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Full Discussion: Could not resolve ip through DNS
Operating Systems Linux Red Hat Could not resolve ip through DNS Post 302986552 by Scrutinizer on Sunday 27th of November 2016 06:50:58 AM
Old 11-27-2016
Ultimately whether you can restart the daemon depends on what you agreed upon in your organisation. But I agree with MadeInGermany it should have minimal impact, only performance-wise: directory backend (like LDAP) lookups could be a bit slower for some time and it would mean a bit more work for your directory backend server.

However, depending on the configuration set in /etc/nscd.conf, the cache may be persistent across restarts, so a restart may accomplish nothing.

IMO the best way would be to issue this command:
Code:
nscd -i hosts

which would simply invalidate all the host entries in the cache..

--
If that does not do the trick, does your host use sssd?
What is the output of
Code:
grep ^hosts /etc/nsswitch.conf

?
Last edited by Scrutinizer; 11-27-2016 at 08:33 AM..
 

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LEARN ABOUT REDHAT

nscd

nscd(8) 						      System Manager's Manual							   nscd(8)

NAME

       /usr/sbin/nscd - name service cache daemon

DESCRIPTION

       Nscd  is  a  daemon that provides a cache for the most common name service requests. The default configuration file, /etc/nscd.conf, deter-
       mines the behavior of the cache daemon. See nscd.conf(5).

       Nscd provides cacheing for the passwd(5), group(5), and hosts(5) databases through standard libc interfaces,  such  as  getpwnam(3),  getp-
       wuid(3),  getgrnam(3),  getgrgid(3), gethostbyname(3), and others. Each cache has a separate TTL (time-to-live) for its data; modifying the
       local database (/etc/passwd, and so forth) causes the cache to become invalidated within fifteen seconds. Note  that  the  shadow  file	is
       specifically not cached.  getspnam(3) calls remain uncached as a result.

OPTIONS

       --help will give you a list with all options and what they do.

NOTES

       Nscd  doesn't  know  anything  about  the underlaying protocols for a service. 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.

SEE ALSO

       nscd.conf(5), nsswitch.conf(5)

AUTHOR

       nscd was written by Thorsten Kukuk and Ulrich Drepper.

GNU C Library							      1999-10								   nscd(8)
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