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