Linux System Administration

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Chapter 7: Load-Balanced Clusters

On lb, add these lines to /etc/modules.

ip_vs_dh

ip_vs_ftp

ip_vs

ip_vs_lblc

ip_vs_lblcr

ip_vs_lc

ip_vs_nq

ip_vs_rr

ip_vs_sed

ip_vs_sh

ip_vs_wlc

ip_vs_wrr

Then load the modules into the kernel:

# modprobe ip_vs_dh

# modprobe ip_vs_ftp

# modprobe ip_vs

# modprobe ip_vs_lblc

# modprobe ip_vs_lblcr

# modprobe ip_vs_lc

# modprobe ip_vs_nq

# modprobe ip_vs_rr

# modprobe ip_vs_sed

# modprobe ip_vs_sh

# modprobe ip_vs_wlc

# modprobe ip_vs_wrr

To enable packet forwarding in the Linux kernel on lb, edit the file /etc/sysctl.conf

and add this line:

net.ipv4.ip_forward = 1

Then load this setting into the kernel:

# sysctl -p

net.ipv4.ip_forward = 1

ldirectord

Although we could obtain ldirectord on its own, we’ll get it as part of the Ultra Mon-

key package, which includes the heartbeat software for HA. Because Ultra Monkey

isn’t a part of the standard Debian distribution, you’ll need to add these two lines to

your Debian repository file (/etc/apt/sources.list) on the lb machine:

deb http://www.ultramonkey.org/download/3/ sarge main

deb-src http://www.ultramonkey.org/download/3 sarge main

Then update the repository and get the package:

# apt-get update

# apt-get install ultramonkey