MySQL is recommended for production deployments. Start by picking an OpenNebula to act as master of the federation.
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The master OpenNebula will be responsible for updating shared information across zones and replicating the updates to the slaves. You may start with an existing installation or with a new one see the installation guide. When installing a new master from scratch be sure to start it at least once to properly bootstrap the database. In the HA setup, the master-ip should be set to the floating IP address, see the HA installation guide for more details.
In single server zones, just use the IP of the server. This example shows how to make a database snapshot with SQLite. This is not required for MySQL.
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Now you can start adding more servers to the slave zone to provide it with HA capabilities. The procedure is the same as the one described for stand-alone zones in the HA installation guide. In this case, the replication works in a multi-tier fashion. The master replicates a database change to one of the zone servers.
Then this server replicates the change across the zone servers. It is important to double check that the federation is working before adding HA servers to the zone, as you will be updating the zone metadata which is a federated information. There is no automatic procedure to import existing users and groups into a running federation.
However, you can preserve everything else like datastores, VMs, networks To federate OpenNebula zones, they must run the same version of the federated tables which are pretty stable. Upgrades to a version that does not increase the federated version can be done asynchronously in each zone. However, an update in the shared table version requires a coordinated update of all zones. A Federation will have a unique oneadmin account. This is required to perform API calls across zones.
When additional access restrictions are needed, the Federation Administrator can create a special administrative group with total permissions for one zone only.
Into the Slave Nebula - Wikipedia
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