I have been searching for a way to visualize an OpenVPN setup for some time now. I need it to be virtual because of my lack of physical machines. I have had OpenVPN running before using Ethernet bridging, but without the adequate hardware, it is time to go virtual and use routing methods instead of bridging.

With a little bit of google searching I found “Adding openvpn support to openvz VPS” on biogeogen.com. The post in question gets you started, but leaves out a few pointers.

1) Don’t use the /etc/modules.conf file, just throw up modprobe tun inside of /etc/rc.d/rc.local. So the command will be executed each boot time. This is of course if after using lsmod | grep tun, you discover that tun support is not automatically loaded.
2) You need to have the virtual node off before running the following command on it: vzctl set 101 --capability net_admin:on --save. Where 101 is the VEID.
3) To execute commands on said virtual node with vzctl exec, you then need it to be started.

So the revised pastie:

lsmod | grep tun
[no output, then -->] modprobe tun
[stop the container]
vzctl set 101 --devices c:10:200:rw --save
vzctl set 101 --capability net_admin:on --save
[start the container]
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

For setting up OpenVPN inside of the virtual node see: OpenVPN on Debian linux.