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Hi Simon/Roman/Jacob,
     I was reading your thread about Network node HA and even i wanted the
same thing to setup in our environment,But Am little confused as you guys
were talking about only three components (i.e quantum-dhcp-agent,
quantum-ovs-plugin-agent (i believe this is referred as L2 agent in the
thread), Quantum-L3-agent). There is one more daemon running
"quantum-metadata-agent" in network node, How do we achieve HA for it?

Apart from DHCP and L3 agent, can we have keepalived or pacemaker (just
switching the VIP or active/passive) for quantum-ovs-plugin-agent &
quantum-metadata-agent.?

Also for "Quantum L3 agent" will the telekomcloud solution work with
Openvswitch along with Vlan ? Also apart from VM internet connectivity what
are the other impacts when we do not have HA for L3 agent (i hope VM
instance will be accessible over the LAN even if L3 agent is down and if we
have the gateway of VM instance pointing to physical router or firewall
still we can achieve internet connectivity  ) ?

Thanks & Regards,
Premsudhan Christopher.


On Tue, Jul 23, 2013 at 5:24 PM, Jacob Godin <jacobgodin at gmail.com> wrote:

> Not specifically to Neutron HA, but a great video none the less:
> http://www.youtube.com/watch?v=N9mPepfxm-4
>
>
> On Fri, Jul 19, 2013 at 11:09 AM, Roman Podolyaka <rpodolyaka at mirantis.com
> > wrote:
>
>> Hi all,
>>
>> Thanks, Akihiro and Simon! I didn't know we had such option.
>>
>> >> Regarding 1, the configuration option "dhcp_agents_per_network" is
>> introduced. This options specifies the number of DHCP agents scheduled to
>> host a network.
>> >> If you set this option to the number of dhcp agents, you can do this.
>>
>> >> It already exists in Havana by setting the dhcp_agents_per_network
>> parameter in neutron.conf .
>> >> Check this commit for details:
>> https://github.com/openstack/neutron/commit/c95e58b70796eae6bbc8bac283f81df9aa1d1894
>>
>>
>> On Fri, Jul 19, 2013 at 4:35 PM, Simon Pasquier <simon.pasquier at bull.net>wrote:
>>
>>>  Le 19/07/2013 15:07, Roman Podolyaka a écrit :
>>>
>>> Hi Jacob, all
>>>
>>>  1. When a new Neutron network is created, it is automatically
>>> scheduled to one of DHCP-agents running in a cluster (actually, it's done
>>> lazily, when the first port on this network is created, but that's an
>>> implementation detail). Though, you have to manually schedule it to
>>> additional DHCP-agents to provide HA. I haven't seen any BPs adding such an
>>> option, but I agree, that it would be useful to have one.
>>>
>>>
>>> It already exists in Havana by setting the dhcp_agents_per_network
>>> parameter in neutron.conf .
>>> Check this commit for details:
>>>
>>> https://github.com/openstack/neutron/commit/c95e58b70796eae6bbc8bac283f81df9aa1d1894
>>>
>>>
>>>  2. Not sure we have one :( The solution from TelekomCloud guys seems
>>> to be the only way to go to provide HA for L3 agents in Active/Active mode
>>> currently.
>>>
>>>  3. Every network or compute node in a cluster runs an L2-agent, which
>>> allows one to create L2 tenant networks and plug VMs/routers/DHCP-servers
>>> into network ports (the underlying implementation depends on the core
>>> plugin you use, e.g. OVS can use VLANs or GRE tunnels to provide tenant
>>> isolation). So L2 networking is ready to use when you've started an
>>> L2-agent and provided it with a correct configuration file.
>>>
>>>  Thanks,
>>> Roman
>>>
>>>
>>> _______________________________________________
>>> OpenStack-operators mailing listOpenStack-operators at lists.openstack.orghttp://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators
>>>
>>>
>>>
>>> --
>>> Simon Pasquier
>>> Software Engineer
>>> Bull, Architect of an Open World
>>> Phone: + 33 4 76 29 71 49http://www.bull.com
>>>
>>>
>>> _______________________________________________
>>> OpenStack-operators mailing list
>>> OpenStack-operators at lists.openstack.org
>>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators
>>>
>>>
>>
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-- 
Warm Regards ,

Premsudhan.J
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