Installation guide

/etc/sysconfig/ha/lvs.cf — the configuration file for the LVS routers.
/etc/sysctl — the configuration file that, among other things, turns on packet forwarding in the
kernel.
/etc/sysconfig/iptables — If you are using firewall marks, you should synchronize one of
these files based on which network packet filter you are using.
Important
The /etc/sysctl.conf and /etc/sysconfig/iptables files do not change when you
configure LVS using the Piranha Configuration Tool.
4.7.1. Synchronizing lvs.cf
Anytime the LVS configuration file, /etc/sysconfig/ha/lvs.cf, is created or updated, you must
copy it to the backup LVS router node.
Warning
Both the active and backup LVS router nodes must have identical lvs.cf files. Mismatched LVS
configuration files between the LVS router nodes can prevent failover.
The best way to do this is to use the scp command.
Important
To use scp the sshd must be running on the backup router, see Section 2.1, “Configuring
Services on the LVS Routers” for details on how to properly configure the necessary services on
the LVS routers.
Issue the following command as the root user from the primary LVS router to sync the lvs.cf files
between the router nodes:
scp /etc/sysconfig/ha/lvs.cf n.n.n.n:/etc/sysconfig/ha/lvs.cf
In the command, replace n.n.n.n with the real IP address of the backup LVS router.
4.7.2. Synchronizing sysctl
The sysctl file is only modified once in most situations. T his file is read at boot time and tells the kernel
to turn on packet forwarding.
Important
If you are not sure whether or not packet forwarding is enabled in the kernel, see Section 2.5,
“Turning on Packet Forwarding” for instructions on how to check and, if necessary, enable this
key functionality.
Chapter 4. Configuring the LVS Routers with Piranha Configuration Tool
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