HCL cluster/hcl node install configuration log

HCL Nodes will be installed from a clone of a root node, hcl07. The general installation of the root is documented here. There are a number of complications as a result of the cloning process. Solutions to these complications are also explained.

General Installation

Partition filesystem with swap at the end of the disk, size 1GB, equal to maximum of the installed memory on cluster nodes. Root file system occupies the remainder of the disk, EXT4 format.

Install long list of packages.

Configure network interface as follows:

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo eth1 eth0

iface lo inet loopback

# The primary network interface
allow-hotplug eth0
iface eth0 inet dhcp

allow-hotplug eth1
iface eth1 inet dhcp

Complications

Hostnames

Debian does not pull the hostname from the DHCP Server. Without intervention cloned nodes will keep the hostname of the root node. A bug describing this issue can be found here

The solution we will use is to add the file /etc/dhcp3/dhclient-exit-hooks.d/hostname with the contents:

if [[ -n $new_host_name ]]; then
  echo "$new_host_name" > /etc/hostname
  /bin/hostname $new_host_name
fi

The effect of this is to set the hostname of the machine after an interface is configured using dhclient (DHCP Client). ote, the hostname of the machine will be set to the last interface that is configured by dhcp, in the current configuration that will be eth0. If interfaces are reconfigured using dhclient, the hostnames will change.

Further, the current hostnames for the second interface on nodes eth1 are invalid. They follow the format hcl??_eth1.ucd.ie, however the '_' character is not permitted in hostnames and attempting to set such a hostname fails.