Ansible Role: PowerDNS Authoritative Server

An Ansible role created by the folks behind PowerDNS to setup the PowerDNS Authoritative Server.

Requirements

An Ansible 2.2 or higher installation.

Dependencies

None.

Role Variables

Available variables are listed below, along with their default values (see defaults/main.yml):

pdns_install_repo: ""

By default, the PowerDNS Authoritative Server is installed from the software repositories configured on the target hosts.

# Install the PowerDNS Authoritative Server from the 'master' official repository
- hosts: all
  roles:
    - { role: PowerDNS.pdns,
        pdns_install_repo: "{{ pdns_auth_powerdns_repo_master }}"

# Install the PowerDNS Authoritative Server from the '4.1.x' official repository
- hosts: all
  roles:
    - { role: PowerDNS.pdns,
        pdns_install_repo: "{{ pdns_auth_powerdns_repo_41 }}"

# Install the PowerDNS Authoritative Server from the '4.2.x' official repository
- hosts: all
  roles:
    - { role: PowerDNS.pdns,
        pdns_install_repo: "{{ pdns_auth_powerdns_repo_42 }}"

The examples above, show how to install the PowerDNS Authoritative Server from the official PowerDNS repositories (see the complete list of pre-defined repos in vars/main.yml).

- hosts: all
  vars:
    pdns_install_repo:
      name: "powerdns" # the name of the repository
      apt_repo_origin: "example.com"  # used to pin the PowerDNS packages to the provided repository
      apt_repo: "deb http://example.com/{{ ansible_distribution | lower }} {{ ansible_distribution_release | lower }}/pdns main"
      gpg_key: "http://example.com/MYREPOGPGPUBKEY.asc" # repository public GPG key
      gpg_key_id: "MYREPOGPGPUBKEYID" # to avoid to reimport the key each time the role is executed
      yum_repo_baseurl: "http://example.com/centos/$basearch/$releasever/pdns"
      yum_debug_symbols_repo_baseurl: "http://example.com/centos/$basearch/$releasever/pdns/debug"
  roles:
    - { role: PowerDNS.pdns }

It is also possible to install the PowerDNS Authoritative Server from custom repositories as demonstrated in the example above.

 pdns_install_epel: True

By default, install EPEL to satisfy some PowerDNS Authoritative Server dependencies like protobuf. To skip the installtion of EPEL set pdns_install_epel to False.

pdns_package_name: "{{ default_pdns_package_name }}"

The name of the PowerDNS Authoritative Server package, pdns on RedHat-like systems and pdns-server on Debian-like systems.

pdns_package_version: ""

Optionally, allow to set a specific version of the PowerDNS Authoritative Server package to be installed.

pdns_install_debug_symbols_package: False

Install the PowerDNS Authoritative Server debug symbols.

pdns_debug_symbols_package_name: "{{ default_pdns_debug_symbols_package_name }}"

The name of the PowerDNS Authoritative Server debug package to be installed when pdns_install_debug_symbols_package is True, pdns-debuginfo on RedHat-like systems and pdns-server-dbg on Debian-like systems.

pdns_user: pdns
pdns_group: pdns

The user and group the PowerDNS Authoritative Server process will run as.
NOTE: This role does not create the user or group as we assume that they've been created by the package or other roles.

pdns_service_name: "pdns"

Name of the PowerDNS service.

pdns_service_state: "started"
pdns_service_enabled: "yes"

Allow to specify the desired state of the PowerDNS Authoritative Server service.

pdns_disable_handlers: False

Disable automated service restart on configuration changes.

pdns_config_dir: "{{ default_pdns_config_dir }}"
pdns_config_file: "pdns.conf"

PowerDNS Authoritative Server configuration file and directory.

pdns_config: {}

Dictionary containing the PowerDNS Authoritative Server configuration.
NOTE: The PowerDNS backends configuration and the config-dir, setuid and setgid directives must be configured through the pdns_user, pdns_group and pdns_backends role variables (see templates/pdns.conf.j2). For example:

pdns_config:
  master: yes
  slave: no
  local-address: '192.0.2.53'
  local-ipv6: '2001:DB8:1::53'
  local-port: '5300'

configures PowerDNS Authoritative Server to listen incoming DNS requests on port 5300.

pdns_service_overrides: {}

Dict with overrides for the service (systemd only). This can be used to change any systemd settings in the [Service] category.

pdns_backends:
  bind:
    config: '/dev/null'

Dictionary declaring all the backends you'd like to enable. You can use multiple backends of the same kind by using the {backend}:{instance_name} syntax. For example:

pdns_backends:
  'gmysql:one':
    'user': root
    'host': 127.0.0.1
    'password': root
    'dbname': pdns
  'gmysql:two':
    'user': pdns_user
    'host': 192.0.2.15
    'password': my_password
    'dbname': dns
  'bind':
    'config': '/etc/named/named.conf'
    'hybrid':  yes
    'dnssec-db': '{{ pdns_config_dir }}/dnssec.db'

By default this role starts just the bind-backend with an empty config file.

pdns_mysql_databases_credentials: {}

Administrative credentials for the MySQL backend used to create the PowerDNS Authoritative Server databases and users. For example:

pdns_mysql_databases_credentials:
  'gmysql:one':
    'priv_user': root
    'priv_password': my_first_password
    'priv_host':
      - "localhost"
      - "%"
  'gmysql:two':
    'priv_user': someprivuser
    'priv_password': my_second_password
    'priv_host':
      - "localhost"

Notice that this must only containes the credentials for the gmysql backends provided in pdns_backends.

pdns_sqlite_databases_locations: []

Locations of the SQLite3 databases that have to be created if using the gsqlite3 backend.

Example Playbooks

Run as a master using the bind backend (when you already have a named.conf file):

- hosts: ns1.example.net
  roles:
    - { role: PowerDNS.pdns }
  vars:
    pdns_config:
      master: true
      local-address: '192.0.2.53'
    pdns_backends:
      bind:
        config: '/etc/named/named.conf'

Install the latest '41' build of PowerDNS Authoritative Server enabling the MySQL backend. Provides also the MySQL administrative credentials to automatically create and initialize the PowerDNS Authoritative Server user and database:

- hosts: ns2.example.net
  roles:
    - { role: PowerDNS.pdns }
  vars:
    pdns_config:
      master: true
      slave: false
      local-address: '192.0.2.77'
    pdns_backends:
      gmysql:
        host: 192.0.2.120
        port: 3306
        user: powerdns
        password: P0w3rDn5
        dbname: pdns
    pdns_mysql_databases_credentials:
      gmysql:
        priv_user: root
        priv_password: myrootpass
        priv_host:
          - "%"
    pdns_install_repo: "{{ pdns_auth_powerdns_repo_41 }}"

NOTE: In this case the role will use the credentials provided in pdns_mysql_databases_credentials to automatically create and initialize the user (user, password) and database (dbname) connecting to the MySQL server (host, port).

Configure PowerDNS Authoritative Server in 'master' mode reading zones from two different PostgreSQL databases:

- hosts: ns2.example.net
  roles:
    - { role: PowerDNS.pdns }
  vars:
    pdns_config:
      master: true
      local-port: 5300
      local-address: '192.0.2.111'
    pdns_backends:
      'gpgsql:serverone':
        host: 192.0.2.124
        user: powerdns
        password: P0w3rDn5
        dbname: pdns2
      'gpgsql:otherserver':
        host: 192.0.2.125
        user: root
        password: root
        dbname: dns

Configure PowerDNS Authoritative Server to run with the gsqlite3 backend. The SQLite database will be created and initialized by the role in the location specified by the database_name variable.

- hosts: ns4.example.net
  roles:
    - { role: PowerDNS.pdns }
  vars:
    database_name: '/var/lib/powerdns/db.sqlite'
    pdns_config:
      master: true
      slave: false
      local-address: '192.0.2.73'
    pdns_backends:
      gsqlite3:
        database: "{{ database_name }}"
        dnssec: yes
    pdns_sqlite_databases_locations:
      - "{{ database_name }}"

Changelog

A detailed changelog of all the changes applied to the role is available here.

Testing

Tests are performed by Molecule.

$ pip install tox

To test all the scenarios run

$ tox

To run a custom molecule command

$ tox -e py27-ansible27 -- molecule test -s pdns-42

License

MIT