Description

OpenNebula is an open source virtual infrastructure engine that enables the dynamic deployment and re-placement of virtualized services (groups of interconnected virtual machines) within and across sites. OpenNebula extends the benefits of virtualization platforms from a single physical resource to a pool of resources, decoupling the server not only from the physical infrastructure but also from the physical location.

OpenNebula can be primarily used as a virtualization tool to manage your virtual infrastructure in the data-center or cluster. This application is usually referred as private cloud, and with OpenNebula you can also dynamically scale it to multiple external clouds, so building a hybrid cloud. When combined with a Cloud interface, OpenNebula can be used as engine for public clouds, providing a scalable and dynamic management of the back-end infrastructure. So, do you want to transform your rigid and compartimentalized infrastructure, into a flexible and agile platform where you can dynamically deploy new services and adjust their capacity?. If the answer is yes, you want to build what is nowadays called a private cloud.

Setting up a Private Cloud in 5 steps

In this mini-howto, you will learn to setup such private cloud in 5 steps with Ubuntu and OpenNebula . We assume that your infrastructure follows a classical cluster-like architecture, with a front-end (cluster01, in the howto) and a set of worker nodes (cluster02 and cluster03).

First you’ll need to add the following PPA if you’re running Ubuntu 8.04 LTS (Hardy) or Ubuntu 8.10 (Intrepid), you should be fine if you are running Ubuntu 9.04 (Jaunty Jackalope):

• deb http://ppa.launchpad.net/opennebula-ubuntu/ppa/ubuntu intrepid main

If everything is set up correctly you could see the OpenNebula packages:

• $ apt-cache search opennebula

  libopennebula-dev - OpenNebula client library - Development

  libopennebula1 - OpenNebula client library - Runtime

  opennebula - OpenNebula controller

  opennebula-common - OpenNebula common files

  opennebula-node - OpenNebula node

OK, then. Here we go:

1. [Front-end (cluster01)] Install the opennebula package:
   • $ sudo apt-get install opennebula Reading package lists... Done Building dependency tree Reading state information... Done The following extra packages will be installed:
     • opennebula-common
     The following NEW packages will be installed:
     • opennebula opennebula-common
     0 upgraded, 2 newly installed, 0 to remove and 2 not upgraded. Need to get 280kB of archives. After this operation, 1352kB of additional disk space will be used. Do you want to continue [Y/n]? … Setting up opennebula-common (1.2-0ubuntu1~intrepid1) … … Adding system user `oneadmin’ (UID 107) …

     Adding new user oneadmin’ (UID 107) with group nogroup’ … Generating public/private rsa key pair. … Setting up opennebula (1.2-0ubuntu1~intrepid1) … oned and scheduler started

     As you may see from the output of the apt-get command performs several configuration steps: creates a oneadmin account, generates a rsa key pair, and starts the OpenNebula daemon.

2. [Front-end (cluster01)] Add the cluster nodes to the system. In this case, we’ll be using KVM and no shared storage. This simple configuration should work out-of-the-box with Ubuntu:
   • $ onehost add cluster02 im_kvm vmm_kvm tm_ssh Success!
   • .. $ onehost add cluster03 im_kvm vmm_kvm tm_ssh Success!
   • .. Now, we have just to follow the wise output of the previous commands
3. [Front-end (cluster01)] You need to add the cluster nodes to the known hosts list for the oneadmin user:
   • sudo -u oneadmin ssh cluster02 The authenticity of host 'cluster02 (192.168.16.2)' can't be established. RSA key fingerprint is 37:41:a5:0c:e0:64:cb:03:3d:ac:86:b3:44:68:5c:f9. Are you sure you want to continue connecting (yes/no)? yes Warning: Permanently added 'cluster02,192.168.16.2' (RSA) to the list of known hosts. oneadmin@cluster02's password: You don’t need to actually login.

4. [Worker Node (cluster02,cluster03)] Install the OpenNebula Node package:

   • $ sudo apt-get install opennebula-node Reading package lists... Done Building dependency tree Reading state information... Done The following extra packages will be installed:
     • opennebula-common
     The following NEW packages will be installed:
     • opennebula-common opennebula-node
   • .. Setting up opennebula-node (1.2-0ubuntu1~intrepid1) ...

     Adding user oneadmin' to group libvirtd' ... Adding user oneadmin to group libvirtd Done. Note that oneadmin is also created at the nodes (no need for NIS here) and added to the libvirtd, so it can manage the VMs.

5. [Worker Node (cluster02,cluster03)] Trust the oneadmin user at the ssh scope, just copy the command from the onehost output :

   • $ sudo tee /var/lib/one/.ssh/authorized_keys << EOT > ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAm9n0E4bS9K8NUL2bWh4F78LZWDo8uj2VZiAeylJzct …7YPgr+Z4+lhOYPYMnZIzVArvbYzlc7HZxczGLzu+pu012a6Mv4McHtrzMqHw== oneadmin@cluster01 > EOT

You may want to check that you can login the cluster nodes from the front-end, using the oneadmin account without being asked for a password:

• $ sudo -u oneadmin ssh cluster02

You are done! You have your own cloud up and running! Now, you should be able to see your nodes ready to start VMs:

• $ onehost list
  • HID NAME RVM TCPU FCPU ACPU TMEM FMEM STAT
    • 0 cluster02 0 100 100 100 963992 902768 on 1 cluster03 0 100 100 100 963992 907232 on

You may want to check the OpenNebula documentation for further information on configuring the system or to learn how to specify virtual machines.