Installation guide

106 Chapter 9. Setting Up a Red Hat Enterprise Linux LVS Cluster

It is best to turn off extraneous network interfaces by setting ONBOOT=no in their network

scripts within the /etc/sysconfig/network-scripts/ directory or by making sure the

gateway is correctly set in the interface which comes up ﬁrst.

9.1.3. Enabling NAT Routing on the LVS Routers

In a simple NAT LVS cluster where each clustered service uses only one port, like

HTTP on port 80, the administrator needs only to enable packet forwarding on the

LVS routers for the requests to be properly routed between the outside world and the

real servers. See Section 8.5 Turning on Packet Forwarding for instructions on

turning on packet forwarding. However, more conﬁguration is necessary when the

clustered services require more than one port to go to the same real server during a

user session. For information on creating multi-port services using ﬁrewall marks, see

Section 9.3 Multi-port Services and LVS Clustering.

Once forwarding is enabled on the LVS routers and the real servers are set up and have the

clustered services running, use the Piranha Conﬁguration Tool to conﬁgure the cluster as

shown in Chapter 10 Conﬁguring the LVS Routers with Piranha Conﬁguration Tool.

Warning

Do not conﬁgure the ﬂoating IP for eth0:1 or eth1:1 by manually editing

network scripts or using a network conﬁguration tool. Instead, use the Piranha

Conﬁguration Tool as shown in Section 10.4 GLOBAL SETTINGS and

Section 10.6.1 The VIRTUAL SERVER Subsection to conﬁgure any cluster-related

virtual interfaces.

When ﬁnished, start the pulse service as shown in Section 10.8 Starting the Cluster. Once

pulse is up and running, the active LVS router will begin routing requests to the pool of

real servers.

9.2. Putting the Cluster Together

After determining which of the above routing methods to use, the hardware for the LVS

cluster should be linked together on the network.