The deployment tool clustduct connects the genders database to the dnsmasq service. During initialization the files /etc/ethers and /etc/hosts are populated by node entries from the genders database. clustduct also monitors tftp file transfers and can so be used to deploy prebuilt images to compute nodes.
The central component of clustduct is the script
/usr/sbin/clustduct.lua
and is called directly by dnsmasq at every dhcp and tftp activity of dnsmasq.
Two scripts are used to create and maintain the directory and file structure for booting and installing the compute nodes. In order to copy the files from the syslinux package the shell script
/usr/sbin/prepare_tftp.sh
can be used. For the creation of the files used for grub or PXE the lua script
/usr/sbin/write_bf.lua
can be used. It can be used with following command line options
| option | description |
|---|---|
| -f | overwrite existing configuration files |
| -n NODE | create configuration only for given and not all nodes |
| -o DIRECTORY | base directory to write boot file to |
| -c DIRECTORY | search directory for configuration files |
The script
/usr/sbin/clustduc.lua
can be configured with the file
/etc/clustduct.conf
which is not parsed, but is itself a lua table. Following values can be used
| option | description |
|---|---|
| ethers | location of the ethers files, default is /etc/ethers |
| hosts | location of the hosts files, default is /etc/hosts |
| genders | location of the genders database, default is /etc/genders |
| domain | domain to which the nodes are expanded, must be the same as in /etc/dnsmasq.conf |
| linear_add | if true, nodes with unknown mac addresses will be added to the genders database |
| confdir | the directory where clustduct searches for template files, /etc/clustduct.d/ is used as default |
During the initializaton of clustduct or by calling write_bf.lua individual entries for every node are created. As templates for the menus shown at boot time, two files are used:
For the PXE boot, the file
/etc/clustduct.d/pxe_iptemplate
and for grub the file
/etc/clustduct.d/grub_iptemplate
is used. Following values are substituted
| value | description |
|---|---|
| $NODE | replaced with node name |
| $MAC | replaced with mac address |
| $IP | replaced with ip address |
The genders database is the single flat file located under /etc/genders. The format is
IDENTIFICATION KEY=VALUE
as IDENTIFICATION the name of the node or image is used. The node entry will be expanded to the FQDN. For the use of clustduct every node needs a single entry for every KEY and VALUE as the scripts may add and delete whole lines. An example database is shown below:
compute-01 ip=192.168.100.11
compute-02 ip=192.168.100.12
compute-03 ip=192.168.100.13
compute-03 mac=aa:bb:cc:dd:ee:ff
| value | description |
|---|---|
| ip | used a ip address, must be present for node entry |
| mac | used as for dhpd |
| install | image entry which be used as default boot for node, inferior to boot |
| boot | image entry for boot, takes precedence over install entry |
As genders does not allow white spaces and other special characters, so following translation table is used
| character | character description | value in genders |
|---|---|---|
| ' ' | whitespace | \ws |
| = | equals | \eq |
If an IDENTIFICATION in the genders database has KEY called 'menu' it is interpreted as a boot entry for grub called from (U)EFI and/or pxe network boot. Following values used for the boot entries are common for PXE and grub. All values which are not listed below will be ignored.
| value | description |
|---|---|
| menu | will be expanded the label of menu |
| kernel | kernel which be used to boot, could also be a chainloader |
| append | options appended to the kernel entry |
| mandatory | will be added to all node entries |
| nextboot | will be used as boot entry after trigger event |
| trigger | download if file name will be used as trigger event |
| value | description |
|---|---|
| com32 | used instead of kernel, used for chainloading |
| initrd | used as initrd in the append entry |
| value | description |
|---|---|
| initrdefi | used as initrdefi |
| set | used as set, like timeouts ... |
| chainloader | the used chainloader entries |
| grub | value is used without directly without 'grub' |
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