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Virtualization FAQ

APPLIES TO:
  • Parallels Business Automation - Standard 4.0
  • Parallels Cloud Server 6.0
  • Parallels Virtuozzo Containers for Linux 4.7
  • Parallels Virtuozzo Containers for Linux 4.0
  • Parallels Virtuozzo Containers for Windows 6.0
  • Parallels Virtuozzo Containers for Windows 4.6
  • Parallels Virtuozzo Containers for Windows 4.0
  • Parallels Server
  • Parallels Virtual Automation 6.0

Table of contents

Parallels Virtuozzo Containers for Linux and Parallels Cloud Server

Server administration and maintenance

Templates

Network

Migration

Common problems and fixes

Parallels Virtuozzo Containers for Windows

Server administration and maintenance

Templates

Network

Parallels Virtuozzo Containers for Linux and Parallels Cloud Server

Server administration and maintenance

Since Linux kernel 2.6.24, it mounts file-systems with the relatime option if it is supported by the file-system.

That is, starting from PVC 4.7 and in PSBM 5, PCS 6, this is the default option when Ext3/4 is mounted.

This means also that for ploop-based containers of PCS 6, this is the default option as well, and there is no need to set it specifically.

  • What is the BURST_CPULIMIT?

    BURST_CPULIMIT is a parameter according to the container that the CPU is limited by if its usage is more than BURST_CPU_AVG_USAGE. For more information, please refer to this documentation.

Templates

Network

  • Is Open vSwitch supported?

    It is supported in Parallels Cloud Server; the version of vSwitch is 1.6. By default, support for Open vSwitch is disabled and Linux bridges are used instead. Find more information in #115685.

  • How do I enable iptables modules for a container?

    It is not possible to enable an iptables module inside a particular container; however, you can enable it on the Hardware Node and allow the module on a per-container basis: #113056

Migration

Common problems and fixes

  • Migration with NFS partition

    It is not possible to implement online migration when the /vz partition is located over NFS. You can find detailed steps in #111855.

  • CVE-2013-2094 vulnerability in Linux kernel

    A Linux kernel vulnerability (CVE-2013-2094) that may allow local users to gain root privileges was recently identified. Find more information at #116086.

  • Backup Problems

    There can be problems with backing up containers that have a huge number of inodes; it can be fixed by increasing timeout limits #8133. It is also possible that a container is 32-bit, making it impossible to back up this number of inodes. See #112397.

  • Migration with ISO image failed

    When you try to migrate your virtual machine, you have the following error:

    Failed to migrate the VM: You are unable to migrate the virtual machine. The virtual machine or the source and destination servers do not comply with the migration requirements. Disconnect or remove the device testvm1 from the virtual machine configuration and try again ("/usr/bin/prlctl failed, exitcode=255"). As a workaround, eject the image and try the migration again.
    

Parallels Virtuozzo Containers for Windows

Server administration and maintenance

  • How can I check PVC version?

    Check the version of Parallels Virtuozzo Containers using the vzctl tool:

    C:\> vzctl --version
    
  • Which log files are available on the Parallels Virtuozzo Containers server?

    Container start, stop, migration, creation, deletion, and configuration changes are logged in the main vzlog: C:\vzlog\YYYY.MM.DD-vzlog.log

    Package installation via vzpkg and template-related operations are logged in the vzpkg.log: C:\vzlog\vzpkg.log

        Parallels Virtuozzo Containers and template update operations are logged in the `vzupdate.log`: `C:\vzlog\vzupdate.log`
    
    
    XML API, SOAP API, backup, and other PVA Agent-related operations are logged in the `vzagent.log`: `C:\vzlog\PVA\Agent\YYYY.MM.DD-vzagent.log`
    
  • Is it safe to install Microsoft .NET Framework on a Hardware Node?

    It is not recommended to install .NET Framework on a Hardware Node (#11220). It should be installed inside containers. For more information, please refer to #111448.

  • How do I keep my PVC server up-to-date?

    Virtuozzo update service should be running on the Hardware Node. It will detect PVC updates and install them. As for Windows Updates, they will be downloaded with Windows Automatic Updates. For more information, you can follow #985.

  • Can I install unsupported Windows updates?

    In some cases, you can install updates that are not listed as supported. To check whether you can install an update, refer to this article #113428.

  • How do I manage Power Panel, PVA Agent, and Virtuozzo containers services?

    To start, stop, or restart PVA Agent service, use the pvapp tool:

    C:\> net stop pvapp
    
    C:\> net start pvapp
    

    To start, stop, or restart Virtuozzo Containers service, use the vzsrv tool:

    C:\> net stop vzsrv
    
    C:> net start vzsrv 
    

    NOTE: Containers will be restarted during this procedure.

    To start, stop, or restart Power Panel service, use the pvapp tool:

    C:\> net stop pvapp
    
    C:\> net start pvapp
    
  • How do I create, enlist, and restore backups stored on a remote Parallels Virtuozzo Containers node?

    To create a backup for a container and place the backup in remote storage, run the vzabackup command:

    C:\> vzabackup --storage %USERNAME%:"%PASSWORD%"@%REMOTE_SERVER_HOSTNAME% -F localhost -e %CTID%
    

    To enlist a container backup available in remote storage, use the vzarestore command:

    C:\> vzarestore --list --full -e %CTID% --storage %USERNAME%:"%PASSWORD%"@%REMOTE_SERVER_HOSTNAME%
    

    To restore a backup of a container using remote backup storage, use the vzarestore command:

        C:\> vzarestore -B -e %BACKUP_ID% --storage %USERNAME%:"%PASSWORD%"@%REMOTE_SERVER_HOSTNAME%
    
  • What is the difference between vzbackup and vzabackup?

    There is no difference between vzbackup and vzabackup on Parallels Virtuozzo Containers for Windows. These are two different command-line interfaces for the single backup engine. The vzbackup tool is kept for backward compatibility purposes.

  • How do I migrate a container and protect the source container from deletion?

    Use the vzmigrate command with appropriate options to keep the source and destination containers:

        C:\> vzmigrate --remove-area no Administrator@%DESTINATION_NODE% %CTID%
    
  • How do I check the exact PVA Agent version?

    Check the version of ProductBuild in the registry:

    C:\>reg query HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Parallels\PVA /v ProductBuild
    ProductBuild REG_SZ 1561
    
  • Where can I find the PVA Agent configuration file?

        All PVA Agent configuration files are located in the `etc_folder` defined in `pva.conf`.
    

    Check C:\Program Files (x86)\Parallels\Parallels Virtual Automation\Agent\bin\pva.conf and find the etc_folder section:

    <argv>
    <name>etc_folder</name>
    <value>C:\vz\PVA\Agent\Data\etc</value>
    </argv> 
    

    This output above means that the main configuration file vzagent.conf is located in C:\vz\PVA\Agent\Data\etc. For more information, refer to #6981.

  • Where can I change PVA Agent timeouts and limits?

    Locate the vzagent.conf file and adjust the required limits and timeouts there. For more information, follow #8133.

  • Where can I get a list of supported antiviruses?

    There is a list of supported antiviruses for PVC Windows: #9589

Templates

Network

  • How do I manage bridged networks?

    To see available bridged networks:

    C:\> vznetcfg net list
    

    To create a new bridged network:

    C:\> vznetcfg net new %NETWORK_NAME% %HOST_IFACE_MAC%
    

    To add the host interface to a bridged network:

    C:\> vzctl set %CTID% --save --ipadd %IPADDR%/%NETMASK% --network %NETWORK_NAME% --nettype bridged
    



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