nginx + ip_nonlocal_bind

[Igor Sysoev]

On Fri, May 01, 2009 at 04:26:55PM +1000, Tristan Griffiths wrote:

> Greetings.
> 
> We would like to setup our Nginx instances in a HA pair. Using
> Heartbeat, we have Nginx listening on virtual addresses on the active
> server.
> 
> On the passive server, we cannot get Nginx to start up because those
> virtual (or floating) address are not configured on the server until
> Heartbeat detects a failover condition.
> 
> Is Nginx able to bind to a non-local IP address? We've tried setting the
> ip_nonlocal_bind kernel option with no luck.
> 
> Some important information:
> 
> # nginx -v
> nginx version: nginx/0.7.53
> 
> Starting nginx: [emerg]: bind() to 213.167.72.152:80 failed (98: Address
> already in use)

This is because another process is laready listen on this address:port.

> CentOS 5.3
> 
> <config>
> server {
>     listen 213.167.72.152:80 default;
> </config>
> 
> Any other settings we should provide?

To listen on temporarily non configured addresses you may use something
like this:

    server {
         listen  80;
    }

    server {
         listen 213.167.72.152:80 default;
         ...
    }

    server {
         listen 213.167.72.1:80 default;
         ...
    }

nginx binds to *:80 only, but tests an address where a request comes to.


-- 
Igor Sysoev
http://sysoev.ru/en/