Dan,
On similar lines - Currently if nova-network processes are running on two
nodes, only way to set specific network on specific nova-network node is to
execute "nova-manage network create" on respective nova-network node. Is that
correct ?
How is the above setup related to "multi-host" ? I found a code comment that
"Quantum Manager doesn't support multi-host"
I'm copying Vish, as he seems to be expert on multi-host - Reading
http://docs.openstack.org/trunk/openstack-compute/admin/content/existing-ha-networking-options.html
, it looks like above is Option 2/Multi-Nic, but not really sure) If yes, how
is multi-nic supported by Quantum ?
Additionally - in the above document Vish suggested that each nova-compute must
run nova-network - Is that why with QuantumManager - nova-manage executes
networking commands like iptables, dnsmasq locally ?
Thanks !!
-Mandar
From: Dan Wendlandt [mailto:d...@nicira.com]
Sent: Thursday, April 12, 2012 9:44 PM
To: Vaze, Mandar
Cc: openst...@lists.launchpad.net; netstack@lists.launchpad.net
Subject: Re: [Netstack] Role of "nova-manage network" commands when using
QuantumManager
Hi Mandar,
Thanks for bringing this up. For Essex, nova-manage commands to create/delete
Quantum networks must be run on the nova-network node. For Folsom this will
all change, as all networks will be created directly against the Quantum API,
rather than using nova-manage. I'll add a note to the administrator guide, as
this is not called there. Thanks!
Dan
On Thu, Apr 12, 2012 at 1:38 AM, Vaze, Mandar
<mandar.v...@nttdata.com<mailto:mandar.v...@nttdata.com>> wrote:
It is my understanding that in multi-node setup :
* nova-manage can be executed from any machine which may not be running
nova-network process. (Or should nova-manage always be run on nova-network
node ?)
* nova-manage does DB operations and delegates the actual networking
calls to nova-network process ?
Is this understanding correct ?
I traced "nova-manage network create" and nova-manage network delete" using
FlatDHCPManager (default for devstack/stack.sh)
Both these calls seem to be doing only DB operations.
BTW, nova-network process was shutdown during both "network create" and
"network delete" - Still both operations were successful.
But when using QuantumManager as network manager - nova-manage seems to be
doing networking operations like "iptables-save" (during network create) and
"kill_dhcp" (during network delete)
(via linux-net L3 driver)
Since nova-manage command may be executed on a host which isn't running
nova-network - network commands like "iptables" and "kill -9 <pid of dnsmasq>"
on host running nova-manage seems incorrect.
For the first scenario (iptables-save during "network create" - there is
already a defect in LP : https://bugs.launchpad.net/nova/+bug/977738
and review : https://review.openstack.org/6451
I would like your comments and opinions which would help me understand "What
nova-manage should and should NOT do"
Thanks,
-Mandar
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