As I have seen very large deployments still on nova networks Inviato da iPhone
> Il giorno 07/mag/2015, alle ore 12:56, BYEONG-GI KIM <[email protected]> > ha scritto: > > Dear Joe > > Thank you very much for the reply! > > The answer is very helpful for me to understand what multi-host mode of > nova-network exactly provides. By the way, in aspect of reliability, > robustness and fault-tolerance for networking service on OpenStack, > nova-network still seems better than neutron, the neutron provides lots of > useful networking features though. I'd like to hear comments about this. > > I'm now mainly focusing on analyzing how much high-availability can be > guaranteed by each networking service type. I know the latest neutron > provides distributed L3 service, i.e., DVR (Distributed Virtual Router) and > can give high-availability via Pacemaker or something like that, but I'm not > sure this can be said that the neutron is obviously better than nova-network > in terms of the service continuity. > > Regards > > Byeong-Gi > > 2015-05-08 0:56 GMT+09:00 Joe Topjian <[email protected]>: >> Hello, >> >> If the nova-network service is down, then only actions that would involve >> nova-network (creating and terminating instances for example) won't work. >> Instances that are already running will still be able to communicate with >> both the outside network and other instances in the cloud. >> >> You can easily test this by just stopping the nova-network service on the >> compute node (assuming you have a window where no one will be launching >> instances). >> >> multi-host provides continuity in that each compute node becomes a network >> gateway for the instances hosted on that node. If that compute node is >> physically down, instances on all other compute nodes can still have >> external network access. >> >> Contrast this with single-host networking where all traffic is routed >> through the single host. (Again, nova-network does not need to be running on >> that single host for traffic to still get out.) But if that single host is >> physically down, then *no* instances in your cloud have external network >> access. >> >> Hope that helps, >> Joe >> >>> On Thu, May 7, 2015 at 1:08 AM, BYEONG-GI KIM <[email protected]> wrote: >>> Hello. >>> >>> It seems that this question would be quite outdated question, because this >>> is a question about nova-network instead of neutron. >>> >>> I wonder whether VMs located in a Compute Node, e.g., Compute A, are >>> accessible while its nova-network service is down if the other nova-network >>> is running on the other Compute Nodes, such as Compute B, Compute C, etc. >>> >>> Or, does the multi-host just provide continuity of the networking service >>> via avoiding single point failure? >>> >>> Thanks in advance! >>> >>> Regards, >>> Byeong-gi >>> >>> __________________________________________________________________________ >>> OpenStack Development Mailing List (not for usage questions) >>> Unsubscribe: [email protected]?subject:unsubscribe >>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev > > !DSPAM:1,554bc4d313714275170572! > _______________________________________________ > Mailing list: http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack > Post to : [email protected] > Unsubscribe : http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack > > > !DSPAM:1,554bc4d313714275170572!
_______________________________________________ Mailing list: http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack Post to : [email protected] Unsubscribe : http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
