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96 Chapter 7. Linux Virtual Server Overview

7.6.1.3. ipvsadm

This service updates the IPVS routing table in the kernel. The lvs daemon sets up and

administers an LVS cluster by calling ipvsadm to add, change, or delete entries in the

IPVS routing table.

7.6.1.4. nanny

The nanny monitoring daemon runs on the active LVS router. Through this daemon, the

active router determines the health of each real server and, optionally, monitors its work-

load. A separate process runs for each service deﬁned on each real server.

7.6.1.5. /etc/sysconfig/ha/lvs.cf

This is the LVS cluster conﬁguration ﬁle. Directly or indirectly, all daemons get their con-

ﬁguration information from this ﬁle.

7.6.1.6. Piranha Conﬁguration Tool

This is the Web-based tool for monitoring, conﬁguring, and administering an LVS clus-

ter. This is the default tool to maintain the /etc/sysconfig/ha/lvs.cf LVS cluster

conﬁguration ﬁle.

7.6.1.7. send_arp

This program sends out ARP broadcasts when the ﬂoating IP address changes from one

node to another during failover.

Chapter 8 Initial LVS Conﬁguration reviews important post-installation conﬁguration steps

you should take before conﬁguring Red Hat Enterprise Linux to be an LVS router.

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Red Hat CLUSTER SUITE 4.7 DM MULTIPATH Guide d'installation Page 112