Configure a Wireguard interface (wg)
Wireguard is a very promising VPN technology and available since Alpine 3.10 in the community repository.
apk add wireguard-lts (or wireguard-virt)
The official documents from wireguard will show examples of how to setup an interface with the use of wg-quick. In this howto we are not going to use this utility but are going to use plain wg command and busybox ifupdown.
apk add wireguard-tools-wg
Now that you have all the tools installed we can setup the interface. The setup of your interface config is out of the scope of this document, you should consult the manual page of wg.
After you have finished setting up your wgX interface config you can add it to your /etc/network/interfaces:
auto wg0
iface wg0 inet static
address x.x.x.x
netmask 255.255.255.0
pre-up ip link add dev wg0 type wireguard
pre-up wg setconf wg0 /etc/wireguard/wg0.conf
post-up ip route add x.x.x.x/24 dev wg0
post-down ip link delete dev wg0
This config will do:
- bring the wireguard interface up
- assign a config to this interface (which you have previously created)
- setup the interface address and netmask
- add the route ones the interface is up
- remove the interface when it goes down
To start the interface and stop it you can execute:
ifup wg0 ifdown wg0
If ifup wg0 fails silently, verify that the bash package is installed.
Running with modloop
If you are running from a RAM disk you can't modify the modloop.
You can get around it by unpacking the modloop, mount the unpacked modules folder and then installing wireguard.
#!/bin/sh apk add squashfs-tools # install squashfs tools to unpack modloop unsquashfs -d /root/squash /lib/modloop-lts # unpack modloop to root dir umount /.modloop # unmount existing modloop mount /root/squash/ /.modloop/ # mount unpacked modloop apk del wireguard-lts # uninstall previous wireguard install apk add wireguard-lts apk add wireguard-tools
Now you could repack the squash filesystem or put this script in the /etc/local.d/ path so it runs on boot.