11-14-2008
You do need to stop nscd. Else, by default, ping will connect to the same host for an hour (regardless of TTL).
DNS round robin is, for lack of a better description, poor mans load balancing. It will not protect you from a host failure.
It would be better to do a `ping -s ldaptest`. That way when you ^C, it'll tell you what IP it's trying to hit. Also, wait at least 5 seconds between pings, and attempt it at least 10 times. That should give you enough host queries to flip between the two IPs.
Last edited by Diabolist; 11-14-2008 at 04:05 AM..
Reason: Misread quote
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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)