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Managing Resources 49

Turning On and Off Per-VPS Disk Quotas

The parameter that defines whether to use first-level disk quotas is DISK_QUOTA in the

OpenVZ global configuration file (

/etc/sysconfig/vz). By setting it to “no”, you will

disable OpenVZ quotas completely.

This parameter can be specified in the Virtual Private Server configuration file

(

/etc/sysconfig/vz-scripts/vpsid.conf) as well. In this case its value will take

precedence of the one specified in the global configuration file. If you intend to have a mixture

of Virtual Private Servers with quotas turned on and off, it is recommended to set the

DISK_QUOTA value to “yes” in the global configuration file and to “no” in the configuration

file of that VPS which does not need quotas.

The session below illustrates a scenario when first-level quotas are on by default and are turned

off for Virtual Private Server 101:

[checking that quota is on]

# grep DISK_QUOTA /etc/sysconfig/vz

DISK_QUOTA=yes

[checking available space on /vz partition]

# df /vz

Filesystem 1k-blocks Used Available Use% Mounted on

/dev/sda2 8957295 1421982 7023242 17% /vz

[editing VPS configuration file to add DISK_QUOTA=no]

# vi /etc/sysconfig/vz-scripts/101.conf

[checking that quota is off for VPS 101]

# grep DISK_QUOTA /etc/sysconfig/vz-scripts/101.conf

DISK_QUOTA=no

# vzctl start 101

Starting VPS ...

VPS is mounted

Adding IP address(es): 192.168.1.101

Hostname for VPS set: vps101.my.org

VPS start in progress...

# vzctl exec 101 df

Filesystem 1k-blocks Used Available Use% Mounted on

simfs 8282373 747060 7023242 10% /

As the above example shows, the only disk space limit a Virtual Private Server with the quotas

turned off has is the available space and inodes on the partition where the VPS private area

resides.

Note: You must change the DISK_QUOTA parameter in the global OpenVZ configuration file

only when all Virtual Private Servers are stopped, and in the VPS configuration file – only when

the corresponding VPS is stopped. Otherwise, the configuration may prove inconsistent with the

real quota usage, and this can interfere with the normal Hardware Node operation.

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Virtuozzo SWsoft OpenVZ Guida Utente Pagina 49