On 22/02/12 18:08, Mike Burns wrote: > On Wed, 2012-02-22 at 17:59 +0200, Doron Fediuck wrote: >> On 22/02/12 17:33, Doron Fediuck wrote: >>> On 22/02/12 16:57, Mike Burns wrote: >>>> There has been a lot of interest in being able to run stateless Nodes >>>> with ovirt-engine. ovirt-node has designed a way [1] to achieve this on >>>> the node side, but we need input from the engine and vdsm teams to see >>>> if we're missing some requirement or if there needs to be changes on the >>>> engine/vdsm side to achieve this. >>>> >>>> As it currently stands, every time you reboot an ovirt-node that is >>>> stateless, it would require manually removing the host in engine, then >>>> re-registering/approving it again in engine. >>>> >>>> Any thoughts, concerns, input on how to solve this? >>>> >>>> Thanks >>>> >>>> Mike >>>> >>>> [1] http://ovirt.org/wiki/Node_Stateless >>>> >>> >>> Some points need to be considered; >>> >>> - Installation issues >>> >>> * Just stating the obvious, which is users need >>> to remove-add the host on every reboot. This will >>> not make this feature a lovable one from user's point of view. >>> >>> * During initial boot, vdsm-reg configures the networking >>> and creates a management network bridge. This is a very >>> delicate process which may fail due to networking issues >>> such as resolution, routing, etc. So re-doing this on >>> every boot increases the chances of loosing a node due >>> to network problems. >>> >>> * CA pollution; generating a certificate on each reboot >>> for each node will create a huge number of certificates >>> in the engine side, which eventually may damage the CA. >>> (Unsure if there's a limitation to certificates number, >>> but having hundreds of junk cert's can't be good). >>> >>> * Today there's a supported flow that for nodes with >>> password, the user is allowed to use the "add host" >>> scenario. For stateless, it means re-configuring a password >>> on every boot... >>> >>> - Other issues >>> >>> * Local storage; so far we were able to define a local >>> storage in ovirt node. Stateless will block this ability. >>> >>> * Node upgrade; currently it's possible to upgrade a node >>> from the engine. In stateless it will error, since no where >>> to d/l the iso file to. >>> >>> * Collecting information; core dumps and logging may not >>> be available due to lack of space? Or will it cause kernel >>> panic if all space is consumed? >>> >> >> One more question / thing to consider; >> Currently when you manually install a node, >> you need to configure the management-server's address. >> Will I need to re-do it on every boot of a stateless node? > > As answered in the other response, there are kernel command line > parameters to set the management_server. Since this will likely be in a > pxe environment, setting the pxe profile to include > management_server=<engine_url> should be fine. > I agree it's a valid solution as long as you assume this is relevant for PXE only use case.
> Another solution could be to setup a specific DNS SRV record that points > to the ovirt-engine and have node automatically query that for the > location. This was discussed in the past and for some reason not implemented. > > Mike > > _______________________________________________ > node-devel mailing list > node-de...@ovirt.org > http://lists.ovirt.org/mailman/listinfo/node-devel -- /d "Ford," he said, "you're turning into a penguin. Stop it." --Douglas Adams, The Hitchhiker's Guide to the Galaxy _______________________________________________ vdsm-devel mailing list vdsm-devel@lists.fedorahosted.org https://fedorahosted.org/mailman/listinfo/vdsm-devel
