forked from critical/dns-zones
73 lines
2.1 KiB
Markdown
73 lines
2.1 KiB
Markdown
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# CAcert DNS zones
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CAcert runs its own public DNS nameservers on ns1 and ns2 in its BIT datacenter
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rack in Ede.
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We use [PowerDNS](https://doc.powerdns.com/authoritative/index.html) installed
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on Debian systems.
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This repository contains a Python script `update-zones.py` that is used for
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updating DNS information from this Git repository.
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The canonical URL for this repository is
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[https://code.cacert.org/critical/dns-zones.git](https://code.cacert.org/critical/dns-zones.git).
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## Prerequisites
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The server certificate for https://code.cacert.org/ needs to be trusted.
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Therefore the CAcert root CA certificate needs to be put into
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`/usr/local/share/ca-certificates` and hast to be registered as trusted by
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running
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```shell
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update-ca-certificates
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```
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The `update-zones.py` script needs `git`, `pdnsutil` and `python3`. We only use
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the Python 3 standard library and no external dependencies. The script uses
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`/usr/lib/sendmail` to send change mails. Mail sending has been tested with
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ssmtp and exim4.
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To make sure that all these prerequisites are met, you may run
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```shell
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apt install python3 ca-certificates pdns-server git mail-transport-agent
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```
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## Cloning the repository
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The git configuration on ns1 and ns2 has been adapted to allow remembering the
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credentials to clone the repository. A separate user pdnssync has been setup to
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allow cloning the repository.
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This repository is meant to be cloned on the CAcert DNS servers ns1 and ns2.
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```shell
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cd ~
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git config --global credential.helper store
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git config --global pull.ff only
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git clone https://code.cacert.org/critical/dns-zones.git
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```
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Credentials will only be asked for the initial clone. The credential helper
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records them in in `~/.git-credentials`.
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## Updating zones
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The user running the update needs read access to the configuration in
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`/etc/powerdns` (either member of the pdns group or root).
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```
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$ cd ~/dns-zones
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$ git pull
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$ ./update-zones.py
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```
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The `update-zones.py` tracks the local status in a branch (default
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'provisioned') that is updated when
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* a) zone changes have been applied
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* b) the running PowerDNS is responsible as secondary nameserver
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The `update-zones.py` script should be run on both nameservers.
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