Commit bff04b1b authored by Guido Trotter's avatar Guido Trotter

2.1 design: non bridged instances support

Signed-off-by: default avatarGuido Trotter <ultrotter@google.com>
Reviewed-by: default avatarIustin Pop <iustin@google.com>
parent 76bb661b
......@@ -153,6 +153,39 @@ The parameters will be kept, as for the BEPARAMS into a "default" category,
which will allow us to expand on by creating instance "classes" in the future.
Instance classes is not a feature we plan implementing in 2.1, though.
Non bridged instances support
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Current State and shortcomings
++++++++++++++++++++++++++++++
Currently each instance NIC must be connected to a bridge, and if the bridge is
not specified the default cluster one is used. This makes it impossible to use
the vif-route xen network scripts, or other alternative mechanisms that don't
need a bridge to work.
Proposed changes
++++++++++++++++
The new "mode" network parameter will distinguish between bridged interfaces
and routed ones.
When mode is "bridge" the "link" parameter will contain the bridge the instance
should be connected to, effectively making things as today. The value has been
migrated from a nic field to a parameter to allow for an easier manipulation of
the cluster default.
When mode is "route" the ip field of the interface will become mandatory, to
allow for a route to be set. In the future we may want also to accept multiple
IPs or IP/mask values for this purpose. We will evaluate possible meanings of
the link parameter to signify a routing table to be used, which would allow for
insulation between instance groups (as today happens for different bridges).
For now we won't add a parameter to specify which network script gets called
for which instance, so in a mixed cluster the network script must be able to
handle both cases. The default kvm vif script will be changed to do so. (Xen
doesn't have a ganeti provided script, so nothing will be done for that
hypervisor)
External interface changes
--------------------------
......
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