[syslog-ng]syslog-ng and DNS

[Jerome Peducasse]

I'm agree with you but it's awkward that syslog-ng refuses start even if it can write in local destination (like syslogd).
However, this "feature" assures syslog-ng works completely.



On Fri, Apr 26, 2002 at 07:32:45AM -0700, Nate Campi wrote:
> On Fri, Apr 26, 2002 at 07:15:53AM -0700, Nate Campi wrote:
> > On Fri, Apr 26, 2002 at 03:36:13PM +0200, Jerome Peducasse wrote:
> > > Yes, of course but I like none of these propositions.
> > > I would like loghost stays independent of network updates (update of IP, subnet...). 
> > 
> > I'm sorry Jerome but this is a common problem seen everywhere. Everyone
> > else hardcodes a small number of critical IPs that their systems needs to
> > have in their config files. These are usually loghosts, nameservers,
> > time servers, NIS/NIS+ servers, etc.
> 
> This was before coffee, so I didn't explain the problem well. The issue
> with naming services is a chicken and egg problem. In order to use the
> DNS you need to use nameservers, but you can't refer to those
> nameservers by hostnames available only in the DNS. This is why
> resolvers use IPs for the local nameservers in their configuration.
> 
> Many services start before the network is even up, so the only way to
> use any hostnames for these services is by using a name mapping
> mechanism that doesn't require network access. /etc/hosts comes to mind.
> 
> If you're absolutely dying to have name services work for a few critical
> hosts, the answer should be obvious by now, maintain a central /etc/hosts
> file, and dist it out via rdist/rsync to all your hosts. This way you
> can modify it as needed (like the DNS) and use hostnames for services 
> that may start before the DNS can be accessed.
> 
> P.S. Time servers was a bad example of hard coded IP, I was just
> thinking of naming services and other services that start really early
> on before network based nameservices, like syslog. Again, it was before
> coffee ;)
> -- 
> "First we thought the PC was a calculator. Then we found out how to turn
> numbers into letters with ASCII - and we thought it was a typewriter.
> Then we discovered graphics, and we thought it was a television. With
> the World Wide Web, we've realized it's a brochure."    
>  - Douglas Adams (1952-2001) 
> 



-- 
Jerome Peducasse
Wanadoo Portails - Sophia Antipolis