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feat: pre-warm tailscale path to k3s server on game node start #573

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feat: pre-warm tailscale path to k3s server on game node start #573

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16 changes: 16 additions & 0 deletions game-node-server-setup.sh
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Expand Up @@ -208,6 +208,22 @@ cat <<-'DROPIN' >/etc/systemd/system/k3s.service.d/tailscale-state-check.conf
ExecStartPre=/usr/local/bin/5stack-tailscale-state-check.sh
DROPIN

# Pre-warm the Tailscale path to the k3s server on (re)start so a one-way path
# after a reboot cannot leave the node unable to reach the control plane. Lands
# in whichever k3s unit dir this node uses; harmless no-op on server nodes.
PREWARM_DIR=/etc/systemd/system/k3s.service.d
[ -f /etc/systemd/system/k3s-agent.service.env ] && PREWARM_DIR=/etc/systemd/system/k3s-agent.service.d
mkdir -p "$PREWARM_DIR"
rm -f "$PREWARM_DIR/tailscale-prewarm.conf"
cat <<-'DROPIN' >"$PREWARM_DIR/tailscale-prewarm.conf"
[Unit]
After=tailscaled.service
Wants=tailscaled.service

[Service]
ExecStartPre=-/bin/bash -c '. /etc/systemd/system/k3s-agent.service.env 2>/dev/null || true; H=$(echo "${K3S_URL#*://}" | cut -d: -f1 | cut -d/ -f1); [ -n "$H" ] && echo "[5stack] pre-warming tailscale path to $H" && timeout 15 tailscale ping -c 3 "$H" >/dev/null 2>&1 || true'
DROPIN

cat <<-'UNIT' >/etc/systemd/system/5stack-tailscale-state-check.service
[Unit]
Description=5stack tailscale state check
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