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this post was submitted on 20 Sep 2024
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I'll ask this question because it might be something you didn't think of.
What happens to your network connection if the VPN fails? will it continue to connect without a VPN?
I had a similar case of that happening, and ended up causing me to get some shame mail from my ISP.
now I run my VPN inside docker, and any containers that need access to it are configured as network slaves to it. VPN goes down? container reboots, all the others reboot after connection is restored, but will have no connection while it's down.
it's all in a well designed system of healthchecks and container configuration.
You can force all outgoing traffic to use the VPN interface via iptables/routes (meaning if it doesn’t exist or doesn’t work nothing will be able to access the internet) OR use systemd globally hide the non-VPN network interface from all services except for the VPN client.
IMO this is the best OS way, but without nix it's a pita to maintain through restores/rebuilds. personally I never fully comprehended how to properly configure iptables/routes (I did try though, so nobody can blame me lol).
however, a major benefit to using a contained VPN or gluetun is that you can be selective on what apps use the VPN.
I host 12 other containers (with nas mounts) on the same host outside of the three that need to use a VPN, so this is why the solution I described works for me. and should I ever need to use routes for more advanced network filtering I still have it available without adding the complexity of splitting normal traffic vs VPN traffic.
No it isn't. You can even define those routing polices in your systemd network unit alongside the network interface config and it will manage it all for you.
If you aren't comfortable with systemd, you can also use simple "ip" and "route" commands to accomplish that, add everything to a startup script and done.
Systemd can do that for you as well, you can tell that a certain service only has access to the wg network interface while others can use eth0 or wtv.
More classic ip/route can also be used for that, you can create a routing table for programs that you want to force to be on the VPN and other for the ones you want to use your LAN directly. Set those to bind to the respective interface and the routing tables will take place and send the traffic to the right place.
You're using docker or similar, to make things simpler you can also create a network bridge for containers that you want to restrict to the VPN and another for everything else. Then you set the container to use one or the other bridge.
There are multiple ways to get this done, throwing more containers, like gluetun and dragging xyz dependencies and opinionated configurations from somewhere isn't the only one, nor the most performant for sure. Linux is designed to handle this cases.