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Linux System Administration
book

Linux System Administration

by Tom Adelstein, Bill Lubanovic
March 2007
Intermediate to advanced content levelIntermediate to advanced
304 pages
11h 12m
English
O'Reilly Media, Inc.
Content preview from 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
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Publisher Resources

ISBN: 9780596009526Supplemental ContentCatalog PageErrata