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Wait for MagicDNS readiness before starting nginx

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Upstream blocks resolve DNS at config load. If MagicDNS isn't ready yet
(Tailscale just connected), nginx gets empty resolution and returns 502.
Poll nslookup until resolution works before launching nginx.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Erich Blume 2026-04-17 15:47:21 -07:00
commit 1236d381eb
1 changed files with 9 additions and 1 deletions
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10
fly/start.sh
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@ -11,10 +11,18 @@ tailscale up --authkey="${TS_AUTHKEY}" --hostname=flyio-proxy
until tailscale status > /dev/null 2>&1; do sleep 1; done
echo "Tailscale connected"
# Wait for MagicDNS to be ready — upstream blocks resolve DNS at config
# load, so nginx will fail to start if MagicDNS can't resolve yet.
echo "Waiting for MagicDNS..."
until nslookup forge.tail8d86e.ts.net 100.100.100.100 > /dev/null 2>&1; do
sleep 1
done
echo "MagicDNS ready"
# Ensure fail2ban deny file exists before nginx starts
touch /etc/nginx/forge-deny.conf
# Start nginx — MagicDNS is available, health check passes immediately.
# Start nginx — MagicDNS is available, upstreams resolved.
nginx -g "daemon off;" &
NGINX_PID=$!
echo "Nginx started"