Kernel TUN/TAP support
OpenVZ supports VPN inside a container via kernel TUN/TAP module and device. To allow container #101 to use the TUN/TAP device the following should be done:
Make sure the tun module has been already loaded on the hardware node:
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lsmod | grep tun
If it is not there, use the following command to load tun module:
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modprobe tun
You can also add it into /etc/modules.conf to make sure it will be loaded on every reboot automatically.
Granting container an access to TUN/TAP
Allow your container to use the tun/tap device:
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vzctl set 101 --devices c:10:200:rw --save
vzctl set 101 --capability net_admin:on --save
Where '101' is a needed veid of the VM container.
And create the character device file inside the container:
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vzctl exec 101 mkdir -p /dev/net
vzctl exec 101 mknod /dev/net/tun c 10 200
vzctl exec 101 chmod 600 /dev/net/tun
Configuring VPN inside container
After the configuration steps above are done it is possible to use VPN software working with TUN/TAP inside container just like on a usual standalone linux box.
The following software can be used for VPN with TUN/TAP:
* Virtual TUNnel (http://vtun.sourceforge.net)
* OpenVPN (http://openvpn.sourceforge.net)
Taken from the official OpenVZ wiki http://wiki.openvz.org
