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dns-server-setup

Ansible playbook to easily deploy new DNS servers. This playbook is used to deploy all AhaDNS DNS server nodes. This playbook also gives you the option to deploy a server that only answers to DNS queries over encrypted channels such as DNS-over-HTTPS and DNS-over-TLS.

Intended usecase

This ansible playbook deploys a fully configured AhaDNS server instance (except securing SSH config) featuring:

  • Blocking DNS server using oisd block list.
    • Block list automatically updated every 4 hours.
  • Unbound as recursive DNS server.
  • DNS over HTTPS (DoH) using NGINX and m13253's DoH server.
  • DNS over TLS (DoT) using NGINX.
  • Automatic SSL certificates for DoH & DoT by Let's Encrypt.
  • Locked-down firewall using IPTables.
  • Optimized sysctl config.
  • Automatic security updates enabled.
  • DNS request statistics API from AhaDNS/Aha.Dns.Statistics
    • GET endpoint will be available at https://{{ hostname }}/UnboundControlStats?api_key={{ ahaDnsStatisticsApiKey }}

All configuration that will be applied can be found in the files directory. The playbook is primarily created for AhaDNS but the public is of course welcome to use it as well.

Encrypted DNS only?

By editing the variable only_encrypted_dns in the hosts file you can select to deploy a fully configured DNS server that only allows encrypted DNS queries over DNS-over-TLS and DNS-over-HTTPS. Regular unencrypted queries over port 53 will be blocked. It's recommended to set this variable to true whenever possible.

Disclaimer

Please, do not set up public DNS servers if you don't know what you're doing. This Ansible playbook have been created during late evenings and I do not take any responsibility of the outcome of the playbook execution. Feel free to improve the notebook and submit your changes in a PR.

Prerequisites

  1. You must own a Fully Qualified Domain Name (FQDN) for:
    • Server hostname i.e. hostname.my.domain
    • DoH endpoint i.e. doh.hostname.my.domain
    • DoT endpoint i.e. dot.hostname.my.domain
  2. You must setup an A (and AAAA if IPv6 is desired) DNS zone for the three FQDN's mentioned above, pointing to the IP of the Linux server. Otherwise Let's Encrypt certificate creation will fail.

Install instructions

  1. Secure your SSH config to your preference on the host before running the playbook.
  2. Install Ansible on the machine that will run the playbook.
  3. Clone this repository using git clone https://github.com/AhaDNS/dns-server-setup.git
  4. Edit the hosts file to reflect your setup, i.e. change vars. playbook.yml does NOT need to be changed.
  5. Start playbook using ansible-playbook playbook.yml -i hosts --ask-become-pass -T 60
  • It is safe to re-execute the playbook multiple times.

Supported distros

  • Ubuntu 20.04 LTS
  • Debian 10 (untested)

Usage instructions

This is a high performance setup and does not provide any graphical user interface for configuration. After installation, you might want to:

  • Learn how the block/white-list are created and updated (see /etc/ahadns/unbound_update.sh)
  • Check your DNS request statistics by doing a GET query curl https://{{ hostname }}/UnboundControlStats?api_key={{ ahaDnsStatisticsApiKey }}
    • Change {{ hostname }} and {{ ahaDnsStatisticsApiKey }} with values used in the hosts file during setup
  • Tune the unbound config to your system (edit /etc/unbound/unbound.conf.d/ahadns.conf)
    • Should not be needed as it's automatically tuned during playbook execution

Support

We do not provide any official support for this playbook, but you can always reach out to us at:

And we'll try to hep you in best-effort.

Uninstall instructions

We do not provide any uninstall instructions yet. For now, we recommend you to reinstall your OS to completely remove everything.

Known issues

  • Playbook stuck on iptables restore v4 or iptables restore v6
    • Solution:
      • Stop the playbook execution (with ctrl + c), Then re-run the playbook.
  • Got error message Using a SSH password instead of a key is not possible because Host Key checking is enabled and sshpass does not support this. Please add this host's fingerprint to your known_hosts file to manage this host.
    • Solution:
      • On the machine running ansible, run export ANSIBLE_HOST_KEY_CHECKING=False

Acknowledgements

License

Unless otherwise specified, all code in this repository is released under the GNU General Public License v3.0. See the repository's LICENSE file for details.