The problem is the Cobbler will force the node to boot to bootstrap if he doesn't recognize it via known MAC. Here are the boot process diagrams. The right one: # node's embedded PXE software starts a boot-up procedure via eht0 # Cobbler knows eth0 MAC and puts to the node a PXE config to download and run an installation image (CentOS) # The node goes to the provisioning state.
The bad one: # node runs PXE procedure over eth1 # Cobbler doesn't know eth1 MAC and sends to the node a PXE config with a bootstrap image. # the node boots into bootstrap and an installation process fails. On Mon, Jan 27, 2014 at 9:25 AM, Matthew Mosesohn <[email protected]>wrote: > Andrey, > > We can use the same tactic we use in Ubuntu to ensure that CentOS > starts installing on the correct MAC by adding the kernel parameter > ks.device=$MACADDR. It will try to DHCP on that interface and > eliminate the possibility of having 2 or more NICs on the same subnet > as the PXE server. > > On Mon, Jan 27, 2014 at 9:14 AM, Andrey Danin <[email protected]> wrote: > > There is a little chance that a node will boot up via another interface > and > > Cobbler will put it to the bootstrap stage instead of the target stage. > We > > have to provide all MAC addresses of a node to Cobbler but it can't use > one > > IP for all MACs. So we have to allocate a lot of IPs. > > > > We can improve our mechanism by the following: > > * Assign IP to the node's admin interface only. Use it as a default > > behavior but add an UI switch to enable a greedy behavior. > > * Run a predeployment DHCP check in order to find all interfaces which > > really can communicate with PXE network and assign IPs to these > interfaces > > only. > > > > > > > > On Thu, Jan 23, 2014 at 12:29 AM, Ryan Moe <[email protected]> wrote: > >> > >> What is the reasoning behind assigning an IP from the admin network to > all > >> interfaces [1]? It has caused problems in deployments where IPs are > tightly > >> managed and/or machines have a large number of interfaces. > >> > >> Thanks, > >> Ryan > >> > >> [1] > >> > https://github.com/stackforge/fuel-web/blob/master/nailgun/nailgun/task/helpers.py#L435 > >> > >> -- > >> Mailing list: https://launchpad.net/~fuel-dev > >> Post to : [email protected] > >> Unsubscribe : https://launchpad.net/~fuel-dev > >> More help : https://help.launchpad.net/ListHelp > >> > > > > > > > > -- > > Andrey Danin > > [email protected] > > skype: gcon.monolake > > > > -- > > Mailing list: https://launchpad.net/~fuel-dev > > Post to : [email protected] > > Unsubscribe : https://launchpad.net/~fuel-dev > > More help : https://help.launchpad.net/ListHelp > > > -- Andrey Danin [email protected] skype: gcon.monolake
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