docs(flatcar): cover remote reprovision (tailscale/headless/watchdog)#11
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The stock recipe uses --force and assumes console access. On a host reached only over SSH, the pivot drops the old OS's networking and the launching session with it, leaving you blind while flatcar-install rewrites the disk. Document --tailscale.authkey (tsnet, survives losing host networking), --headless (survive SSH disconnect), and --watchdog-timeout (reboot instead of brick on a hung installer).
--headless was removed from xmorph; on systemd the pivot now self-relocates into a transient scope so an SSH/run0 disconnect can't kill it, and unit-driven runs use --systemd-mode. Drop --headless from the remote example accordingly.
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What
Adds a Reprovisioning a remote host section to
docs/reprovision/flatcar.md.The stock recipe uses
--forceand assumes console access. When the target is reached only over SSH (e.g. reprovisioning a remote server), the pivot tears down the old OS's networking the instant services stop — the launching session dies with it, leaving you blind whileflatcar-installrewrites the disk.Documents the flags that keep you reachable through the pivot:
--tailscale.authkey— joins the in-RAM installer rootfs to the tailnet via tsnet (userspace; survives losing the host's own networking). Reappears as<host>-xmorphwith Tailscale SSH.--headless— detaches from the launching terminal so an SSH disconnect doesn't kill the install.--watchdog-timeout— reboots a hung installer instead of leaving a silent brick.Why now
Surfaced while dogfooding the Flatcar recipe to reprovision a real remote host (NixOS -> Flatcar). This is the gap I hit first.
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