Nginx DNS Resolver Configuration Instance _nginx

Nginx need to manually specify resolver when communicating through Proxy_pass and upstream server. This error can occur at some point when DNS resolution fails:

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Domain.com could not to be resolved.

You can specify multiple DNS and reset the domain name TTL extension nginx resolution cache to ensure resolution success:

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Resolver 223.5.5.5 223.6.6.6 1.2.4.8 114.114.114.114 valid=3600s;

If there are parsing errors, you can use DNSMASQ to build your own DNS locally, incidentally, with the benefit of accelerated parsing:

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#/etc/dnsmasq.conf
domain-needed
Bogus-priv
cache-size=51200
listen-address=127.0.0.1

#server =223.5.5.5
Resolv-file=/etc/resolv.conf

Also note that Proxy_pass is not every request will be resolved, if upstream IP frequent changes, you need to force resolution:

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# via http://forum.nginx.org/read.php?2,215830,215832
Resolver 127.0.0.1;
Set $backend "foo.example.com";
Proxy_pass http://$backend;