Before you install the packages (or shortly thereafter), there are some prerequisites that should be satisfied to end up with a fully functioning Eucalyptus system.

• On each node, configure the system's primary ethernet interface as a bridge. (See the Ubuntu Server Guide Bridging for details). The node controller will attach virtual network interfaces to this bridge for VM that is started before it to enable network connectivity.
  Note: Remember the name of your node's bridge device (we assume the name of your bridge device is "br0" for the rest of this document).

• The default Eucalyptus configuration assumes that there is not a DHCP server in your environment that is handing out dynamic IP addresses. The Cluster Controller runs a dhcp server that will statically assign IP addresses to VMs (which will be bridged on the local network).

• From any host that you wish to use as a Eucalyptus client, you should install the euca2ools package from universe:

  $ sudo apt-get install euca2ools

  Also, other tools that can interact with the EC2 and S3 APIs should work with Eucalyptus.

• If you wish to access Eucalyptus from behind a firewall (i.e. the euca2ools tools and the cloud controller will be on different sides of a firewall) then port 8773 must be open on the cloud controller. Additionally, if you plan to register your Eucalyptus installation with a cloud management platform, 8773 and 8443 must be open.