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¶

Provision ip is coming from DHCP, there is no need to configure install nic into nics table. Provision ip can be configured in node definition, but it is not required.
```
chdef cn1 ip=11.1.89.7
```

Data NIC eth1 is not install NIC, configure eth1 into nics table

chdef cn1 nicips.eth1="13.1.89.7" nicnetworks.eth1="net13" nictypes.eth1="Ethernet" nichostnamesuffixes.eth1=-eth2

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, and only configure all other NIC’s data defined in nics table, execute confignetwork without -s
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"

Notes: 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 all 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/