A simple script that can be executed in recovery mode to bootstrap Alpine Linux on a Linode server.
This script assumes your Linode will have three disks for boot, root, and swap, assigned to /dev/sda, /dev/sdb, /dev/sdc, respectively. If you decide not to use a swap disk, you will need to manually delete the relevant parts from the script (which should be fairly easy).
Once the disks have been created, make a new configuration profile. It can be labeled anything you would like, but the following options should be changed: Kernel to GRUB 2; Block Device Assignments to the order specified above; all Filesystem/Boot Helpers to No. Everything else should be left as the default.
Boot the Linode into recovery mode with the disks assigned as above.
Connect to the Linode with Lish either via SSH or the browser console. To download and run the script:
curl -o- https://raw.githubusercontent.com/jac0/alpine-linode-bootstrap/master/alpine-linode-bootstrap.sh | bash
Once that finishes, shut the Linode down from recovery mode and, staying in the Lish console, run:
boot 1
After a bit, you should be at the Alpine login screen. The root user, by default, does not have a password. At this point, you can install an SSH server, which pretty much completes the installation.
This script is basically Andy Leap's guide written as a working script (with fixed networking!), so big thanks to him.