Could not resolve ip through DNS Post: 302986543

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Operating Systems Linux Red Hat Could not resolve ip through DNS Post 302986543 by Scrutinizer on Sunday 27th of November 2016 04:16:37 AM

11-27-2016

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Perhaps the host cache needs to be invalidated (nscd, sssd)? What OS and version are you using?

From man nscd of an old version of nscd for example:

Code:

NOTES

       Nscd doesn't know anything about the underlaying protocols for  a  ser-
       vice.  This  also  means,  that  if you change /etc/resolv.conf for DNS
       queries, nscd will continue to use the old one if you  have  configured
       /etc/nsswitch.conf  to  use  DNS  for host lookups. In such a case, you
       need to restart nscd.

Newer version of nscd try to watch for changes to this file, but even then there may be a delay..

See for example here:
https://www.unix.com/man-page/linux/8/nscd/

Code:

NOTES
       The daemon will try to watch for changes in configuration files appropriate for each data-
       base (e.g., /etc/passwd for the passwd database or /etc/hosts and /etc/resolv.conf for the
       hosts database), and flush the cache when these are changed.  However,  this  will  happen
       only  after  a  short delay (unless the inotify(7) mechanism is available and glibc 2.9 or
       later is available), and this auto-detection does not cover configuration  files  required
       by nonstandard NSS modules, if any are specified in /etc/nsswitch.conf.	In that case, you
       need to run the following command after changing the configuration file of the database so
       that nscd invalidates its cache:

	   $ nscd -i <database>

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LEARN ABOUT HPUX

nisd_resolv

rpc.nisd_resolv(1M)													       rpc.nisd_resolv(1M)

NAME

       rpc.nisd_resolv - DNS service daemon for NIS

SYNOPSIS

       file_descriptor]] transport] program_number]

DESCRIPTION

       is  an auxiliary process which provides DNS forwarding service for NIS hosts requests.  The process is started by (NIS server) when invoked
       with the option.  It requires the file to be set up for communication with a DNS nameserver.  The utility can be used to verify	communica-
       tion with a DNS nameserver.  See resolv.conf(4) and nslookup(1).

       Although it is not recommended, can also be started independently with the following options.

   Options
       Uses the specified file descriptor for service

       Runs in foreground.

       Uses the specified transient program
	      number for RPC service procedure.

       Uses the specified transport.

       Operates in verbose mode.
	      Sends output to:

       Operates in verbose mode.
	      Sends output to stdout.

AUTHOR

       was developed by Sun Microsystems, Inc.

FILES

       resolver configuration file.

SEE ALSO

       nslookup(1), ypserv(1M), resolv.conf(4), ypfiles(4).

															       rpc.nisd_resolv(1M)

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