Red Hat ENTERPRISE LINUX AS 2.1 Installation Manual page 122

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8.1.1 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.
The adapter devices on the LVS routers must be configured to access the
same networks. For instance if eth0 connects to public network and eth1
connects to the private network, then these same devices on the backup LVS
router must connect to the same networks.
Also the gateway listed in the first interface to come up at boot time is added
to the routing table and subsequent gateways listed in other interfaces are
ignored. This is especially important to consider when configuring the real
servers.
After physically connecting together the cluster hardware, configure the network interfaces on the
primary and backup LVS routers. This can be done using a graphical application such as redhat-con-
fig-network or by editing the network scripts manually. For more information about adding devices
using redhat-config-network, see the chapter titled Network Configuration in the Official Red Hat
Linux Customization Guide. For more information on editing network scripts by hand, see the chap-
ter titled Network Scripts in the Official Red Hat Linux Reference Guide. For the remainder of the
chapter, example alterations to network interfaces are made either manually or through the Piranha
Configuration Tool.
General LVS Networking Tips
Configure the real IP addresses for both the public and private networks on the LVS routers before
attempting to configure the cluster using the Piranha Configuration Tool. The sections on each to-
pography give example network addresses, but the actual network addresses are needed. Below are
some useful commands for bringing up network interfaces or checking their status.
Bringing Up Real Network Interfaces
The best way to bring up any real network interface is to use the following commands as root
replacing N with the number corresponding to the interface (eth0 and eth1):
/sbin/ifup eth N
Chapter 8:Setting Up a Red Hat Enterprise Linux AS LVS Cluster
Important