Hello,
after installing Nginx on a new system I have some issues when rebooting the system. Nginx is unable to start and throws this error:
`nginx: [emerg] host not found in upstream "mydomain.com" in /etc/nginx/sites-enabled/test.conf:33`
When I try to ping mydomain.com it works without any issues, I also can start the Nginx service manually. Is it possible that Nginx tries to start before the system can resolve host names?
Possibly DNS issue? I’d go with the IP if possible…
Have you tried adding
resolver XXX.XXX.XXX.XXX;
To your config? Where XXX. etc is the IP of a DNS server?
What distro are you using? I encountered this issue with the nginx package in Debian Stretch. It bundled a systemd service file for nginx that had an `After=network.target` dependency, so it tried to start the nginx service before the network was fully available/working. Nginx then wasn’t able to resolve the upstream domain into an IP address and failed to start.
After overriding the service file so it has `After=network-online.target` dependency instead, nginx was able to start upon reboot reliably.