herdr-core machine add kept failing with "core did not start within 5 s".
Cause: hc puts its core socket under XDG_RUNTIME_DIR, which on Unraid is
/run/user/0 — created and destroyed per login session by elogind. The socket
vanished with the session that started the core, so later clients found an
empty directory. The core itself kept running on an unlinked socket, and
core.log stayed empty because the failure is client side.
Fixed entirely on the Mac with a --via transport that pins
XDG_RUNTIME_DIR=/var/run/herdr-rt. Nothing on the server was changed. The
transport uses key auth on 192.168.10.20:422, not Tailscale SSH, since --via
needs something that asks nothing and the default tailnet ACL demands
periodic browser re-auth.
Also records the reboot caveat (/ is RAM, so the remote hc binary is lost)
with a go-script fix written up but not applied, and corrects the
192.168.31.0/24 note: that shim was created for a Pi-hole that AdGuard
replaced.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
