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Hi Team,

Could you pleas help us with below questions.

Thanks,
-Vladimir


On May 16, 2011, at 8:50 PM, "Alex Lyakas" <alex at zadarastorage.com> wrote:

> I am trying to achieve a two-node nova installation using FlatDHCP network manager. On node-A, I have two network interfaces: eth0 is connected to public network, while eth1 is unconfigured (just as the administration manual recommends). I start all nova services on node-A. I see that a br100 bridge is created, eth1 is added to that bridge, and the bridge receives an IP address within the project network (which is a part of a fixed range). When I spawn instances on node-A, everything works fine: the instance receives an IP address within the project network, I can ssh into it from within node-A. I can also assign a floating IP within my public network to the instance. Then I am able to ssh into the instance from anywhere.
>  
> On node-B, I have only the nova-compute running. Node-B has also eth0 and eth1 interfaces. Similar to node-A, eth0 has a public address and eth1 is unconfigured. Whenever I spawn an instance on node-B, I see that br100 is also created on node-B, and eth1 is added to it. However, I am unable to ssh into the instance. I am able to connect to the instance via VNC. Then I see that it has not received an IP address (the instance image is configured to use DHCP). I understand that the instance should receive an address from nova-network via DHCP.
>  
> My questions are:
> How the br100 bridge on node-B should connect to br100 on Node-A? Should nova-network connect them somehow, or do I need to do something manually?
> I assume that if br100s were connected on both nodes, things would have worked, but perhaps I am wrong.
> Looking at the code of FlatDHCPManager, I see that in setup_compute_network() method, ensure_bridge() is called without the    ‘net_attrs’ parameter, and so the following code is not executed:
> if net_attrs:
>     # NOTE(vish): The ip for dnsmasq has to be the first address on the
>     #             bridge for it to respond to reqests properly
>     suffix = net_attrs['cidr'].rpartition('/')[2]
>     out, err = _execute('sudo', 'ip', 'addr', 'add',
>                         "%s/%s" %
>                         (net_attrs['gateway'], suffix),
>                         'brd',
>                         net_attrs['broadcast'],
>                         'dev',
>                         bridge,
>                         check_exit_code=False)
>  
> while on the node-A with nova-network, this code is executed, and an entry added to the routing table. I tried to do this code manually on node-B, but still I am unable to ssh into the instance.
>  
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