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[How to] Configure TUN/TAP devices inside a container to install VPN software

APPLIES TO:
  • Parallels Cloud Server 6.0
  • Parallels Virtuozzo Containers for Linux 4.7
  • Parallels Server

Resolution

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
    

    If the module is not loaded:

    • For RHEL 4/5-based distributions

      Create a separate file /etc/init.d/addtun, link it to the proper runlevel and make it executable:

      ~# cat /etc/init.d/addtun
      #!/bin/bash
      /sbin/modprobe tun
      ~# ln -s /etc/init.d/addtun /etc/rc3.d/S10addtun
      ~# 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:

      ~# cat /etc/sysconfig/modules/vztun.modules
      #!/bin/sh
      /sbin/modprobe tun
      

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

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

      After that restart Virtuozzo service is required as module tun is supposed to be loaded before the Virtuozzo service is started.

      ~# 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 the /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.

Search words:

up tun device

vpn

TUN/TAP device




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