Synnefo » snf-ganeti

1. Implement functions into gnt-cluster and gnt-node to manage Open vSwitch through Ganeti.

   It should be possible to create, modify and delete vSwitches. The resulting configuration

   shall automatically be done on all members of the node group, if possible. Connecting Ethernet 

   devices to vSwitches should be managed through this interface as well.

Automatic configuration of OpenvSwitches

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Ideally, the OpenvSwitch configuration should be done automatically.

This needs to be done on node level, since each node can be individual and a setting on cluster / node group

level would be too global is thus not wanted. 

The task that each node needs to do is:

  ``ovs-vsctl addbr <switchname>`` with <switchname> defaulting to constants.DEFAULT_OVS

  ``ovs-vsctl add-port <switchname> <ethernet device>`` optional: connection to the outside

This will give us 2 parameters, that are needed for the OpenvSwitch Setup:

  switchname: Which will default to constants.DEFAULT_OVS when not given

  ethernet device: Which will default to None when not given, might be more than one (NIC bonding)

These parameters should be set at node level for individuality, _but_ can have defined defaults on cluster

and node group level, which can be inherited and thus allow a cluster or node group wide configuration.

If a node is setup without parameters, it should use the settings from the parent node group or cluster. If none

are given there, defaults should be used.

As a first step, this will be implemented for using 1 ethernet device only. Functions for nic bonding will be added

later on.

NIC bonding

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To be done