xCAT is designed to support multiple networks, your plan below should work
fine.
The basic process for your situation is:
1.) Configure your new VLANs on the switch.
2.) Add the new virtual interface on the management node.
3.) Add the new network definition for the new virtual interface to the
xCAT networks table. makenetworks -d will give you a stanza you can start
with, then modify to match your desired configuration and add to the table.
4.) Add the new virtual interface name to dhcpinterfaces in the site table.
5.) Run "makedhcp -n" to generate a new dhcpd configuration that includes
the new network.
6.) Add your new node object definitions with mac addresses to xCAT using
your preferred method.
7.) "makedhcp -a" or "makedhcp <NODE_RANGE_OF_NEW_NODES>" will add the
entries for the new nodes to the dhcpd configuration.
> Will the mgmt. node support it with 2 DHCP servers?
The management node only runs one DHCP server, but it will be configured to
operate on all interfaces defined in dhcpinterfaces, using information from
the networks table.
From: Imam Toufique <techie...@gmail.com>
To: xCAT Users Mailing list <xcat-user@lists.sourceforge.net>
Date: 03/16/2021 10:58 PM
Subject: [EXTERNAL] [xcat-user] can xcat serve 2 networks from a single
mgmt. node?
Hi,
Currently we have one network defined in my mgmt. node, and we are
almost running out of IP addresses. I would like to add another network,
so we can build more nodes. My goal here is to use the same mgmt. node -
and its internal DNS server , etc. .
A quick dump of networks table ( tabdump networks), looks like this:
#netname,net,mask,mgtifname,gateway,dhcpserver,tftpserver,nameservers,ntpservers,logservers,dynamicrange,staticrange,staticrangeincrement,nodehostname,ddnsdomain,vlanid,domain,mtu,comments,disable
"compute_net_1","10.240.58.0","255.255.254.0","eno1","10.240.58.1",,"<xcatmaster>","10.240.58.4,8.8.8.8,128.200.192.202",,,"10.240.58.221-10.240.58.240","10.240.58.4-10.240.58.220",,,,,"local","1500",,
....
....
....
I would like to add another network there , for example, 10.240.68.x/23 .
current mgmt. node physical NIC config, looks like this:
4: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group
default qlen 1000
link/ether e4:43:4b:53:0b:f0 brd ff:ff:ff:ff:ff:ff
inet 10.240.58.4/23 brd 10.240.59.255 scope global eno1
valid_lft forever preferred_lft forever
inet6 fe80::e643:4bff:fe53:bf0/64 scope link
valid_lft forever preferred_lft forever
If I tagged a vlan on switchport, and created a virtual interface in the
mgmt. node, can I add another network in the network table? Will the mgmt.
node support it with 2 DHCP servers? I am not sure how this process might
work. I am rather thinking that xcat DHCP server could offer a DHCP address
from the new network.
I might be completely off in my thought process. My only goal is to create
a new network so I can build more nodes.
Appreciate any feedback.
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