= pvl-hosts =
DNS/DHCP hosts management/integration for ISC bind9 and dhcpd.
Also includes network SNMP discovery.
== Hosts ==
The `pvl.hosts-* etc/hosts/test` tools read hosts files as input, which have an ini format, using section names as hostnames to configure attributes for that host:
[foo]
ip = 127.0.0.1
ethernet = 00:11:22:33:44:55
[bar]
ip = 127.0.0.2
ethernet = 01:23:45:67:89:ab
The default mechanism uses the basename of the given config file as the domain name, so this example file would generate something like the following output for use in a `zone "test" { ... }` zonefile:
$ pvl.hosts-dns --forward-zone=test etc/hosts/test
foo A 127.0.0.1
bar A 127.0.0.2
And correspondingly, the reverse zone for 127.0.0.0/8:
$ pvl.hosts-dns --reverse-zone=127 etc/hosts/test
1.0.0 PTR foo.test.
2.0.0 PTR bar.test.
And the associated DHCP hosts:
$ bin/pvl.hosts-dhcp etc/hosts/test
host foo {
option host-name foo;
hardware ethernet 00:11:22:33:44:55;
fixed-address 127.0.0.1;
}
host bar {
option host-name bar;
hardware ethernet 01:23:45:67:89:ab;
fixed-address 127.0.0.2;
}
=== Host aliases ===
Hosts can specify DNS aliases:
[foo]
ip = 127.0.0.1
alias = test1
[bar]
ip = 127.0.0.2
alias = test2
$ bin/pvl.hosts-forward --forward-zone alias.test etc/hosts/alias.test
foo A 127.0.0.1
test1 CNAME foo
bar A 127.0.0.2
test2 CNAME bar
=== Generated hosts ===
The hosts file format supports something similar to bind9's $GENERATE directive for hosts:
[asdf{1-3}]
ip = 10.100.100.$
$ bin/pvl.hosts-dns --forward-zone=asdf etc/hosts/asdf
asdf1@asdf A 10.100.100.1
asdf2@asdf A 10.100.100.2
asdf3@asdf A 10.100.100.3
Note that the generate directives are interpreted and compiled directly by pvl.hosts.
Most of the $GENERATE options should be supported, with a little clever hackery:
[asdf{1-5/2}{0,2}]
ip = 10.100.100.$${10}
$ bin/pvl.hosts-dns --forward-zone=asdf2 etc/hosts/asdf2
asdf01@asdf2 A 10.100.100.11
asdf03@asdf2 A 10.100.100.13
asdf05@asdf2 A 10.100.100.15
This feature can be used for generating reverse delegations:
[foo-{240-247}]
forward =
reverse = $.240/29.0.0.10.in-addr.arpa
ip = 10.0.0.$
$ bin/pvl.hosts-dns --reverse-zone=10 etc/hosts/reverse
240.0.0 CNAME 240.240/29.0.0.10.in-addr.arpa.
241.0.0 CNAME 241.240/29.0.0.10.in-addr.arpa.
242.0.0 CNAME 242.240/29.0.0.10.in-addr.arpa.
243.0.0 CNAME 243.240/29.0.0.10.in-addr.arpa.
244.0.0 CNAME 244.240/29.0.0.10.in-addr.arpa.
245.0.0 CNAME 245.240/29.0.0.10.in-addr.arpa.
246.0.0 CNAME 246.240/29.0.0.10.in-addr.arpa.
247.0.0 CNAME 247.240/29.0.0.10.in-addr.arpa.
=== DHCP Options ===
The hosts need not specify any fixed ip address, leaving IP address allocation to dhcpd:
[foo]
ethernet = 00:11:22:33:44:55
$ bin/pvl.hosts-dhcp etc/hosts/dhcp1
host foo {
option host-name foo;
hardware ethernet 00:11:22:33:44:55;
}
=== DHCP Boot options ===
The hosts can specify DHCP boot server/file options:
[foo]
ethernet = 00:11:22:33:44:55
boot = boot.lan:debian/wheezy/pxelinux.0
$ bin/pvl.hosts-dhcp etc/hosts/boot.dhcp
host foo {
option host-name foo;
hardware ethernet 00:11:22:33:44:55;
next-server boot.lan;
filename debian/wheezy/pxelinux.0;
}
=== DHCP hosts in multiple subnets/domains ===
A host with different interfaces in multiple domains must specify unique interface names:
[foo.dhcp]
[[asdf]]
ip = 10.1.0.1
ethernet.eth1 = 00:11:22:33:44:55
[bar.dhcp]
[[asdf]]
ip = 10.2.0.1
ethernet.eth2 = 55:44:33:22:11:00
$ bin/pvl.hosts-dhcp etc/hosts/dhcp2
host asdf-eth1 {
option host-name asdf;
hardware ethernet 00:11:22:33:44:55;
fixed-address 10.1.0.1;
}
host asdf-eth2 {
option host-name asdf;
hardware ethernet 55:44:33:22:11:00;
fixed-address 10.2.0.1;
}