Red Hat LINUX VIRTUAL SERVER 4.7 - ADMINISTRATION Przewodnik Instalacji Pobierz pdf (Strona 28)

DEVICE=eth0

BOOTPROTO=static

ONBOOT=yes

IPADDR=192.168.26.9

NETMASK=255.255.255.0

GATEWAY=192.168.26.254

The /etc/sysconfig/network-scripts/ifcfg-eth1 for the private NAT interface on the LVS

router could look something like this:

DEVICE=eth1

BOOTPROTO=static

ONBOOT=yes

IPADDR=10.11.12.9

NETMASK=255.255.255.0

In this example, the VIP for the LVS router's public interface will be 192.168.26.10 and the VIP for the

NAT or private interface will be 10.11.12.10. So, it is essential that the real servers route requests back

to the VIP for the NAT interface.

Important

The sample Ethernet interface configuration settings in this section are for the real IP addresses

of an LVS router and not the floating IP addresses. To configure the public and private floating IP

addresses the administrator should use the Piranha Configuration Tool, as shown in

Section 4.4, “GLOBAL SETTINGS” and Section 4.6.1, “T he VIRTUAL SERVER Subsection”.

After configuring the primary LVS router node's network interfaces, configure the backup LVS router's

real network interfaces — taking care that none of the IP address conflict with any other IP addresses on

the network.

Important

Be sure each interface on the backup node services the same network as the interface on

primary node. For instance, if eth0 connects to the public network on the primary node, it must

also connect to the public network on the backup node as well.

3.1.2. Routing on the Real Servers

The most important thing to remember when configuring the real servers network interfaces in a NAT

topology is to set the gateway for the NAT floating IP address of the LVS router. In this example, that

address is 10.11.12.10.

Note

Once the network interfaces are up on the real servers, the machines will be unable to ping or

connect in other ways to the public network. This is normal. You will, however, be able to ping the

real IP for the LVS router's private interface, in this case 10.11.12.8.

So the real server's /etc/sysconfig/network-scripts/ifcfg-eth0 file could look similar to this:

Chapter 3. Setting Up LVS

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Red Hat LINUX VIRTUAL SERVER 4.7 - ADMINISTRATION Przewodnik Instalacji Strona 28