If you have devices that obtain addresses via DHCP and would like to make those addresses static, one way to do it would be to add your own, manually-created leases to "/var/lib/dhcpd/dhcpd.leases"
You could either hand-edit the file (make sure that dhcpd is not running when you edit it), or use "omshell" (see man page) to add DHCP lease objects to the running dhcpd daemon process. Running 'makedhcp -n' will only update the dhcp configuration file in /etc, so the leases file should be safe. I would make a copy of the working configuration after you have it all setup correctly. If you want xCAT to manage the leases you would need to have a separate network object (defines the subnet and dhcp range), then manually add the node objects using their MAC addresses and set the IP address on the node object. You would run 'makedhcp <node>' to make the leases in the lease file. Under the hood, xCAT just runs "omshell" to add the leases. You could leave the node objects as basic as possible. You could also set the chain value to 'boot' to ensure that nothing funny happens with regard to discovery. You may have to experiment a little to get it just right. Of course, the MN should have an address in each of the networks. Ensure that the 'dhcpinterfaces' field in the 'site' table has a valid interface name for each of the networks. Be sure to run 'makedhcp -n' after adding the network object and updating 'dhcpinterfaces'. > On 07/06/2020 10:10 AM Daniel Hilst via xCAT-user > <xcat-user@lists.sourceforge.net> wrote: > > > Thanks Russ, > > This surely helps to get devices in an isolated network but my question > is, if I want to assign them specific IP addresses I still need to create > node objects, and assign IP and mac addresses to this node objects right? > > Regards > > > --------------------------------------------- > De: Russ Auld <russa...@comcast.net> > Enviado: domingo, 5 de julho de 2020 11:42 > Para: xCAT Users Mailing list <xcat-user@lists.sourceforge.net> > Assunto: Re: [xcat-user] What is the right way to add new DHCP client to > xCAT that is not a node nor a switch > > xCAT will serve DHCP leases to the network segment used by your compute > nodes. Check the man page for 'networks'. If you want the extra devices to be > in a separate network segment, you can create another network xCAT object. > You set the address range on the network object. > Then 'makedhcp' will rebuild the dhcp files will the correct address > ranges. > > > > On 06/23/2020 12:42 PM Daniel Hilst via xCAT-user > <xcat-user@lists.sourceforge.net> wrote: > > > > > > Hi, > > > > I need to get some peripherals to get IP from DHCP that runs in the > > headnode. My guess is that I should not edit dhcpd.conf because it will be > > overwritten by `makedhcp -n`. I look at the node manual (man node) and see > > that there is no "other" option in nodetype attribute. > > > > So how to add clients (I want they to have fixed address based on > > MAC) that are not nodes nor switches, to xCAT dhcpd? > > > > Regards, > > _______________________________________________ > > xCAT-user mailing list > > xCAT-user@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/xcat-user > > > > > _______________________________________________ > xCAT-user mailing list > xCAT-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/xcat-user >
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