How to implement file system quota under Linux system

1. Quotas, also known as limits, are for partitions, not users or files, and not the entire hard disk;
2. Kernel version must be more than 2.4 to support; see if the kernel supports quotas.
3.root is not restricted by quota, only ordinary users are restricted;
4. Terminology in quotas:
<1> Soft limit: warning limit, can be broken;
<2> Hard limit: Maximum available limit, no breakthrough;
<3> Quota Size: In the size of K units, the number of files in units;
<4> Quota Grace Date: Reduce the hard limit back to the soft limit of the grace time;
5. Quotas can be set for users or groups, respectively, as:
User quota: Usrquota
Set quotas for individual users;
Group Quota: Grpquota
Set quotas for all members in the entire group;
6. Steps for configuring quotas:
<1> #vi/etc/fstab #系统启动时, file systems and partitions that need to be mounted
To mount the/home partition, enable the quota feature and modify the following:
<2> #mount-o remount/home #重新卸载再挂载做配额的分区
#cat/etc/mtab #查看已经挂载的分区是否启用磁盘配额功能
Note:/etc/mtab This file is a partition that has been mounted after system startup.
<3> Quota detection: Detect quotas in the system, create quota files under partitions and write system quota information;
#useradd US1
#quotacheck-cavug
#ll/home #查看/home generates two quota database files
<4> Edit the quota size for a user or group
#edquota-U US1
#edquota-G US1
<5> viewing user and group quota reports
#repquota –a
#repquota-ag
<6> Enable quota feature
#quotaon –avug
<7> Test users ' quotas
#su-US1//Toggle Normal User test user quotas
$CP/bin/*/home/us1//Copy file test quota limit effect
#repquota-A//view quota report
<8> Check that the current directory size is used
#du-H
<9> Modify the grace time of a quota (for the entire partition, the time unit can be days, hours, minutes, seconds)
#edquota-T
<10> quota replication (multiple target users can be specified at the same time)
#edquota-P US1 US2 US3 US4 US5

Let's show you how to implement file system quotas on Linux systems

Create a disk partition/DEV/SDB1

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To see if the partition was created successfully and synchronized

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Formatting/DEV/SDB1 partitions

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Create a/mnt/home temporary mount point

Mount the/DEV/SDB1 under/mnt/home

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Migrating/home data to the/mnt/home directory

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Mount the/DEV/SDB1 partition to the/home directory

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Temporary mount point prior to uninstallation/mnt/home

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Modify the configuration file to automatically mount the boot

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Modify the Fstab file to add Mount options Usrquota,grpquota

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Re-mount to make it effective

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Create a quota database

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To see if the quota database is enabled

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Enable the Quota database

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Set User Wangcai disk quotas

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View disk quotas for user Wangcai

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To view disk quotas on a partition

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Note: If the following error occurs when you create the quota database

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You can use the following methods to resolve

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How to implement file system quota under Linux system