OpenNebula Installation on CentOS 5.5
Prerequisites
You need to enable EPEL repo for installing some packages, e.g. rubygems. See Fedora project
wiki on how to enable this.
http://www.thegeekstuff.com/2012/06/enable-epel-repository/
Step 1: Install required packages using yum
sudo yum -y install glibc glibc-common glibc-devel cpp glibc-headers kernelheaders libgomp libstdc++-devel nscd gcc-c++ rpm-build yum-utils pkgconfig
sudo yum -y install libxml2 libxml2-devel expat expat-devel libxslt libxsltdevel openssl openssl-devel curl curl-devel
sudo yum -y install ruby ruby-libs ruby-devel ruby-irb ruby-docs ruby-rdoc
ruby-ri rubygems cmake
Step 2: Install sqlite db from source
wget http://www.sqlite.org/sqlite-amalgamation-3.6.17.tar.gz -P /tmp
sudo tar xvzf /tmp/sqlite-amalgamation-3.6.17.tar.gz -C /usr/local/src
pushd /usr/local/src/sqlite-3.6.17/
sudo ./configure
sudo make
sudo make install
popd
Now we have to install the ruby bindings for sqlite. Unfortunately SL has poor support for ruby. First
install ruby-rdoc
yum install ruby-rdoc
Download and install rubygems, ruby's package management tool from EPEL (Fedora packages ported to
RHEL)
# wget http://download.fedora.redhat.com/pub/epel/5/i386/rubygems-1.3.11.el5.noarch.rpm
# rpm -i rubygems-1.3.1-1.el5.noarch.rpm
Finally download and install the bindings themselves
# wget http://download.fedora.redhat.com/pub/epel/5/i386/rubygem-sqlite3ruby-1.2.4-1.el5.i386.rpm
# rpm -i rubygem-sqlite3-ruby-1.2.4-1.el5.i386.rpm
Step 3: Install xmlrpc
mkdir -p /usr/local/src
cd /usr/local/src
wget http://downloads.sourceforge.net/project/xmlrpc-c/Xmlrpcc%20Super%20Stable/1.16.35/xmlrpc-c-1.16.35.tgz
tar xvzf xmlrpc-c-1.16.35.tgz
cd xmlrpc-c-1.16.35
./configure
make
make install
wget -P /tmp http://centos.karan.org/el5/extras/testing/SRPMS/xmlrpc-c1.06.18-1.el5.kb.src.rpm
rpmbuild --rebuild /tmp/xmlrpc-c-1.06.18-1.el5.kb.src.rpm
sudo yum -y --nogpgcheck localinstall /usr/src/redhat/RPMS/x86_64/xmlrpc-c*.rpm
yum install xmlrpc-c-devel.
yum install curl-devel gsm-devel git yasm subversion gcc gcc-c++ automake
autobuild libtool
yum install libxml2-devel
Install the rpms
# rpm -i xmlrpc-c-1.06.18-1.el5.kb.i386.rpm
Step 4: Install scons
wget -P /tmp http://prdownloads.sourceforge.net/scons/scons-2.0.11.noarch.rpm
sudo yum -y --nogpgcheck localinstall /tmp/scons-2.0.1-1.noarch.rpm
Step 5: Install RVM
http://www.betaquest.com/2011/07/how-to-install-rvm-ruby-version-manager-andruby-1-8-7-and-1-9-2-ree-on-centos-5-6-64bit/
Step 6: Install gems
sudo gem install nokogiri rake xmlparser
Step 7: Add oneadmin user
sudo /usr/sbin/useradd -u50000 oneadmin
Step 8: User Accounts
Add an one user to run OpenNebula and note the uid and the gid
# useradd one
# id one
Passwordless ssh must be set up for one. As one generate a key pair. Use the default key location and
press enter when asked for a pass phrase.
# su one
$ ssh-keygen -t rsa
$cp ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
Step 9: Create OpenNebula install directory
sudo mkdir -p /srv/cloud/one
sudo chown -R oneadmin:oneadmin /srv/cloud
sudo chown -R oneadmin:oneadmin /tmp/opennebula-2..0.1
Step 10: Download and install OpenNebula
wget -P /tmp http://dev.opennebula.org/attachments/download/264/opennebula2.0.1.tar.gz
pushd /tmp
tar xvzf opennebula-2.0.1.tar.gz
pushd opennebula-2.0.1
scons
./install.sh -u oneadmin -g oneadmin -d /srv/cloud/one
popd
popd
Step 11: Configure shell environment
Add following to ~/.bashrc file
cat >>
# User
export
export
export
export
EOF
source
$HOME/.bashrc <<\EOF
specific aliases and functions
ONE_LOCATION=/srv/cloud/one
ONE_AUTH=$HOME/.one_auth
ONE_XMLRPC=http://localhost:2633/RPC2
PATH=/srv/cloud/one/bin:$PATH
~/.bashrc
Step 12: Add username and password to ONE_AUTH file
We need to create an account using $ONE_AUTH file – specifying username and password
separated by a colon ‘:’. The first account created will run as an administrator account.
echo "oneadmin:secretpassword" >> $ONE_AUTH
Step 13: Start OpenNebula as ‘oneadmin’ system user
one start
Step 14: Start the OpenNebula daemon
$ $ONE_LOCATION/bin/one start
oned and scheduler started
Step 15: Start Up Script
Add the following to /home/one/.bash_profile
ONE_LOCATION=/usr/local/one/
ONE_XMLRPC=http://localhost:2633/RPC2
PATH=$ONE_LOCATION/bin:$PATH:$HOME/bin
export PATH
export ONE_LOCATION
export ONE_XMLRPC
Create /etc/init.d/one with the following
#!/bin/sh -e
# chkconfig: 2345 20 80
# description: Starts the OpenNebula service
case "$1" in
start)
su - one /usr/local/one/bin/one start
;;
stop)
su - one /usr/local/one/bin/one stop
;;
restart)
su - one /usr/local/one/bin/one stop
su - one /usr/local/one/bin/one start
;;
*)
echo "Usage: one {start|stop|restart}" >&2
exit 1
;;
esac
exit 0
Mark /etc/init.d/one as an executable
chmod +x /etec/init.d/one
Add to services started at boot
chkconfig --add one
Step 16: Firewall Settings for XMLRPC Acess
Add the following lines to /etc/sysconf/iptables to allow remote RPC control
-A RH-Firewall-1-INPUT -p udp -m udp --dport 2633 -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m tcp --dport 2633 -j ACCEPT
Worker Nodes
Software Requirements

ruby >= 1.8.5
Ruby is available via yum.
# yum install ruby
Step 17: User Accounts
Add an one user to run OpenNebula with the same uid and gid as the head node
# groupadd -g 500 one
# useradd -g 500 -u 500 one
Set up passwordless ssh by copying over the head node's public key
#su one
$ cd
$ scp root@ugdev05:/home/one/.ssh/id_rsa.pub .
$ cat id_rsa.pub >> .ssh/authorized_keys
$ rm id_rsa.pub
$ chmod 600 .ssh/authorized_keys
The one account need sudo access to some of the xen commands. Add the following to /etc/sudoers
## OpenNebula access to the Xen commands
one
ALL=(ALL)
NOPASSWD: /usr/sbin/xm *
one
ALL=(ALL)
NOPASSWD: /usr/sbin/xentop *
Comment out the following line in /etc/sudoers
Defaults
requiretty
Step 18: Set Up
On the head node add the worker node to OpenNebula
$ onehost create ugdev06 im_xen vmm_xen tm_ssh
Create an $ONE_LOCATION on the worker node and change it ownership to one
# mkdir /usr/local/one
# chown one:one /usr/local/one
Step 19: Xen Setup
This is assuming Xen is not set up on the worker node
Install the Xen kernel
yum install kernel-xen
Reboot
# reboot
Install the xen package to provide the Xen daemon
yum install xen
Comment out the non xen kernel in /boot/grup/menu.lst
The scheduler counts the memory assigned to dom0 as used when considering whether to run a VM on
a machine. You need to lower the amount of memory used by the dom0 with xm mem-set 0 256. Do not
set it lower than 256 MB! Besides
Step 20: Networking
OpenNebula needs to have some sort of virtual network set up. This creates machines with IP addresses
in the range 10.0.1.0 - 10.0.1.254 with MAC adresses of the form 00:03:0a:00:01:01. However the ip
address supplied is not the one which the VM boots with as our VMs use DHCP to acquire a ip address.
Save the following in test.net
NAME = "test"
TYPE = RANGED
BRIDGE = xenbr0
NETWORK_SIZE = C
NETWORK_ADDRESS = 10.0.1.0
Create this network with the following command
onevnet create test.net