CentOS 7.x Rocks cluster 7.0 Compute node network configuration

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Add public network to compute node

We can see defined networks using:

rocks list network

Then we can see list of existing host interfaces using:

rocks list host interface <hostname>

We can see additional ports on host using:

ssh <hostname> "ip addr show" | grep mtu

Then we can configure IP address for the unconfigured interfaces in one of the listed networks (ie public) using:

rocks add host interface <hostname> iface=<interface-name> subnet=<network> ip=<ipaddress>

For example

rocks add host interface gpu iface=ens224 subnet=public ip=172.31.6.14

Then add route for Local networks via public (LAN) interface gateway using:

rocks add host route <hostname> <network> <gateway> netmask=<netmask>
rocks sync config
rocks sync host network <hostname>

For example

rocks add host route gpu 10.0.0.0 172.31.6.1 netmask=255.0.0.0
rocks sync config
rocks sync host network gpu

If required validate using:

ssh <hostname> "ip route show"

The above network and route changes persist across OS reinstalls. Hence if we reinstall the compute node using CentOS 7.x Rocks cluster 7.0 Build compute server#Reinstall_OS_on_compute_node it still has these settings

Refer:

• http://central-7-0-x86-64.rocksclusters.org/roll-documentation/base/7.0/x1316.html
• http://central-7-0-x86-64.rocksclusters.org/roll-documentation/base/7.0/x1326.html
• http://central-7-0-x86-64.rocksclusters.org/roll-documentation/base/7.0/customization-extra-nic.html

Swap network interfaces on compute node

In case the network settings need to be swapped between eth0,eth1 or between ens192,ens224, etc. then we can use the following:

rocks list host interface <hostname>
rocks swap host interface <hostname> ifaces=<iface1>,<iface2>
rocks list host interface <hostname>
rocks sync config
rocks sync host network <hostname>

Refer

• http://central-7-0-x86-64.rocksclusters.org/roll-documentation/base/7.0/x2156.html

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