Setup OpenVPN on Proxmox LXC

Following the previous tutorial of setting up LXC, now i would like to setup my OpenVPN into Proxmox LXC container!

Adding Dev/Tun into LXC

On the host machine, we need to enable Tun for OpenvVPN on our LXC machine, go to the path /var/lib/lxc/xxx/config or /etc/pve/lxc/xxx.conf and add the following to the last line,

lxc.cgroup.devices.allow = c 10:200 rwm
lxc.hook.autodev = sh -c "modprobe tun; cd ${LXC_ROOTFS_MOUNT}/dev; mkdir net; mknod net/tun c 10 200; chmod 0666 net/tun"

and that's all we need to do. restart the lxc container.

Adding tun file into LXC container

Now login to your LXC container and fire the following command,

cd /dev
mkdir net
mknod net/tun c 10 200
chmod 0666 net/tun

this will create the net/tun directory and file, restart the machine and we are good to go!

Install OpenVPN on Proxmox LXC

Installing OpenVPN can never be easier in just 5 minutes which i wrote previously. But i will just summarise here, all you need to do is to fire the following into your LXC using NoVNC or SSH,

wget --no-check-certificate -O ~/; bash

Follow all the instruction and we are good to go! And remember to port forward port 1194 and 53!

-A PREROUTING -i vmbr1 -p tcp -m tcp --dport 53 -j DNAT --to-destination
-A PREROUTING -i vmbr1 -p udp -m udp --dport 1194 -j DNAT --to-destination
-A PREROUTING -i vmbr1 -p tcp -m tcp --dport 1194 -j DNAT --to-destination

Setup LXC and Nat on Proxmox

The latest Proxmox 4.0 no longer support OpenVZ and we are met with LXC, Linux Container, which is kinda the next thing. But how do we setup a NAT on a LXC? Is it different from the original OpenVZ. Well, its kinda the same. But i will cut the bullshit here and goes straight to the objective. Here, we will try to create a LXC container in Proxmox and allow the same public ip to connect to the LXC container, in and out.

Installing LXC Container on Proxmox

First let's setup a container, let's create a Ubuntu container by selecting the template.

Screen Shot 2016-03-13 at 4.11.51 AM

Once we selected, let's setup the network area, take note that i have the internet bridge of vmbr1 (which will need to be change later). Do take note that /24 meaning your submask is and the Gateway should really be what you have set on your vmbr1 (which is also your bridge network to all your NAT container). In this case, mine is
Screen Shot 2016-03-13 at 4.12.33 AM

I am giving my LXC container the local ip of, just ignore the /24 for now. And setup the DNS

Screen Shot 2016-03-13 at 4.16.01 AM

And we are all done, now starts the machine and we are ready to go!

Setup NAT on Proxmox

Now this is the important part, we have 2 things to do, the first setup a new network on /etc/network/interface as show below,

auto vmbr2
#private sub network
iface vmbr2 inet static
        bridge_ports none
        bridge_stp off
        bridge_fd 0

        post-up echo 1 > /proc/sys/net/ipv4/ip_forward
        post-up   iptables -t nat -A POSTROUTING -s '' -o vmbr1 -j MASQUERADE
        post-down iptables -t nat -D POSTROUTING -s '' -o vmbr1 -j MASQUERADE

Do take note that i have added the above so that my container will have internet for all ip within the range of (1-255). Now restart the network

/etc/init.d/networking restart

after restarting update the LXC container to use vmbr2.
Screen Shot 2016-03-13 at 4.20.57 AM
Now access your LXC container via NoVNC (Chrome or Firefox) and you should be able to connect to the internet!
Screen Shot 2016-03-13 at 4.23.04 AM

Allow outside connect to LXC

Although you have internet, you will notice that you are not allow to connect to your LXC machine, this is because you did not allow outside to connect to your LXC container. In order to do that, you will need to add stuff into your iptables, add these to your host machine,

#port forward port 2222 to our LXC machine port 22 so we could ssh
iptables -A PREROUTING -i vmbr1 -p tcp -m tcp --dport 2222 -j DNAT --to-destination
#we did the below just now on network interface config
iptables -A POSTROUTING -s -o vmbr1 -j MASQUERADE
#this allows outside to connect to your LXC machines
iptables -A POSTROUTING -s -o vmbr1 -j SNAT --to-source

What we did on the vmbr2 just now is shown above, if you do not want to add that on the interface section, just do it here. Once you've done that, you should be able to ssh into your LXC container as well! All good!