How To Set Up A Loadbalanced High-Availability Apache Cluster Based On Ubuntu 8.04 LTS - Page 2
5 Edit /etc/apt/sources.list And Update Your Linux Installation
Edit /etc/apt/sources.list. Comment out or remove the installation CD from the file and make sure that the universe and multiverse repositories are enabled. It should look like this:
vi /etc/apt/sources.list
# # deb cdrom:[Ubuntu-Server 8.04 _Hardy Heron_ - Release i386 (20080423.2)]/ hardy main restricted #deb cdrom:[Ubuntu-Server 8.04 _Hardy Heron_ - Release i386 (20080423.2)]/ hardy main restricted # See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to # newer versions of the distribution. deb http://de.archive.ubuntu.com/ubuntu/ hardy main restricted deb-src http://de.archive.ubuntu.com/ubuntu/ hardy main restricted ## Major bug fix updates produced after the final release of the ## distribution. deb http://de.archive.ubuntu.com/ubuntu/ hardy-updates main restricted deb-src http://de.archive.ubuntu.com/ubuntu/ hardy-updates main restricted ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu ## team, and may not be under a free licence. Please satisfy yourself as to ## your rights to use the software. Also, please note that software in ## universe WILL NOT receive any review or updates from the Ubuntu security ## team. deb http://de.archive.ubuntu.com/ubuntu/ hardy universe deb-src http://de.archive.ubuntu.com/ubuntu/ hardy universe deb http://de.archive.ubuntu.com/ubuntu/ hardy-updates universe deb-src http://de.archive.ubuntu.com/ubuntu/ hardy-updates universe ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu ## team, and may not be under a free licence. Please satisfy yourself as to ## your rights to use the software. Also, please note that software in ## multiverse WILL NOT receive any review or updates from the Ubuntu ## security team. deb http://de.archive.ubuntu.com/ubuntu/ hardy multiverse deb-src http://de.archive.ubuntu.com/ubuntu/ hardy multiverse deb http://de.archive.ubuntu.com/ubuntu/ hardy-updates multiverse deb-src http://de.archive.ubuntu.com/ubuntu/ hardy-updates multiverse ## Uncomment the following two lines to add software from the 'backports' ## repository. ## N.B. software from this repository may not have been tested as ## extensively as that contained in the main release, although it includes ## newer versions of some applications which may provide useful features. ## Also, please note that software in backports WILL NOT receive any review ## or updates from the Ubuntu security team. # deb http://de.archive.ubuntu.com/ubuntu/ hardy-backports main restricted universe multiverse # deb-src http://de.archive.ubuntu.com/ubuntu/ hardy-backports main restricted universe multiverse ## Uncomment the following two lines to add software from Canonical's ## 'partner' repository. This software is not part of Ubuntu, but is ## offered by Canonical and the respective vendors as a service to Ubuntu ## users. # deb http://archive.canonical.com/ubuntu hardy partner # deb-src http://archive.canonical.com/ubuntu hardy partner deb http://security.ubuntu.com/ubuntu hardy-security main restricted deb-src http://security.ubuntu.com/ubuntu hardy-security main restricted deb http://security.ubuntu.com/ubuntu hardy-security universe deb-src http://security.ubuntu.com/ubuntu hardy-security universe deb http://security.ubuntu.com/ubuntu hardy-security multiverse deb-src http://security.ubuntu.com/ubuntu hardy-security multiverse |
Then run
apt-get update
to update the apt package database and
apt-get upgrade
to install the latest updates (if there are any).
6 Disable AppArmor
AppArmor is a security extension (similar to SELinux) that should provide extended security, which usually causes more problems than advantages. Therefore I disable it.
We can disable it like this:
/etc/init.d/apparmor stop
update-rc.d -f apparmor remove
7 Install Apache (Only on the Webservers)
webserver1/webserver2:
apt-get install apache2
8 Enable IPVS On The Load Balancers
First we must enable IPVS on our load balancers. IPVS (IP Virtual Server) implements transport-layer load balancing inside the Linux kernel, so called Layer-4 switching.
loadb1/loadb2:
echo ip_vs_dh >>
/etc/modules
echo ip_vs_ftp >> /etc/modules
echo ip_vs >> /etc/modules
echo ip_vs_lblc >> /etc/modules
echo ip_vs_lblcr >> /etc/modules
echo ip_vs_lc >> /etc/modules
echo ip_vs_nq >> /etc/modules
echo ip_vs_rr >> /etc/modules
echo ip_vs_sed >> /etc/modules
echo ip_vs_sh >> /etc/modules
echo ip_vs_wlc >> /etc/modules
echo ip_vs_wrr >> /etc/modules
Then we do this:
loadb1/loadb2:
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
9 Install Ultra Monkey (packages) On The Load Balancers
Ultra Monkey is a project to create load balanced and highly available services on a local area network using Open Source components on the Linux operating system; the Ultra Monkey package provides heartbeat (used by the two load balancers to monitor each other and check if the other node is still alive) and ldirectord, the actual load balancer.
In the Original article Falko uses Debian and thus there are directly Debian repositories from Ultra Monkey, however as here we are using Ubuntu we will have to install ipvsadm ldirectord heartbeat.
loadb1/loadb2:
apt-get install ipvsadm ldirectord heartbeat
If you see this warning:
¦ libsensors3 not functional ¦ |
you can ignore it, I didn't see it on Ubuntu, but as it was in the original article I though to include it just in case.
