topic Re: Error in hostname resolution in Operating System - HP-UX

Error in hostname resolution

Manish_33 — Mon, 24 Jul 2006 09:47:01 GMT

Hi Friends,

I have an application which takes a hostname as a parameter. My problem is that it is able to resolve hostnames, ip addresses but not "localhost". What I could guess from the output of tusc is that it is trying to resolve hostname from dns while it should have tried /etc/hosts first. My nsswitch.conf has entries like
passwd: files
group: files
hosts: files dns
services: files
networks: files
protocols: files
rpc: files
publickey: files
netgroup: files
automount: files
aliases: files

Therefore I expect it to open /usr/lib/libnss_files.1 first instead of libnss_dns.1.

Below is a snapshot of tusc trace. Any suggestions. ???

open("/etc/nsswitch.conf", O_RDONLY, 0666) ............................................................ = 5
ioctl(5, TCGETA, 0x7a0030a8) .......................................................................... ERR#25 ENOTTY
read(5, "# \n# / e t c / n s s w i t c ".., 8192) ................................................... = 401
read(5, 0x40011020, 8192) ............................................................................. = 0
close(5) .............................................................................................. = 0
open("/usr/lib/libnss_dns.1", O_RDONLY, 0) ............................................................ = 5
fstat(5, 0x7a003018) .................................................................................. = 0
read(5, "0210010e0512@ \0\0\0\0\0\0\0\0\0".., 128) .................................................... = 128
lseek(5, 128, SEEK_SET) ............................................................................... = 128
read(5, "10\0\004\0\0\0( \0\0S ec\0\010\0".., 48) ..................................................... = 48
read(5, "80\0\0\v\0\0\004\0\0\0\0", 12) ............................................................... = 12

Re: Error in hostname resolution

Jaime Bolanos Rojas. — Mon, 24 Jul 2006 10:09:07 GMT

Manish,

Please run an nslookup ipaddress-server
You should see that the resolution was made by the /etc/hosts file.

If this is the case, then the problem must be with the application.

Regards,

Jaime.

Re: Error in hostname resolution

Manish_33 — Mon, 24 Jul 2006 10:14:54 GMT

Hi,

Yes nslookup resolves it correctly and that too using files. When I give "localhos" instead of localhost my application tries dns first and then after few steps tries files which I assume is because it was unable to resolve from dns.

Shouldn't that happen for localhost too. Somehow it is also trying to open /etc/environment file. I am not sure why is that ?????.....

Re: Error in hostname resolution

Jaime Bolanos Rojas. — Mon, 24 Jul 2006 10:18:30 GMT

Manish,

Make sure that you have this line in your /etc/hosts file:

127.0.0.1 localhost loopback

Regards,

Jaime.

Re: Error in hostname resolution

A. Clay Stephenson — Mon, 24 Jul 2006 10:21:07 GMT

/etc/environment is not a standard file so I suspect it was created for/by your application. You may be able to edit it to change your application's behavior.

As a workaround, you should be able to create a DNS localhost entry although that more or less defeats the purpose because localhost should be able to be resolved whether or not a viable network is available.

Re: Error in hostname resolution

HGN — Mon, 24 Jul 2006 10:44:07 GMT

Hi

If you think this issues is resolved you can close this thread and also provide points to the people who have helped.
You have only given points to 1 out of 33 responses, hpe you understand that people spend their valuable time helping and to by assigning point it shows gratitude for their help even a 1 point is better than not assigning

Rgds

HGN

Re: Error in hostname resolution

Manish_33 — Tue, 25 Jul 2006 00:09:50 GMT

Hi,

Sorry HGN. I admit my mistake. Thanks everyone for answering. but yet the issue is not resolved :-( that is why i am not closing the thread.