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From Marty Sweet <msweet....@gmail.com>
Subject CS-Management HA Networking
Date Tue, 22 Oct 2013 20:39:44 GMT
Hi Guys.

I am planning on upgrading my 4.1.1 infrastructure to 4.2 over the weekend.

When testing my 4.1.1 setup I ran across a problem where a TOR switch
failure would cause an outage to the management server. The agents use 2
NICs for all management traffic using bonds.
When I tried to configure the management server to use a bond0 in simple
active-passive mode (like I use for my agent management network),
cloudstack-management would not start due to 'Integrity Issues', which at
the time I located back to a IntegitryChecker which ensures the interfaces
of eth* em* or some others were taking the IP of management server.

My question is does this limitation still exist and if so, can it be
overcome by adding bond* to the list of allowed interface names and
compiling the management server from source?
I would love to hear input to this, it seems bizarre to me that it is
difficult to add simple but effective network redundancy to the management
server.

For scenario basis, this is the basic redundant network setup I have for my
Agents:
4x KVM Hosts all with 4 NICs - 2 bonds (Private/Public Traffic)

Example Host:
------------------Interconnect---------------
      TOR 1      ---------      TOR 2
---------------------          ---------------------
          |      Management      |
          |     Tagged VLANs    |
----------------------------------------------------
       KVM Cloudstack Hypervisor
----------------------------------------------------
          |      Public Traffic         |
          |      Tagged VLANS     |
          |      LACP Aggregation |
----------------------------------------------------
                Core Router
----------------------------------------------------

There are also LACP links with STP rules between the TOR switches are the
core device to allow for interconnect failure so the TORs do not become
isolated, but I have excluded that for simplicity.


I would have thought it would be easy to create a bond for my management
node and connect the two NICs to both the TOR switches, but that didn't
work in 4.1.1 due to my reasons above.

Thanks!
Marty

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