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тАО02-22-2011 06:44 AM
тАО02-22-2011 06:44 AM
Hello smarts,
I am trying to force to use hosts file rather than DNS(resolv.conf), on RHEL 5.4. But doesn't work.
The order in /etc/host.conf has the following:
order hosts,bind
And the /etc/nsswitch.conf has the following:
[root]# grep hosts /etc/nsswitch.conf
#hosts: db files nisplus nis dns
#hosts: files dns
hosts: files
[root]#
[root]# nslookup
Server:
Address:
** server can't find: NXDOMAIN
[root]
Any ideas gurus?
I am trying to force to use hosts file rather than DNS(resolv.conf), on RHEL 5.4. But doesn't work.
The order in /etc/host.conf has the following:
order hosts,bind
And the /etc/nsswitch.conf has the following:
[root]# grep hosts /etc/nsswitch.conf
#hosts: db files nisplus nis dns
#hosts: files dns
hosts: files
[root]#
[root]# nslookup
Server:
Address:
** server can't find
[root]
Any ideas gurus?
Solved! Go to Solution.
3 REPLIES 3
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тАО02-22-2011 08:05 AM
тАО02-22-2011 08:05 AM
Solution
The nslookup command is originally a DNS server testing tool. The RHEL default version of nslookup will always try to contact a DNS server, because that's what it's programmed to do.
If you want to test the name resolver libraries (which use whatever is configured to /etc/nsswitch.conf), you'll need to use another tool: the "getent" command.
In your case, the command syntax is "getent hosts"
Note: the "hosts" in the getent command line does not refer to /etc/hosts directly, but to the "hosts:" line in /etc/nsswitch.conf.
The getent command can be used to test other lookup mechanisms specified in /etc/nsswitch.conf too: for example, if you're setting up LDAP and need to verify that usernames are being looked up from your chosen source, you might run a command like "getent passwd".
MK
If you want to test the name resolver libraries (which use whatever is configured to /etc/nsswitch.conf), you'll need to use another tool: the "getent" command.
In your case, the command syntax is "getent hosts
Note: the "hosts" in the getent command line does not refer to /etc/hosts directly, but to the "hosts:" line in /etc/nsswitch.conf.
The getent command can be used to test other lookup mechanisms specified in /etc/nsswitch.conf too: for example, if you're setting up LDAP and need to verify that usernames are being looked up from your chosen source, you might run a command like "getent passwd
MK
MK
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тАО02-22-2011 08:40 AM
тАО02-22-2011 08:40 AM
Re: Force nslookup use hosts file not the DNS
Mk, Thank you for the response. But getent doesn't work in my situation as one of the application is looking for the ip address which s specified in hosts file, as the DNS server has the new IP, which we haven't changed yet due to the downtime issue. Of course eventually we will change and I know it works then. Meanwhile, I thought nslookup might work looking at the hosts file rather than the resolv.conf file. But looks like not.
Thank you for the information, really very helpful.
Thank you for the information, really very helpful.
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тАО02-25-2011 06:25 AM
тАО02-25-2011 06:25 AM
Re: Force nslookup use hosts file not the DNS
how about a simple ping ?
as Matti mentioned, use a different tool.
as Matti mentioned, use a different tool.
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