Starting nginx without checking for upstream server availability

Igor Sysoev is at
Fri Jan 23 23:37:37 MSK 2009

On Fri, Jan 23, 2009 at 02:55:03PM -0500, John Kemp wrote:

> On Jan 23, 2009, at 2:09 PM, Igor Sysoev wrote:
> >On Fri, Jan 23, 2009 at 12:56:14PM -0500, John Kemp wrote:
> >
> >>I am using nginx in a reverse-proxy situation, with several upstream
> >>servers on different networks.
> >>I am often testing parts of my server without access to some of the
> >>upstream servers. When I try to start nginx and even a single  
> >>upstream
> >>server is unavailable, I get the message:
> >>
> >>>comp:blah johnk$ sudo /usr/local/sbin/nginx
> >>>2009/01/23 10:24:22 [emerg] 4894#0: host not found in upstream
> >>>"xxx.yyy.zzz" in /usr/local/nginx//conf/nginx.conf:18
> >>
> >>And nginx is not started.
> >>
> >>Although I like configuration checking, I'd also like to be able to
> >>start nginx even when one or more upstream servers are down. Is there
> >>a way to do that? I couldn't see a command-line option to do so, or
> >>anything that looked relevant in the config file examples on the  
> >>wiki.
> >>
> >>I am using nginx 0.7.30, compiled from source on OS X.
> >
> >One of the way  - to use IP addresses.
> Is there a way to disable on-startup host lookup altogether (other  
> than making a code change)?

There is complex way - using variables in proxy_pass:

       proxy_pass    http://host$request_uri;

but you can not disable lookups for servers inside upstream blocks.

Igor Sysoev

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