost redhat]$ pwd
/mnt/sd1/redhat

[redhat@localhost redhat]$ quota

Disk quotas for user redhat (uid 502):

Filesystem blocks quota limit grace files quota limit grace

/dev/sdb1 4 10 0 1 0 9

[redhat@localhost redhat]$ ls -lh

total 8.0K

drwxrwxr-x 2 redhat redhat 4.0K Mar 12 22:41 dir
drwxrwxr-x 2 redhat redhat 4.0K Mar 12 22:41 dir1

[redhat@localhost redhat]$ ls -ld

drwxr-xr-x 4 redhat root 4096 Mar 12 22:41 .

[redhat@localhost redhat]$ dd if=/dev/zero of=file1 bs=1k count=1024

1024+0 records in

1024+0 records out

[redhat@localhost redhat]$ quota -u redhat

Disk quotas for user redhat (uid 502):

Filesystem blocks quota limit grace files quota limit grace

/dev/sdb1 1040* 10 0 6days 4 0 9
[redhat@localhost redhat]$ touch file1

[redhat@localhost redhat]$ touch file2

[redhat@localhost redhat]$ touch file3

[redhat@localhost redhat]$ touch file4

[redhat@localhost redhat]$ touch file5

[redhat@localhost redhat]$ ls

file1 file2 file3 file4 file5
[redhat@localhost redhat]$ quota -u redhat

Disk quotas for user redhat (uid 502):

Filesystem blocks quota limit grace files quota limit grace

/dev/sdb1 1032* 10 0 6days 6 0 9
[redhat@localhost redhat]$ touch file6

[redhat@localhost redhat]$ touch file7

[redhat@localhost redhat]$ touch file8

[redhat@localhost redhat]$ touch file9

sd(8,17): write failed, user file limit reached.

touch: creating `file9': Disk quota exceeded

[redhat@localhost redhat]$ touch file10

touch: creating `file10': Disk quota exceeded
[redhat@localhost redhat]$ quota -u redhat

Disk quotas for user redhat (uid 502):

Filesystem blocks quota limit grace files quota limit grace

/dev/sdb1 1032* 10 0 6days 9* 0 9

[redhat@localhost redhat]$ cat /etc/fstab

LABEL=/ / ext3 defaults 1 1

none /dev/pts devpts gid=5,mode=620 0 0

none /proc proc defaults 0 0

none /dev/shm tmpfs defaults 0 0

/dev/cdrom /mnt/cdrom udf,iso9660 noauto,owner,kudzu,ro 0 0
/dev/fd0 /mnt/floppy auto noauto,owner,kudzu 0 0

/dev/sdb5 /mnt/sdb5 ext3 defaults 0 0

[root@localhost root]# repquota -a

*** Report for user quotas on device /dev/sdb1

Block grace time: 7days; Inode grace time: 7days

Block limits File limits
User used soft hard grace used soft hard grace

----------------------------------------------------------------------

root -- 20 0 0 2 0 0

redhat +- 1032 10 0 7days 9 0 9

#quotaoff /mnt/sdb1

#edquota –u redhat
如果要永久用配額限制的話，可以手動(dòng)編輯/etc/fstab 增加：

/dev/sdb1 /mnt/sb1 ext3 defaults,usrquota,grpquota 0 0

保存退出！

取消磁盤配額的方法：

1）、使用命令quotaoff –a 關(guān)閉對(duì)應(yīng)磁盤分區(qū)上的配額文件 2）、可編輯/etc/fstab文件 3）、刪除/mnt/sd1目錄下的aquota.usr、aquota.group兩個(gè)數(shù)據(jù)庫文件.

轉(zhuǎn)載于:https://blog.51cto.com/tzsky/237305

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