[Monetdb-developers] gethostbyname() problem

Sjoerd Mullender sjoerd at acm.org
Tue Apr 17 16:10:19 CEST 2007


Jan Flokstra wrote:
> On Tuesday 17 April 2007 14:48, you wrote:
>> Jan,
>>
>> I suppose your system is Fedora Core 6, right?
>> (see `grep . /etc/redhat-release /etc/fedora-release`)
>>
> 
> -bash-3.1$ grep . /etc/redhat-release /etc/fedora-release
> /etc/redhat-release:Fedora Core release 6 (Zod)
> /etc/fedora-release:Fedora Core release 6 (Zod)
> -bash-3.1$    
> 
>> What do the following do/say?
>>
>> 	grep localhost /etc/hosts
> 
> -bash-3.1$ grep localhost /etc/hosts
> ::1     localhost.localdomain   localhost
> 
>> 	host localhost
> 
> -bash-3.1$ host localhost
> Host localhost not found: 3(NXDOMAIN)

Here is the bug.  The system is badly configured.  localhost should be a
valid host name, and it should resolve to 127.0.0.1 (or ::1 if using IPv6).

>> 	host <your-fully-qualified-host-name>
>>
> Host localhost not found: 3(NXDOMAIN)
> -bash-3.1$ host u007694.hum.uva.nl
> u007694.hum.uva.nl has address 146.50.78.129
> 
> 
>> 	MapiClient -lx -h <your-fully-qualified-host-name>
>>
> -bash-3.1$ MapiClient -h u007694.hum.uva.nl
> !ERROR mapi_reconnect: connect: Connection refused
> MAPI  = monetdb at u007694.hum.uva.nl:50000
> ACTION= mapi_reconnect
> ERROR = Setup connection failed
> -bash-3.1$                  
> 
> OK gethostbyname() now works. (It only fails now because I did not start the 
> mapi listener accepting connection from other machines then localhost. How 
> does this work, I use to do pfstart(true) but this now all automagically.)
> So it looks as if this system is just badly configured.!
> 
> Jan.
> 
>> Stefan
>>
>> On Tue, Apr 17, 2007 at 02:35:06PM +0200, Jan Flokstra wrote:
>>> Hi All,
>>>
>>> I have a very strange problem running MapiClient on a RedHat system at
>>> the UVA which is not a bug I think. Problem is the gethostbyname() call
>>> within Mapi is not working. The Mserver started without problems but when
>>> I try to run Mapi:
>>>
>>> bash-3.1$ MapiClient -lx
>>> MAPI  = monetdb at localhost:50000
>>> ACTION= mapi_reconnect
>>> ERROR = gethostbyname failed
>>>
>>> /proc/version says:
>>> Linux version 2.6.20-1.2925.fc6 (brewbuilder at hs20-bc2-3.build.redhat.com)
>>> (gcc version 4.1.1 20070105 (Red Hat 4.1.1-51)) #1 SMP Sat Mar 10
>>> 18:20:58 EST 2007
>>>
>>> I have had a lot of other problems with this system like bootstrap
>>> complaining the filesys refcounts are not correct or the problem that
>>> after installation of MonetDB all file mask bits (rwx) of group-other
>>> (go) are ---,
>>>
>>> Anybody any idea what could cause the gethostbyname() problem here???
>>>
>>> JanF.
>>>
>>>
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-- 
Sjoerd Mullender

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