Configure the Private and Public Networks¶
On the master node, execute
ip addr to view the available Ethernet
devices. These are typically named eth0 and eth1, although the names
may vary for your master node. The controller that is connected to the
private cluster network must have a static IP address and be able to
communicate with all the compute nodes, which themselves will be
assigned a dynamic IP address when booting. The controller that is
connected to the public cluster network can have a dynamic IP address or
a static IP address, although the latter is preferable for consistency
in accessing the master node from some other machine in the public
/etc/beowulf/config configuration file to specify the
private network interface details. Find the "interface" directive, and
change the initially undefined "none" name to the actual interface name,
and change the "iprange" directive to be the base address of the first
compute node, which is typically node n0. Then change the "nodes"
directive to specify the maximum number of compute nodes that are
connected to the private cluster network.
For example, suppose the interface name is "eth1", the master node's IP
address is 10.20.0.1, and there are currently eight compute nodes
connected, with a plan to add an additional eight later. The
file may then specify:
interface eth1 nodes 16 iprange 10.20.0.4
Note that the above "iprange" allows room for three additional master nodes, if desired, each with an unique IP address in the range 10.20.0.0 to 10.20.0.3. The 16 compute nodes span 10.20.0.4 to 10.20.0.19.