How did nginx resolve names?

[andromeda123]

Hi Francis - Thank you for response explaining the difference in DNS
resolution behavior during
1) start - up
2) run time.

Can you please elaborate why start-up DNS resolution does not use `resolver`
directive? Just the way run time resolution does?

A follow up question - 
Is it feasible to use system resolver as the run time resolver by explicitly
adding it to the `resolver` directive?

Thanks.

Posted at Nginx Forum: https://forum.nginx.org/read.php?2,290889,290934#msg-290934