10-10-2011
The alternate server is used in case the Preferred (or primary) isn't reachable, or sometimes if it can't serve the domain requested.
Yes, it's possible, but complicated. One option (which I've never even attempted since every description of it has big warnings associated with it) is a split-horizon DNS server setup, where it serves different answers based on the source IP of the request. The other option is to assign multiple IPs to the server, and have multiple DNS instances listening, each with it's own IP and set of configuration files.
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LEARN ABOUT CENTOS
ipa-replica-prepare
ipa-replica-prepare(1) IPA Manual Pages ipa-replica-prepare(1)
NAME
ipa-replica-prepare - Create an IPA replica file
SYNOPSIS
ipa-replica-prepare [OPTION]... hostname
DESCRIPTION
Generates a replica file that may be used with ipa-replica-install to create a replica of an IPA server.
A replica can only be created on an IPA server installed with ipa-server-install (the first server).
You must provide the fully-qualified hostname of the machine you want to install the replica on and a host-specific replica_file will be
created. It is host-specific because SSL server certificates are generated as part of the process and they are specific to a particular
hostname.
If IPA manages the DNS for your domain, you should either use the --ip-address option or add the forward and reverse records manually using
IPA plugins.
Once the file has been created it will be named replica-hostname. This file can then be moved across the network to the target machine and
a new IPA replica setup by running ipa-replica-install replica-hostname.
A replica should only be installed on the same or higher version of IPA on the remote system.
OPTIONS
--dirsrv_pkcs12=FILE
PKCS#12 file containing the Directory Server SSL Certificate and Private Key
--http_pkcs12=FILE
PKCS#12 file containing the Apache Server SSL Certificate and Private Key
--dirsrv_pin=DIRSRV_PIN
The password of the Directory Server PKCS#12 file
--http_pin=HTTP_PIN
The password of the Apache Server PKCS#12 file
-p DM_PASSWORD, --password=DM_PASSWORD
Directory Manager (existing master) password
--ip-address=IP_ADDRESS
IP address of the replica server. If you provide this option, the A and PTR records will be added to the DNS.
--reverse-zone=REVERSE_ZONE
The reverse DNS zone to use
--no-reverse
Do not create reverse DNS zone
--ca=CA_FILE
Location of CA PKCS#12 file, default /root/cacert.p12
--debug
Prints info log messages to the output
EXIT STATUS
0 if the command was successful
1 if an error occurred
IPA
Mar 14 2008 ipa-replica-prepare(1)