Poster of Linux kernelThe best gift for a Linux geek


Section: Containers (8) Updated: Mar 06, 2008
Local index Up


vzquota - manipulate containers disk quotas  


vzquota [quota_options] command quota_id [command_options]  


vzquota controls disk quotas for Virtuozzo/OpenVZ container. These are per-container disk quotas set from Virtuozzo/OpenVZ host system.

The quota_id must be numeric-only identifier. Note, that quota ID is not the same as container ID (CTID). One container can mount several filesystems and each of them can have its own quotas.  


Argument command can be one of the following: init, drop, on, off, setlimit, setlimit2, stat, show.  


Print usage information.
Print utility version.
Quiet mode. Causes all warning and diagnostic messages to be suppressed. Only fatal errors are displayed.
Verbose mode. Causes vzquota to print debugging messages about its progress. Multiple -v options increase verbosity. Maximum is 2.
Batch mode. in this mode outputs (usually on stat and show commands) will be in format better suitable for parsing by a script.

Quota Commands

The following commands are available:
A necessary preliminary for any other quota command work: create a new quota file, calculating current disk usage from given path. This command requires full set of quota soft- and hardlimits given as command-line options. Limits are also stored in quota file, so subsequent vzquota on doesn't requires any quota limit as command-line parameter, although accepts them as well. New specified limits and flags will also be stored in the quota file.

You can also create your own quota files for arbitrary quota accounting points. Quota file location and path to quota accounting point can be specified via -c and -p options (see below). You can use also -R option instead of -c option, to set relative quota file location. In this case quota file resides one dirrectory upper than quota accounting point and has special name (see below).

Remove quota file. Command checks if quota is running and refuses to remove file in this case, option -f allows to override that rule.
Turn quota on. If previous quota session wasn't switched off properly (quota is not running, but quota file indicates it is), initialization procedure will be performed. -f option allow to force initialization procedure regardless of the shutdown status. Command on doesn't work in case specified quota id is running.
Turn quota off, write usage statistic back to the quota file. Doesn't work if quota file cannot be accessed, also accepts -f option (force switching off, even if usage statistic will be lost). This is possible that quota will still be in a stopped state, even if -f flag is used.
Set new quota parameters. Requires at least one quota parameter or flag specified. Applies new parameters immediately if quota with given quota_id is running. Stores new limits and flags in the quota file. Option -f specifies to mark quota as dirty, so at the next quota start, disk will be rescanned and usage updated.
Set second-level quota parameters. Applies new parameters immediately if quota with given quota_id is running and second-level quota is on. Stores new limits in the quota file.
Show usage statistics and update it in quota file. Option -f causes to do not read and update quota file, just print statistics from kernel. Option -t specifies to show and update user/group based quota statistics for a container. Works on running containers only. The command with -t option flushes all quota statistics from kernel to file and thus may be used for backup purposes.
Show usage and limits info from quota file. Option -t specifies to show user/group quota information as well.

Quota Command Options

Quota limits and flags.
All these options are required in init command, and optionally accepted in on and setlimit commands.
-s, --sub-quotas 1|0
Enables or disables user/group based quota inside the container. Here 1 means to enable, and 0 - to disable. By default user/group quota is disabled. This option is accepted by init and on commands.
-u user_id
For setlimit2 command only. Limits will be applied to the specified user_id.
-g group_id
For setlimit2 command only. Limits will be applied to the specified group_id.
-u, --ugid-limit limit
For on and setlimit commands only. Specifies maximum number of user and group IDs allowed in the container. If the value is 0, user/group quota will not be accounted. Default value is 0. There is one note concerning setlimit command. If first-level quota is running, second-level quota is active and not all ugid objects were loaded into kernel by on command due to insufficient ugid_limit value (this can be checked by issuing stat -t command and observing whether ugid limit was exceeded), then setlimit with new limit value updates it in kernel and file but this change does not take immediate effect. Modification will be applied after quota restart.
-b, --block-softlimit bsl
Disk quota block soft limit. Soft limit is amount of blocks which excess is allowed in time equal exptime. On the expiration of this time soft limit becomes hard limit. Block limits are set in 1k sized blocks.
-B, --block-hardlimit bhl
Disk quota block hard limit. Hard limit is amount of blocks which excess is not allowed.
-e, --block-exptime bet
Disk quota expiration time for excess of a block soft limit. Time can be given in two different formats:
1. dd:hh:mm:ss
For instance: 30 - 30 seconds; 12:00 - 12 minutes; 20:15:11:00 - 20 days, 15 hours, 11 minutes
2. xxA, where A - h/H(hour); d/D(day); w/W(week); m/M(month); y/Y(year).
For instance: 7D - 7 days; 01w - 1 week; 3m - 3 months
-i, --inode-softlimit isl
Disk quota inode soft limit. Similarly to block soft limit.
-I, --inode-hardlimit ihl
Disk quota inode hard limit.
-n, --inode-exptime iet
Disk quota expiration time for excess of a inode soft limit.
Quota options.

-p path
Point of quota accounting for given quota_id. This option required for init command and can be used also with any another command to override quota path obtained from quota file. For on and setlimit commands, this option can be used to set and save new quota accounting path for given quota_id
Set special relative path to quota_file. If this option is specified, quota file location will depends on path to quota accounting dir: if your quota accounting path is /path/to/somewhere/ than quota file will be /path/to/quota.somewhere. If this option is not specified, quota file location is /var/lib/vzquota/quota.quota_id. All commands accept this option.
-c quota_file
This option allows to specify a quota_file to work with. All commands accept this option. If this option is not specified, default file location depends on whether -R option is specified or not (see above).
Force option. Accepted by drop, on, off, stat, setlimit and setlimit2 commands. Action of this option differs for different commands and is described above for each command separately.
For stat and show commands only. Processes user/group quota statistics. Specifies whether to show (update in file) user/group quota information.
For setlimit2 command. Set second-level quota time grace parameters.


It is impossible to start or stop quota accounting if the directory given by -p option is busy. This is rather limitation of kernel part of disk quota implementation.  


vzquota stat and vzquota show display the following information:

resource - 1k-blocks or inodes.

usage - current usage of resource.

softlimit - resource limit. Current usage can exceed this limit up to hard limit during grace time.

hardlimit - resource limit. Current usage can't exceed this limit.

grace - during this amount of time usage can exceed softlimit. If a soft limit has not been exceeded the grace column is blank. If the grace period has expired, the grace column contain special none value.

If -t is specified the following information is displayed also:

User/group quota - on|off, active|inactive. Status of the 2nd level quota. on|off defines the state of the 2nd level quota at the next start of container quota. active|inactive indicates the current state of the 2nd level quota in kernel.

Ugids - loaded, total and limit. loaded is number of records (uids or gids) in kernel. total is number of unique records located in the kernel and quota file. limit is current kernel limits of records amount. loaded and total may be greater then limit.

Ugid limit was exceeded - yes or no. Yes indicates that vzquota did not loaded all records in kernel. In this case you should reduce number of unique records (remove files which belong to unnecessary users) or increase limit. After that you should restart quota.

User/group grace times and quotafile flags - during grace time usage can exceed softlimit. Quotafile flags are internal parameters of standard linux kernel quota v.3.



Command executed successfully
System error
Usage error
Virtuozzo syscall error
Quota file error
Quota is already running
Quota is not running
Can not get lock on this quota id
Directory tree crosses mount points
Quota is running but user/group quota is inactive; this status is returned by stat -t command for information purposes and does not indicate a error
Quota is marked as dirty in file; this status is returned by show command for information purposes and does not indicate a error
Quota file does not exist
Internal error
Can't obtain mount point


Copyright (C) 2000-2008, Parallels, Inc. Licensed under GNU GPL.



Quota Commands
Quota Command Options

This document was created by man2html, using the manual pages.
Time: 22:02:37 GMT, April 16, 2011