02-06-2014
Assuming that 192.168.1.1 and 192.168.1.2 are both DNS servers and that they are Primary and Secondary respectively.
You can test whether they are both working DNS servers with:
nslookup microsoft.com 192.168.1.1
nslookup microsoft.com 192.168.2.1
The /etc/nsswitch.conf posted will give up if the Primary DNS is down.
With "NOTFOUND=return" first I don't think that your server will ever look at the secondary (or any reserve) DNS's listed in your /etc/resolv.conf .
Unless your server does tons of DNS lookups on computers which are for some reason not in your DNS, imho this is much better:
hosts: dns [NOTFOUND=continue UNAVAIL=continue TRYAGAIN=continue] files
(I cut/paste this from one of my long-term reliable computers. Not my original work and I would like to credit the tip, but it's been too long).
Last edited by methyl; 02-06-2014 at 08:02 PM..
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LEARN ABOUT DEBIAN
polygraph-dns-cfg
POLYGRAPH-DNS-CFG(1) User Commands POLYGRAPH-DNS-CFG(1)
NAME
polygraph-dns-cfg - DNS server configuration tool
SYNOPSIS
dns-cfg [--option ...]
DESCRIPTION
Given a zone name, DNS names, and IP addresses, dns-cfg builds configuration suitable for use with BIND and, perhaps, other DNS servers.
Dns-cfg output consists of three parts. The first part is the text to cut-and-paste into BIND's named.conf file. This part is sent to the
standard output. The outer two parts are direct and reverse zone files. Those may be quite large and are dumped on disk into the appropri-
ately named files. Dns-cfg can use PGL configuration as the source of information.
OPTIONS
--help list of options
--version
package version info
--config <filename>
PGL configuration
--cfg_dirs <dirs>
directories for PGL #includes
--zone <str>
zone name
--addresses <str>
IP addresses
--names <str>
domain names
COPYRIGHT
Copyright (C) 2003-2006 The Measurement Factory, Inc.
SEE ALSO
polygraph(7) - general information and a list of programs
http://www.web-polygraph.org/ - project web site
polygraph-dns-cfg - Web Polygraph February 2010 POLYGRAPH-DNS-CFG(1)