HPR3187: Ansible for Dynamic Host Configuration Protocol

Ansible DHCPD and DNS
Using Ansible to configure DHCPD and NDS on OpenBSD

Host data is stored in csv files
Ansible templates to create config files
Restart services

hostname-setup.yml
---
- hosts: localhost
tasks:
- name: read subnet 10
read_csv:
path: 10.csv
fieldnames: mac,ip,hostname
register: subnet_10
- name: read subnet 11
read_csv:
path: 11.csv
fieldnames: mac,ip,hostname
register: subnet_11
- name: read static
read_csv:
path: static.csv
fieldnames: hostname,ip
register: static_ip

- name: write dhcp file
template:
src: dhcpd.conf.j2
dest: /etc/dhcpd.conf
validate: dhcpd -nc %s
- name: write local.lan zone file
template:
src: local.lan.zone.j2
dest: /var/nsd/zones/master/local.lan
owner: root
group: _nsd
validate: nsd-checkzone local.lan %s
- name: nsd_conf
copy:
src: nsd.conf
dest: /var/nsd/etc/nsd.conf
owner: root
group: _nsd
validate: nsd-checkconf %s
- name: restart nsd
service:
name: nsd
state: restarted
- name: restart dhcpd
service:
name: dhcpd
state: restarted
- name: restart unbound
service:
name: unbound
state: restarted
10.csv
b8:27:eb:8b:7a:6d,192.168.10.100,pi3a
b8:27:eb:ef:f2:d4,192.168.10.101,pi3b
28:10:7b:25:d5:60,192.168.10.79,ipcam3
28:10:7b:0c:fa:7b,192.168.10.80,ipcam1
f0:7d:68:0b:ca:56,192.168.10.81,ipcam2
static.csv
tplink,192.168.10.2
gate,192.168.10.10
www,192.168.10.10
fox,192.168.10.17
dhcpd.conf.j2
option domain-name "local.lan";
option domain-name-servers 192.168.10.10;

subnet 192.168.10.0 netmask 255.255.255.0 {
option routers 192.168.10.10;
range 192.168.10.161 192.168.10.179;
{% for host in subnet_10.list %}
host static-client { hardware ethernet {{ host.mac }};fixed-address {{ host.ip }};} #{{ host.hostname }}
{% endfor %}
}

subnet 192.168.11.0 netmask 255.255.255.0 {
option routers 192.168.11.10;
range 192.168.11.72 192.168.11.127;
{% for host in subnet_11.list %}
host static-client { hardware ethernet {{ host.mac }};fixed-address {{ host.ip }};} #{{ host.hostname }}
{% endfor %}
}

Rendered DHCP entires
host static-client { hardware ethernet b8:27:eb:de:2f:38;fixed-address 192.168.10.45;} #pi3a
host static-client { hardware ethernet 28:10:7b:25:d5:60;fixed-address 192.168.10.79;} #ipcam3
host static-client { hardware ethernet 28:10:7b:0c:fa:7b;fixed-address 192.168.10.80;} #ipcam1

local.lan.zone.j2
$TTL 3600
local.lan. IN SOA a.root-servers.net. root. (
2016092901 ; Serial
3H ; refresh after 3 hours
1H ; retry after 1 hour
1W ; expire after 1 week
1D) ; minimum TTL of 1 day

IN NS gate.

IN MX 50 gate.local.lan.

local.lan. IN A 192.168.10.10

{% for host in static_ip.list%}
{{ host.hostname }} IN A {{ host.ip }}
{% endfor %}

{% for host in subnet_10.list%}
{{ host.hostname }} IN A {{ host.ip }}
{% endfor %}

{% for host in subnet_11.list%}
{{ host.hostname }} IN A {{ host.ip }}
{% endfor %}

Rendered A records
pi3b IN A 192.168.10.101
pi3a IN A 192.168.10.45
ipcam3 IN A 192.168.10.79
ipcam1 IN A 192.168.10.80
Run the playbook
ansible-playbook hostname-setup.yml