Configure Ethernet Network Interface¶

The following example sets the xCAT properties for compute node cn1 to create:

Compute node cn1 with two physical NICs: eth0 and eth1

Management network is 11.1.89.0, application network is 13.1.89.0

The install NIC is eth0, and application NIC is eth1

Assign static ip 11.1.89.7/24 to eth0

Assign static ip 13.1.89.7/24 to eth1

Add/update networks into the xCAT DB¶

Add/update additional networks net11 and net13 into networks table:

chdef -t network net11 net=11.1.89.0 mask=255.255.255.0
chdef -t network net13 net=13.1.89.0 mask=255.255.255.0

Note: MTU can be customized as mtu in networks table for specified network.

Define Adapters in the nics table¶

The install NIC eth0 on the management network will get an IP via DHCP, which will be the value of the ip attribute in the node definition. There is no need to configure install NIC into nics table.
```
chdef cn1 ip=11.1.89.7
```
Application NIC eth1 on the application network is different from install NIC eth0, and will get its IP assigned from the eth1 definition in the nics table
```
chdef cn1 nicips.eth1="13.1.89.7" nicnetworks.eth1="net13" nictypes.eth1="Ethernet" nichostnamesuffixes.eth1=-eth1
```

Update /etc/hosts¶

Run the makehosts command to add the new configuration to the /etc/hosts file.
```
makehosts cn1
```

Check /etc/hosts

cat /etc/hosts
11.1.89.7 cn1 cn1.cluster.com
13.1.89.7 cn1-eth1 cn1-eth1.cluster.com

Configure adapters with static IPs¶

Execute confignetwork -s to configure both provision ip 11.1.89.7 and application data ip 13.1.89.7 as static
1. Add confignetwork -s into postscript list to execute on reboot
  chdef cn1 -p postscripts="confignetwork -s"
2. If the compute node is already running, use updatenode command to run confignetwork -s postscript without rebooting the node
  updatenode cn1 -P "confignetwork -s"
If install NIC is not configured in nics table, execute confignetwork without -s to only configure NICs defined in nics table
1. Add confignetwork into postscript list to execute on reboot
  chdef cn1 -p postscripts="confignetwork"
2. If the compute node is already running, use updatenode command to run confignetwork postscript without rebooting the node
  updatenode cn1 -P "confignetwork"

Note

Option -s writes the install NIC’s information into configuration file for persistence. All other NIC’s data defined in nics table will be written also. Without option -s, confignetwork only configures NIC’s data defined in nics table.

Check result¶

Use xdsh cn1 "ip addr" to check eth0 and eth1
Check ifcfg-eth0 and ifcfg-eth1 under /etc/sysconfig/network-scripts/