topic Re: default behavior config for host resolution in Operating System - Linux

default behavior config for host resolution

Maaz — Wed, 12 Apr 2006 02:30:28 GMT

Hello All
Two files sets the default behavior for host resolution
i, /etc/nsswitch.conf
ii, /etc/host.conf
OK

If I want to config that first check with Dns server then local hosts file ... I have to configure both files ?
As,
in nsswitch.conf
hosts: dns file
and in host.conf
order bind,hosts

or which file have more precedenc/priority ?
that is if in case if there is a conflict e.g
in nsswitch.conf
hosts: files dns
and in host.conf
order bind,hosts

Plz Guide me
Regards

Re: default behavior config for host resolution

Alexander Chuzhoy — Wed, 12 Apr 2006 03:36:57 GMT

I never touch the /etc/host.conf file.
I edit the /etc/nsswitch.conf file.
And in your case first the check is done against the DNS (thus you must edit the file /etc/resolv.conf and to make sure that the correct DNS server appears there. It looks like this: nameserver x.x.x.x).
Then the check is done against the /etc/hosts.file.

Best practice is to put "files" before the DNS, so if there's something particular that you need only your host to resolv and the same hostname appears in DNS -you can simply add it to /etc/hosts file and that's it.

Best regards.

Re: default behavior config for host resolution

Alexander Chuzhoy — Wed, 12 Apr 2006 04:05:45 GMT

Re: default behavior config for host resolution

Sergejs Svitnevs — Wed, 12 Apr 2006 04:24:20 GMT

Maaz,

The older glibc library configured host lookup ordering in the /etc/host.conf. This library is now obsolete and useless. Version 2 of the GNU standard library, glibc, uses /etc/nsswitch.conf.

Your system will probably provide host.conf for compatibility to enable older programs linked against the older library.

Regards

Re: default behavior config for host resolution

Maaz — Wed, 12 Apr 2006 05:22:25 GMT

Very Nice help dear Alexander Chuzhoy and Sergejs Svitnevs ;)
Thanks a Million for such a promtp help

Regards
Maaz