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How to configure TUN/TAP devices inside a container to install VPN software

  • Parallels Virtuozzo Containers for Linux
  • Parallels Server


Follow the steps below to configure the TUN/TAP device in the container (all actions should be done on hardware node's side):

  1. Make sure the tun module is loaded on the hardware node:

    # lsmod | grep tun
    tun                    18979  0

    For RHEL 4/5-based distributions create a separate file /etc/init.d/addtun, link it to the proper runlevel and make it executable:

    [root@mypvc ~]# cat /etc/init.d/addtun
    /sbin/modprobe tun
    [root@mypvc ~]# ln -s /etc/init.d/addtun /etc/rc3.d/S10addtun
    [root@mypvc ~]# chmod +x /etc/init.d/addtun

    At next server reboot tun module should be loaded.

    For RHEL/CentOS 6.x based distributions create a separate file /etc/sysconfig/modules/vztun.modules to let it load automatically during the boot time:

    /sbin/modprobe tun

    This file should be executable. You can make it executable by running:

    # chmod +x /etc/sysconfig/modules/vztun.modules

    This module tun is supposed to be loaded before the Virtuozzo service is started, so run

    # service vz restart

    to let Virtuozzo acknowledge this module's availability (all containers will be restarted). On SuSE-based systems, add the tun module into the MODULES_LOADED_ON_BOOT variable in /etc/sysconfig/kernel file (it should be processed by the /etc/init.d/boot.loadmodules initialization script).

  2. Allow the container to use the TUN/TAP device:

    # vzctl set CTID --devnodes net/tun:rw --save
  3. Set capability:

    # vzctl set $CTID --capability net_admin:on --save
  4. Install VPN software, which requires TUN/TAP interface such as Virtual TUNnel or OpenVPN.

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