The Kairos recovery mode can be used to recover a damaged system or to regain access remotely (with assistance) to a machine which has been lost access to. The recovery mode is accessible only from the GRUB menu, from both the LiveCD, and an installed system.
NoteOn installed system, there are two recovery modes available during boot. Below describes only how the Kairos remote recovery works. It can be used to reset the A/B partitions (with the user/pass used during setup) and perform any other operation without remote access.
Boot into recovery mode
Kairos recovery mode can be accessed either via ISO or from an installed system.
A GRUB menu will be displayed:
Select the last entry
kairos (remote recovery mode) and press enter.
At this point the boot process starts, and you should be welcomed by the Kairos screen:
After few seconds, the recovery process starts, and right after a QR code will be printed out of the screen along with a password which can be used later to SSH into the machine:
At this stage, take a screenshot or a photo and save the image with the QR code.
Connect to the machine
In the another machine that you are using to connect to your server, (your workstation, a jumpbox, or other) use the Kairos CLI to connect over the remote machine:
$ ./kairos bridge --qr-code-image /path/to/image.png INFO Connecting to service kAIsuqiwKR INFO SSH access password is yTXlkak INFO SSH server reachable at 127.0.0.1:2200 INFO To connect, keep this terminal open and run in another terminal 'ssh 127.0.0.1 -p 2200' the password is yTXlkak INFO Note: the connection might not be available instantly and first attempts will likely fail. INFO Few attempts might be required before establishing a tunnel to the host. INFO Starting EdgeVPN network INFO Node ID: 12D3KooWSTRBCTNGZ61wzK5tgYvFi8rQVxkXJCDUYngBWGDSyoBK INFO Node Addresses: [/ip4/192.168.1.233/tcp/36071 /ip4/127.0.0.1/tcp/36071 /ip6/::1/tcp/37661] INFO Bootstrapping DHT
At this point, the bridge should start, and you should be able to see connection messages in the terminal. You can connect to the remote machine by using
ssh and pointing it locally at
127.0.0.1:2200. The username is not relevant, the password is print from the CLI.
The bridge operates in the foreground, so you have to shut it down by using CTRL-C.
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