BIND Configuration

The following configuration files in the master-nameserver SRPM should not be altered:

1. resolv.conf.master
   This tells the master itself which nameservers to look at. It refers first to the nameserver running on localhost and then to the UWM nameservers if this fails. You should not modify this file.
2. named.local
   This is an essential configuration file which should bot be modified. See the BIND howto for more information.
3. named.conf.master
   This configures BIND and tells it where to look for other configuration files. It should not be altered.

The three files that may be altered to add more machines are:

1. named.medusa
   This file contains the configuration for the medusa.phys.uwm.edu domain. It is is the most complicated of the three files and is described in detail below. There is a single file for the entire domain to resolve hostnames into IP addresses.
2. named.129.89.200
   This file provides reverse DNS lookup (IP address to hostname) for the lower medusa subnet (129.89.200.0). It is simple and is described below.
3. named.129.89.201
   This file provides reverse DNS lookup (IP address to hostname) for the upper medusa subnet (129.89.201.0). It is simple and described below.

Be aware of the following caveat:

named.medusa

The first part of the file is the configuration for the medusa domain and should not be changed.

@	IN	SOA	medusa.phys.uwm.edu. root.medusa.phys.uwm.edu. (
			200106241	; serial, todays date + todays serial #
			8H	; refresh, seconds
			2H	; retry, seconds
			1W	; expire, seconds
			1D )	; minimum, seconds
		NS	medusa.phys.uwm.edu.
		NS	hydra.phys.uwm.edu.
		NS	uwm.edu.
		MX	10 medusa-master001.medusa.phys.uwm.edu.
		TXT	"UWM LSC Group Medusa Beowulf"
localhost		A	127.0.0.1
medusa.phys.uwm.edu.		A	129.89.57.103
hydra.phys.uwm.edu.		A	129.89.57.104
ns		A	129.89.200.231
ns1		A	129.89.200.232
www		A	www.lsc-group.phys.uwm.edu.

The second part of the file is can be edited. It should contain an entry for each machine on the medusa subnet. This includes all the slaves, the masters, the switch, uwmlsc, dataserver, lj2200, etc.

The following short example shows the entries for two slaves, the printer and two masters.

medusa-slave001	A	129.89.200.11
	MX	10 medusa-master001.medusa.phys.uwm.edu.
	HINFO	"Intel-i686" "Linux 2.4.5"
slave001	CNAME	medusa-slave001
s001	CNAME	medusa-slave001
medusa-slave002	A	129.89.200.12
	MX	10 medusa-master001.medusa.phys.uwm.edu.
	HINFO	"Intel-i686" "Linux 2.4.5"
slave002	CNAME	medusa-slave002
s002	CNAME	medusa-slave002
medusa-master001	A	129.89.200.231
	MX	10 medusa-master001.medusa.phys.uwm.edu.
	HINFO	"Intel-i686" "Linux 2.4.5"
master001	CNAME	medusa-master001
m001	CNAME	medusa-master001
medusa-master002	A	129.89.200.232
	MX	10 medusa-master001.medusa.phys.uwm.edu.
	HINFO	"Intel-i686" "Linux 2.4.5"
master002	CNAME	medusa-master002
m002	CNAME	medusa-master002
lj2200	A	129.89.200.240
	MX	10 medusa-master001.medusa.phys.uwm.edu.
	HINFO	"Printer" "HP LaserJet 2200"

To add aonther node, simply create another entry in the file of the form above. For instace to add an entry for slave 241 add the lines:

medusa-slave241	A	129.89.201.11
	MX	10 medusa-master001.medusa.phys.uwm.edu.
	HINFO	"Intel-i686" "Linux 2.4.5"
slave241	CNAME	medusa-slave241
s241	CNAME	medusa-slave241

Although order within the second section of the file does not matter, you should keep the entries in ascending order of IP address.

named.129.89.200

The first part of the file is the configuration for the lower subnet reverse IP lookup and should not be changed.

@	IN	SOA	medusa.phys.uwm.edu. hostmaster.medusa.phys.uwm.edu. (
			200106241	; serial, todays date + todays serial #
			8H	; refresh, seconds
			2H	; retry, seconds
			1W	; expire, seconds
			1D )	; minimum, seconds
		NS	medusa.phys.uwm.edu.
		NS	hydra.phys.uwm.edu.
		NS	uwm.edu.

The second part of this file can be edited and contains the entries for reverse DNS lookup on the lower subnet. The following example fragment contains entries for two slaves.

11	PTR	medusa-slave001.medusa.phys.uwm.edu.
12	PTR	medusa-slave002.medusa.phys.uwm.edu.

Note the the reverse lookup should give the FQDN of the machine, i.e. medusa-slave001.medusa.phys.uwm.edu, not slave001 or s001. Note also that each FQDN ends in a period.

To add another machine, say to provide reverse DNS lookup for slave 50 add the following line to this file:

60

PTR

medusa-slave050.medusa.phys.uwm.edu.

Although order within the second section of the file does not matter, you should keep the entries in ascending order of IP address.

named.129.89.201

The first part of the file is the configuration for the upper subnet reverse IP lookup and should not be changed.

@	IN	SOA	medusa.phys.uwm.edu. hostmaster.medusa.phys.uwm.edu. (
			200106241	; serial, todays date + todays serial #
			8H	; refresh, seconds
			2H	; retry, seconds
			1W	; expire, seconds
			1D )	; minimum, seconds
		NS	medusa.phys.uwm.edu.
		NS	hydra.phys.uwm.edu.
		NS	uwm.edu.

The second part of this file can be edited and contains the entries for reverse DNS lookup on the upper subnet. The following example fragment contains entries for the printer and two masters.

231	PTR	medusa-master001.medusa.phys.uwm.edu.
232	PTR	medusa-master002.medusa.phys.uwm.edu.
240	PTR	lj2200.medusa.phys.uwm.edu.

Note the the reverse lookup should give the FQDN of the machine, i.e. medusa-master001.medusa.phys.uwm.edu, not master001 or m001. Note also that each FQDN ends in a period.

To add another machine, say to provide reverse DNS lookup for slave 241 add the following line to this file:

11

PTR

medusa-slave241.medusa.phys.uwm.edu.

Although order within the second section of the file does not matter, you should keep the entries in ascending order of IP address.