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Does Nginx honor DNS TTLs for proxy upstreams?

csg
September 26, 2011 04:42AM
I have a short question on Nginx's proxy module. In our setup we reverse proxy specific requests to the server of an external partner via proxy_pass. Over the weekend the partner updated DNS but Nginx wasn't catching up the change and still sent traffic to the old server despite the fact the TTL of the record was little enough.

An additional obstacle might be that in our case we have for example

proxy_pass http://foo.example.com;

where foo.example.com is a CNAME to bar.example.com (TTL of 1 hour) which is a A record (TTL of 60 seconds).

Does Nginx honor DNS changes for upstream proxies or are lookups only done once on startup? If not, will the TTL being honor even if it has to traverse a list of CNAME records until it hits an A record?

Both configuration directives, resolver and resolver_timeout are not set, therefore the default of 30 seconds should apply (if that is relevant here).

$ nginx -V
nginx: nginx version: nginx/1.0.3
nginx: configure arguments: --prefix=/usr/share/nginx --conf-path=/etc/nginx/nginx.conf --sbin-path=/usr/sbin/nginx --http-log-path=/var/log/nginx/access.log --error-log-path=/var/log/nginx/error.log --pid-path=/var/run/nginx.pid --user=nginx --group=nginx --with-http_geoip_module --with-http_gzip_static_module --with-http_realip_module --with-http_secure_link_module --with-http_stub_status_module --add-module=../agentzh-echo-nginx-module-1c4e116 --add-module=../ngx-fancyindex-0.3.1 --add-module=../agentzh-headers-more-nginx-module-2cbbc15

Thanks in advance!
Subject Author Posted

Does Nginx honor DNS TTLs for proxy upstreams?

csg September 26, 2011 04:42AM

Re: Does Nginx honor DNS TTLs for proxy upstreams?

Maxim Dounin September 26, 2011 05:38AM

Re: Does Nginx honor DNS TTLs for proxy upstreams?

csg September 26, 2011 09:40AM

Re: Does Nginx honor DNS TTLs for proxy upstreams?

Maxim Dounin September 26, 2011 09:58AM

Re: Does Nginx honor DNS TTLs for proxy upstreams?

csg September 28, 2011 12:05PM

Re: Does Nginx honor DNS TTLs for proxy upstreams?

Maxim Dounin September 28, 2011 12:14PM

Re: Does Nginx honor DNS TTLs for proxy upstreams?

csg September 28, 2011 03:35PM

Re: Does Nginx honor DNS TTLs for proxy upstreams?

csg September 29, 2011 03:31AM

Re: Does Nginx honor DNS TTLs for proxy upstreams?

csg September 29, 2011 03:32AM

Re: Does Nginx honor DNS TTLs for proxy upstreams?

csg September 29, 2011 03:53AM

Re: Does Nginx honor DNS TTLs for proxy upstreams?

Maxim Dounin September 29, 2011 03:30AM

Re: Does Nginx honor DNS TTLs for proxy upstreams?

csg October 04, 2011 04:12AM



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