Parallels Virtuozzo Containers for Windows

Transcription

1 Parallels Parallels Virtuozzo Containers for Windows Reference Guide Version 4.0 Copyright Parallels Software International Inc.

2 ISBN: N/A Parallels Holdings Ltd Sunrise Valley Drive Suite 600 Herndon, VA USA Tel: +1 (703) Fax: +1 (703) Parallels Holdings Ltd. All rights reserved. Distribution of this work or derivative of this work in any form is prohibited unless prior written permission is obtained from the copyright holder.

3 3 Contents Preface 5 About Parallels Virtuozzo Containers... 6 About This Guide... 7 Organization of This Guide... 7 Documentation Conventions... 8 Getting Help... 9 Feedback Configuring Parallels Virtuozzo Containers 11 Configuring Containers Adding Custom Action Scripts Parallels Virtuozzo Command Line Interface 16 vzctl vzctl create vzctl delete and vzctl destroy vzctl mount and vzctl umount vzctl start, vzctl stop, vzctl restart, and vzctl status vzctl set vzctl exec, vzctl exec2, and vzctl enter vzctl mountext and vzctl umountext vzctl partadd and vzctl partdel vzctl reinstall vzctl shrink vzlist vzlist Output Parameters and Their Specifiers vzquota vzquota setlimit vzquota stat and vzquota show Licensing Utilities vzlicload vzlicview Migration Utilities vzmigrate vzp2v vzmlocal Backing-Up Utilities vzabackup vzarestore vzvssctl Template Management Utilities vzpkgls vzpkgdeploy vzpkgadd vzpkgrm Supplementary Tools vzsveinstall vzkeygen... 47

4 Contents 4 vzcache vzlscache vzuncache vznetcfg vznetstat Glossary 52 Index 54

5 5 C HAPTER 1 Preface In This Chapter About Parallels Virtuozzo Containers... 6 About This Guide... 7 Getting Help... 9 Feedback... 10

6 Preface 6 About Parallels Virtuozzo Containers Parallels Virtuozzo Containers is a patented OS virtualization solution. Virtuozzo Containers 4.0 creates isolated partitions or Containers on a single physical server and OS instance to utilize hardware, software, data center and management effort with maximum efficiency. The basic Virtuozzo capabilities are: Intelligent Partitioning - Division of a server into as many as hundreds of Containers with full server functionality. Complete Isolation - Containers are secure and have full functional, fault and performance isolation. Dynamic Resource Allocation - CPU, memory, network, disk and I/O can be changed without rebooting. Mass Management - Suite of tools and templates for automated, multi-container and multi-server administration. The diagram below represents a typical model of the Virtuozzo-based system structure: Figure 1: Virtuozzo Containers OS Virtualization

7 Preface 7 The Parallels Virtuozzo OS virtualization model is streamlined for the best performance, management, and efficiency. At the base resides a standard Host operating system which can be either Windows or Linux. Next is the virtualization layer with a proprietary file system and a kernel service abstraction layer that ensure the isolation and security of resources between different Containers. The virtualization layer makes each Container appear as a standalone server. Finally, the Container itself houses the application or workload. The Parallels Virtuozzo OS virtualization solution has the highest efficiency and manageability making it the best solution for organizations concerned with containing the IT infrastructure and maximizing the resource utilization. The Parallels Virtuozzo complete set of management tools and unique architecture makes it the perfect solution for easily maintaining, monitoring, and managing virtualized server resources for consolidation and business continuity configurations. About This Guide This guide is a complete reference on all Parallels Virtuozzo Containers configuration files and Hardware Node command-line utilities. It familiarizes you with the way to configure Virtuozzo Containers 4.0 to meet your requirements and to perform various tasks by using the corresponding Virtuozzo command line utilities. The primary audience for this guide is anyone who is looking for an explanation of a particular configuration option, does not understand a Virtuozzo file format, needs help for a particular command, or is seeking for a command to perform a certain task. Organization of This Guide Chapter 2, Configuring Parallels Virtuozzo Containers, explains how to configure Parallels Virtuozzo configuration files and to use custom action scripts to make your Containers function more effectively. Chapter 3, Parallels Virtuozzo Command Line Interface, describes all available Hardware Node command-line utilities together with the options and switches that can be passed to them.

8 Preface 8 Documentation Conventions Before you start using this guide, it is important to understand the documentation conventions used in it. For information on specialized terms used in the documentation, see the glossary at the end of this document. Typographical Conventions The following kinds of formatting in the text identify special information. Formatting convention Preformatted Preformatted Bold Moonscape Monospace Italics Special Bold Italics Type of Information On-screen computer output in your command-line sessions; source code in XML, C++, or other programming languages. What you type, as contrasted with onscreen computer output. The names of commands, files, and directories. Designates a command line placeholder, which is to be replaced with a real name or value. All elements of the graphical user interface (GUI): menu items, menu options, menu buttons, etc. Titles of chapters, sections, and subsections. Used to emphasize the importance of a point or to introduce a term. Example Saved parameters for Container 101 C:\Documents and Settings\Administrator> vzlist Use vzctl start to start a Container. To delete a Container, type vzctl delete CT_ID. Go to the Resources tab. Read the Basic Administration chapter. CAPITALS Names of keys on the keyboard. SHIFT, CTRL, ALT KEY+KEY Key combinations for which the user must press and hold down one key and then press another. CTRL+P, ALT+F4 General Conventions Be aware of the following conventions used in this book. Host Operating System is an operating system installed on the Hardware Node. Chapters in this guide are divided into sections, which, in turn, are subdivided into subsections. For example, Documentation Conventions is a section, and General Conventions is a subsection. When following steps or using examples, be sure to type double-quotes (") and singlequotes (') exactly as shown.

9 Preface 9 Getting Help In addition to this guide, there are a number of other resources shipped with Virtuozzo Containers 4.0 which can help you use the product more effectively. These resources include: Manuals: Parallels Virtuozzo Containers Evaluation Guide. This guide is destined to introduce you to the main features of Virtuozzo Containers 4.0 and to its underlying technology, to help you set up an environment for evaluating the Parallels Virtuozzo major features, and to suggest the relevant procedures for this evaluation. Getting Started With Parallels Virtuozzo Containers for Windows. This guide provides basic information on how to install Parallels Virtuozzo Containers 4.0 on your server, create new Containers, and perform main operations on them. As distinct from the given guide, it does not contain detailed description of all the operations needed to install and set Parallels Virtuozzo to work (e.g. planning the structure of your Virtuozzo network or performing the Virtuozzo Containers unattended installation). Parallels Virtuozzo Containers for Windows Installation Guide. This guide provides exhaustive information on the process of installing, configuring, and deploying your Virtuozzo system. As distinct from the given guide, it contains a more detailed description of all the operations needed to install and set Virtuozzo Containers 4.0 to work including planning the structure of your Virtuozzo network, performing the Virtuozzo Containers unattended installation, etc. Besides, it does not include the description of any Container-related operations. Parallels Virtuozzo Containers for Windows User's Guide. This guide provides comprehensive information on Virtuozzo Containers 4.0 covering the necessary theoretical conceptions as well as all practical aspects of working with Parallels Virtuozzo Containers. However, it does not deal with the process of installing and configuring your Virtuozzo system. Parallels Virtuozzo for Windows Templates Management Guide. This guide is meant to provide complete information on Virtuozzo templates - an exclusive Parallels Virtuozzo technology allowing you to efficiently deploy standard Windows applications inside your Containers and to greatly save the Hardware Node resources (physical memory, disk space, etc.). Help systems: Parallels Management Console Help. This help system provides detailed information on Parallels Management Console - a graphical user interface tool for managing Virtuozzo Hardware Nodes and their Containers. Parallels Infrastructure Manager Online Help. This help system shows you how to work with Parallels Infrastructure Manager - a tool providing you with the ability to manage Virtuozzo Hardware Nodes and their Containers with the help of a standard Web browser on any platform. Parallels Power Panel Online Help. This help system deals with Parallels Power Panel - a means for administering individual Containers thru a common Web browser on any platform.

10 Preface 10 Feedback If you spot a typo in this guide, or if you have thought of a way to make this guide better, we would love to hear from you! The Parallels documentation forum is the ideal place for your comments and suggestions. It is regularly monitored by the members of the Parallels technical documentation department, so it is likely that you will receive a reply to your post before long. Note that new users will be asked to fill in a short registration form before being able to post. Registering will allow you to participate not only in the documentation forum discussions, but in all the other Parallels forums as well.

11 11 C HAPTER 2 Configuring Parallels Virtuozzo Containers This chapter provides information on the Parallels Virtuozzo configuration parameters. Besides, it explains how you can use your own custom action scripts to configure your Containers. In This Chapter Configuring Containers Adding Custom Action Scripts Configuring Containers Each Container has its own configuration file which is stored in the X:\vz\Conf\ folder and has a name of CT_ID.conf. The parameters in the X:\vz\Conf\<CT_ID>.conf file are presented in the form of the PARAMETER="value" pattern. The main parameters defining the Container configuration can be subdivided into the following categories: miscellaneous, resource management, and networking parameters. Note: During the Virtuozzo Containers installation, the Conf subfolder is automatically created in the folder you specified for storing all Container configuration files. By default, the C:\vz\ folder is used. However, you might have defined another path for this folder. Miscellaneous parameters: Parameter Description Default value VzPrivate The path to the Container private area. You C:\vz\private\ specify the location of the Container private area by passing the --private path argument to the vzctl create command. This parameter is omitted if the Container private area is located in the C:\vz\private\ directory. GUID The pseudo-random number used to uniquely identify the Container. GUIDs (Globally Unique - Identifiers) are written using a four-byte word, 3 two-byte words, and a six-byte word, such as: {3F2504E0-4F89-11D3-9A0C- 0305E82C3301}

12 Configuring Parallels Virtuozzo Containers 12 Autoboot OfflineMgmt OfflineServices TEMPLATE TEMPLATES WindowsDir DISKTYPE Specifies whether the Container should be started automatically on system startup. Virtuozzo automatically starts all Containers that have this value set to 1. Specifies whether the Container can be managed by the Container administrator using the offline services indicated in the OfflineServices parameter in this file provided the OfflineMgmt parameter in the C:\vz\Conf\0.conf file is set to "1". Overrides the OfflineServices parameter from the C:\vz\Conf\0.conf file. The services enumerated in this parameter can be used by the Container administrator for managing Containers, if the OfflineMgmt parameter in the C:\vz\Conf\0.conf file is set to "1". This is the name of the OS template the Container is based upon. Provides a list of application templates. You are not recommended to modify this parameter since it is used to track the history of the added templates. This parameter is omitted if no templates have been added to the Container. The path to the folder where the Windows Server 2003 system files for the given Container are located. In the current version of Virtuozzo, you cannot change the default path set during the Container creation. The type of the Container virtual disk drive. You can set the disk type to one of the following: plain: in this case the size of a virtual hard disk is fixed, i.e. all disk space is allocated during the virtual disk creation. sparse: in this case the size of a virtual hard disk is also fixed and disk space is allocated during the disk creation. However, an.efd file corresponding to a virtual hard disk can be regarded as a standard NTFS file supporting the 'sparse file' functionality. When the 'sparse file' functionality is enabled, the Host OS does not allocate hard drive space to an.efd file except in regions where it contains non-zero data. This allows you to make the disk space usage inside your Containers more efficient. compact: in this case you set only the maximal size of a virtual hard disk. A Container hard disk grows in size each time new data is written to the hard disk and can increase as large as the maximum size specified during the hard disk creation w2k3 - C:\WINDOWS plain

13 Configuring Parallels Virtuozzo Containers 13 Resource management parameters control the amount of resources a Container can consume. All resources are described in the Managing Resources chapter of the Parallels Virtuozzo Containers User's Guide in detail; here is only a list of parameters that can be found in the C:\vz\Conf\<CT_ID>.conf file: Parameter DiskQuota CpuUnits ProcessCountLi mit SessionCountLi mit CommittedMemor ylimit NetAllowBroadc asts NetQoSPacketSc heduler Description The total size of disk space that can be consumed by the Container, in 1-Kb blocks. The positive integer number that defines how much CPU time one Container will receive in comparison with the other Containers on the Hardware Node in case all the CPUs of the Node are fully used. The maximal number of processes the Container may create. Upon hitting this limit, the Container will not be able to start a new process or thread. The number of terminal sessions. This parameter is used to limit the number of simultaneous terminal sessions, i.e. the number of users that are allowed to connect to the Container at the same time thru MS TSC, RDP, etc. The size of private (or potentially private) memory that can be allocated by the Container, in bytes. The memory that is always shared among different applications is not included in this resource parameter. Setting this parameter to "1" enables the network browsing for the Container. The network browsing, if enabled, allows the Container administrator to view all the network servers and file sharing resources available on the Microsoft Windows network. By default, the network browsing is disabled. You can enable this feature for all Containers on your Node at once by setting this parameter to "1" in the C:\vz\Conf\0.conf file. Setting this parameter to "1" enables the Windows QoS packet scheduler for the Container. The QoS packet scheduler is used to regulate how much traffic an application inside your Container is allowed, thus enforcing the QoS parameters originally set for a particular application. By default, the QoS packet scheduler is disabled. Note: In case you have enabled the QoS packet scheduler for a running Container, you should restart this Container for the changes to take effect. CpuLimit The positive number indicating the CPU time, in percent, the corresponding Container is not allowed to exceed. By default, this parameter is disabled for all Containers on the Hardware Node, i.e. any application inside any Container can use all the free CPU power of the Node. Network-related parameters allow you to set a hostname, an IP address, and a network mask for the given Container: Parameter Hostname IP IPMASK Description Specifies the hostname of the Container. Sets an IP address for the Container. Several IP addresses per Container are allowed; in this case they should be divided by the semicolon and a space. The network mask of the Container. It should be the same for all the Containers located on a specific physical network segment.

14 Configuring Parallels Virtuozzo Containers 14 VeMac The MAC address to be assigned to the Container. A new MAC address should be specified in the form of "XX-XX-XX-XX-XX-XX" (e.g. VeMac="00-AA-BB-CC-DD-EE"). Note: You can change MAC addresses for stopped Containers only. Adding Custom Action Scripts ContainerVirtuozzo allows you to write and execute your own scripts on the Hardware Node to do additional actions when certain Container-related operations are performed. There are two kinds of scripts you can specify for execution on the Node or in the Container context: Preoperation scripts. These scripts are executed before some action is performed. They should be specified in the form of the vz-pre<action_name>.<ext> pattern, where <action_name> denotes the name of the operation to be performed (e.g. start), and <ext> is the extension of the file containing the script. Currently, the files with the.exe,.cmd,.bat,.vbs extensions are supported. Postoperation scripts. These scripts are executed after some action has been successfully completed. They should be specified in the form of the vzpost<action_name>.<ext> pattern where <action_name> denotes the name of the operation to be performed (e.g. stop), and <ext> is the extension of the file containing the script. Currently, the files with the.exe,.cmd,.bat,.vbs extensions are supported. The names of all possible scripts that may be specified for executing before or after performing an operation are listed in the table below: Script Name vz-precreate.<ext> vz-postcreate.<ext> vz-premount.<ext> vz-postmount.<ext> vz-preunmount.<ext> vz-postmount.<ext> vz-prestart.<ext> vz-poststart.<ext> vz-prestop.<ext> vz-poststop.<ext> vz-preclone.<ext> vz-postclone.<ext> vz-prechangevpsid.<ext> Description This script is to be run before the Container creation. This script is to be run after the Container creation. This script is to be run before mounting the Container private area. This script is to be run after mounting the Container private area. This script is to be run before unmounting the Container private area. This script is to be run after unmounting the Container private area. This script is to be run before the Container start. This script is to be run after the Container start. This script is to be run before stopping the Container. This script is to be run after stopping the Container. This script is to be run before copying the Container. This script is to be run after copying the Container. This script is to be run before changing the Container ID.

15 Configuring Parallels Virtuozzo Containers 15 vz-postchangevpsid.<ext> This script is to be run after changing the Container ID. Note: All the scripts are executed in the Host OS context. You may specify scripts that will be applied to all Containers residing on the Hardware Node. To this effect, you should place your script to the C:\vz\Scripts\. In its turn, locating a script to the C:\vz\private\CT_ID\scripts\ directory allows you to set this script for executing in the given Container only (per-container script). In the latter case, you may need to create the C:\vz\private\CT_ID\scripts\ directory manually since it is not created by creating a Container. When executed, any script takes only one parameter - the ID of the corresponding Container. Note: During the Virtuozzo Containers installation, the Scripts subdirectory is automatically created in the directory you specified for storing all Container configuration files. By default, the C:\vz\ directory is used. However, you might have defined another path for the directory. Let us assume you have created Container 101 with the private area located in the C:\vz\Private\101\ directory. And now you wish to write a script that will be executed each time after the Container start and display the number of events currently recorded in the Container System event log. To this effect, you should open Notepad or another text editor and write the following script code: strcomputer = "." Set objwmiservice = GetObject("winmgmts:" _ & "{impersonationlevel=impersonate}!\\" & strcomputer & "\root\cimv2") Set collogfiles = objwmiservice.execquery _ ("Select * from Win32_NTEventLogFile where LogFileName='System'") For Each objlogfile in collogfiles Wscript.Echo objlogfile.numberofrecords Next After that, you should save the file with the vz-poststart.vbs name, create the scripts subdirectory in the C:\vz\Private\101\ directory, and place your script to this subdirectory. Make sure that the full path of the script is C:\vz\Private\101\scripts\vz-poststart.vbs. From this point on, the vzpoststart.vbs script will be executed every time you start Container 101. Note: By default, Virtuozzo is shipped with the vz-poststart.cmd script located in the C:\vz\Scripts\ directory. This script is needed for all Containers residing on the Hardware Node to perform certain operations necessary for Container error-free functioning. However, specifying your own per-container scripts (i.e. scripts in the C:\vz\private\CT_ID\scripts\ directory) prevents the vz-poststart.cmd script from running. Therefore, you should make sure that each of your per-container scripts calls the C:\vz\Scripts\vz-poststart.cmd script.

16 16 C HAPTER 3 Parallels Virtuozzo Command Line Interface This chapter documents the utilities supported in the current version of Parallels Virtuozzo Containers for Windows. For every utility, all available command-line options are described. All the Parallels Virtuozzo utilities are supposed to be run on the Hardware Node by using the cmd.exe command interpreter, which can be opened by selecting Start --> Run and executing the cmd command. There are a number of regulations which should be observed while working in the command prompt window. One of such rules would be to enclose in quote marks any parameter consisting of two or more words (e.g. "C:\Program Files"). Please consult the Microsoft Command-line reference ( to learn the rules of working in the command prompt window. The Virtuozzo command-line utilities can be subdivided into the following categories: general utilities, licensing utilities, Container migration utilities, Container backup utilities, template management utilities, and supplementary utilities. General utilities are intended for performing day-to-day maintenance tasks: vzctl vzlist vzquota Utility to control Containers. Utility to view a list of Containers existing on the Node with additional information. Utility to control Virtuozzo disk quotas. Licensing utilities allow loading new license files and viewing the state of the license: vzlicview vzlicload Utility to show the Virtuozzo license status and parameters. Virtuozzo license loader. Container migration utilities allow you to migrate Containers between Hardware Nodes or within one Hardware Node: vzmigrate vzmlocal vzp2v Utility for migrating Containers to another Hardware Node. Utility for the local cloning or moving of the Containers. Utility for migrating physical servers to Containers on the Hardware Node. Container backup utilities allow you to back up and restore the Container private areas, configuration files, and quota information: vzabackup vzarestore vzvssctl Utility to back up Containers and to store them either on a local Node or on a special Backup Node. Utility to restore Containers backed up by using the vzabackup utility. Utility to suspend and resume the Container activity during the backup operation.

17 Parallels Virtuozzo Command Line Interface 17 Template management utilities allow you to create new templates, install them on the Hardware Node, and perform various operations on them: vzpkgls vzpkgdeploy vzpkgadd vzpkgrm Utility to get a list of templates available on the Hardware Node and in Containers. Utility to install/remove OS and application templates on/from the Hardware Node. Utility to add a new application template to a Container. Utility to remove a template from a Container. Supplementary utilities perform a number of tasks and are used by other Virtuozzo utilities: vzsveinstall Utility to create the Service Container on the Hardware Node. vzkeygen vzcache vzlscache vzuncache Utility to show the Hardware Node ID. Utility to cache common files across Containers. Utility to list the directories created by vzcache. Utility to detach a Container from its cache and copy the cached files back to the Container private area. In This Chapter vzctl vzlist vzquota Licensing Utilities Migration Utilities Backing-Up Utilities Template Management Utilities Supplementary Tools vzctl vzctl is the primary tool for Container management. To use it, you have to log in to the Hardware Node as the administrator. The syntax of vzctl is: vzctl [--quite --verbose] command CT_ID vzctl --version vzctl --help Where command can be one of the following: create delete destroy mount umount start stop Used to create a Container. Used to remove a Container. Like vzctl delete, this command is also used to remove a Container from the Hardware Node. Used to mount the Container private area. Used to unmount the Container private area. Starts a Container. Stops a Container.

18 Parallels Virtuozzo Command Line Interface 18 restart status set enter Restarts a Container. Displays the Container status. Used to set Container parameters, including resource control settings, the Container private area location, its hostname, IP addresses, etc. Provides a way for Hardware Node administrators to enter a Container without knowing the Container root password. Use this command with caution and never run it on untrusted Containers. exec, exec2 These two commands allow you to run arbitrary commands inside a Container without logging in to the corresponding Container. The difference between the command is their returned status. mountext Used to mount folders and drives of the Hardware Node to a Container. umountext partadd partdel interface reinstall shrink Used to unmount external folders and drives of the Hardware Node from a Container. Used to create a new Container drive by mounting it to a loopback file on the Hardware Node. Used to unmount the Container drive mounted by means of the vzctl partadd command from a file on the Hardware Node. Used to manage network adapters on the Hardware Node and inside Containers. Use to restore the original state of the Container system and application files if the Container was broken for some reason or other. Used to shrink Container virtual disk drives of the compact type. Verbosity options can be used with any of the above commands and they are: --quiet --verbose Disables logging to the display and to the log file. Sets the log level to the maximum possible value for this vzctl session. You can also pass to vzctl one of the following options: --version --help Displays the Virtuozzo version currently installed on the Hardware Node. Displays the usage information on vzctl.

19 Parallels Virtuozzo Command Line Interface 19 vzctl create This command is used to create a new Container on your Hardware Node. It has the following syntax: vzctl create CT_ID --pkgset name [--ipadd ip_address] [--hostname hostname] [--config filename] [--private path] [--disktype plain sparse compact] With this command, you can create regular Containers. A Container ID is required for this command and shall be unique within a Hardware Node. Note: Container IDs from 1 to 100 are reserved for internal Virtuozzo needs. Do not use IDs from 1 to 100 for your Containers. Command arguments are as follows: Name --pkgset name --ipadd ip_address --hostname hostname --config filename --private path Description Mandatory. Denotes the OS template to be used for the Container creation. Optional. Adds the specified IP address to the list of IP addresses the Container can use and brings up the network interface with this address inside the Container. Optional. The hostname to be assigned to the Container. Optional. If this option is given, vzctl copies the values from the sample Container configuration file located in the X:\Program Files\SWSoft\Virtuozzo\Configs folder on the Hardware Node and having the name in the form of ve-<name>.confsample. The sample configuration files usually have a number of resource control limits for the Container and some application templates to be added to the Container immediately upon its creation. If you skip this option, you will have to set resource control parameters for the Container by using the vzctl set command before you are able to start the Container. The application templates will have to be also added manually. Optional. Specifies the location of the Container private area. The Container private area can be placed anywhere on your hard disk. For example, you may specify the --private F:\MyPrivateArea argument to locate your Container private area in the MyPrivateArea folder on the F:\ volume in case the F:\ volume exists on the Hardware Node. While defining a path for this folder, you should take care of the following: This folder cannot be a mount point, i.e. you cannot mount external disk partitions to this folder. This folder cannot be a network share, i.e. it cannot be located on a server network drive. The hard disk partition where this folder will be located should have no less than 10 Gb of free disk space.

20 Parallels Virtuozzo Command Line Interface 20 --disktype plain sparse compact Optional. The type of the Container virtual disk drive. It can be one of the following: plain: in this case the size of a virtual hard disk is fixed, i.e. all disk space is allocated during the virtual disk creation. sparse: in this case the size of a virtual hard disk is also fixed and disk space is allocated during the disk creation. However, an.efd file corresponding to a virtual hard disk can be regarded as a standard NTFS file supporting the 'sparse file' functionality. When the 'sparse file' functionality is enabled, the Host OS does not allocate hard drive space to an.efd file except in regions where it contains non-zero data. This allows you to make the disk space usage inside your Containers more efficient. compact: in this case you set only the maximal size of a virtual hard disk. A Container hard disk grows in size each time new data is written to the hard disk and can increase as large as the maximum size specified during the hard disk creation. When creating a new Container, you should specify a unique ID for it. There are no restrictions besides uniqueness from the vzctl standpoint. However, it is advisable to assign different ID ranges to Hardware Nodes in multi-node environments. For example, you can use IDs from 101 to 2000 on the first node, IDs from 2001 to 4000 on the second one and so on. This will help you in tracking down the node where Container was created and will eliminate possibility of Container IDs conflicts when migrating Containers between Nodes. vzctl delete and vzctl destroy These commands are used to delete a Container, which is no longer needed, from the Hardware Node. The syntax of the commands is as follows: vzctl delete <CT_ID> vzctl destroy <CT_ID> When executed, vzctl delete/vzctl destroy physically removes all the files located in the Container private area with the default path of C:\vz\private\CT_ID. These commands do not take any additional arguments and require the Container to be stopped and its private area to be dismounted. Note: The vzctl delete command introduced in Virtuozzo 4.0 for the first time is meant to replace the vzctl destroy command in future. However, vzctl destroy is fully supported in the current version of Virtuozzo Containers; so, it depends entirely on you which command to use for removing Containers from your Hardware Node.