OpenNebula: x86 (CentOS)

Overview

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Download

http://downloads.opennebula.org/opennebula-4.2.0.tar.gz
Select software component as OpenNebula 4.2.0 CentOS tarball

EPEL

wget http://epel.mirror.net.in/epel/6/i386/epel-release-6-8.noarch.rpm
rpm -i epel-release-6-8.noarch.rpm

Install

tar zxf CentOS-6-opennebula-4.2.0-1.tar.gz
cd opennebula-4.2.0-1

Front-end

yum localinstall opennebula-common-4.2.0-1.x86_64.rpm
yum localinstall opennebula-ruby-4.2.0-1.x86_64.rpm
yum localinstall opennebula-4.2.0-1.x86_64.rpm
yum localinstall opennebula-server-4.2.0-1.x86_64.rpm

Hosts

yum localinstall opennebula-common-4.2.0-1.x86_64.rpm
yum localinstall opennebula-node-kvm-4.2.0-1.x86_64.rpm

Virtualisation Driver

KVM

Front-end - Settings

OpenNebula needs to know if it is going to use the KVM Driver. To achieve this, uncomment these drivers in /etc/one/oned.conf:

IM_MAD = [
        name       = "kvm",
        executable = "one_im_ssh",
        arguments  = "-r 0 -t 15 kvm" ]

VM_MAD = [
        name       = "kvm",
        executable = "one_vmm_exec",
        arguments  = "-t 15 -r 0 kvm",
        default    = "vmm_exec/vmm_exec_kvm.conf",
        type       = "kvm" ]

Hosts - Settings

Edit /etc/libvirt/libvirtd.conf

• listen_tls = 0
• listen_tcp = 1
• mdns_adv = 0
• unix_sock_group = "oneadmin"
• unix_sock_rw_perms = "0777"
• auth_unix_ro = "none"
• auth_unix_rw = "none"

Edit /etc/sysconfig/libvirtd

• Set LIBVIRTD_ARGS="--listen"

Start service (Hosts)

service libvirtd start

For issues while starting libvirtd, edit /etc/libvirt/libvirtd.conf, uncomment this line

log_outputs="3:syslog:libvirtd"

After that, try to startup libvirtd once again. This time you can see the problem: /var/log/messages

Secure Shell Access (Front-End)

You need to create ssh keys for the oneadmin user and configure the host machines so it can connect to them using ssh without need for a password.
Follow these steps in the front-end:
Generate oneadmin ssh keys

ssh-keygen
cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys

chmod 700 ~/.ssh/
chmod 600 ~/.ssh/id_rsa.pub
chmod 600 ~/.ssh/id_rsa
chmod 600 ~/.ssh/authorized_keys

Tell ssh client to not ask before adding hosts to known_hosts file. Also it is a good idea to reduced the connection timeout in case of network problems. This is configured into ~/.ssh/config, see man ssh_config for a complete reference.:

cat ~/.ssh/config
ConnectTimeout 5
Host *
    StrictHostKeyChecking no

Copy the front-end /var/lib/one/.ssh directory to each one of the hosts in the same path

Starting OpenNebula (Front-End)

Log in as the oneadmin user follow these steps:

If you installed from packages, you should have the '~/.one/one_auth' file created with a randomly-generated password. Otherwise, set oneadmin's OpenNebula credentials (username and password) adding the following to ~/.one/one_auth (change password for the desired password):

mkdir ~/.one
echo "oneadmin:password" > ~/.one/one_auth
chmod 600 ~/.one/one_auth

Start the OpenNebula daemons:

one start

Verifying the Installation

After OpenNebula is started for the first time, you should check that the commands can connect to the OpenNebula daemon. In the front-end, run as oneadmin the command onevm:

onevm list