wiki-grav/pages/02.linux/powerdns/default.en.md

---
title: PowerDNS
visible: true
media_order: powerdns-admin-api-settings.png
---

[toc]

## Installation

For the autoriative server install this package  
`# apt install pdns-server`  
This is the PowerDNS resolver package  
`# apt install pdns-recursor`

### Different Backends can be installed on Debian

Mysql Backend  
`# apt install pdns-backend-mysql mariadb-server`

## Configuration Authoritative Server

Set the backend you chose in the `launch=` option of PowerDNS' configuration file.  
The config can be found under `/etc/powerdns/pdns.conf`

For MySQL I chose `launch=gmysql`

> A [list of backends can be found here](https://doc.powerdns.com/authoritative/backends/index.html)

Add the following parameters below `launch=gmysql`

```
gmysql-host=127.0.0.1
gmysql-socket=/run/mysqld/mysqld.sock
gmysql-user=(user)
gmysql-password=(password)
gmysql-dbname=pdns
# Add this for dnssec support
gmysql-dnssec=yes
```

Prepare database

```sh
mariadb -u root -p
```

```sql
CREATE DATABASE pdns;
GRANT ALL ON pdns.* TO 'pdns'@'localhost' IDENTIFIED BY '<password>';
```

Import the schema utilised by PowerDNS. This can be done with the user you just created

```sh
mysql -u pdns -p pdns < /usr/share/doc/pdns-backend-mysql/schema.mysql.sql
```

```sh
systemctl restart pdns
```

### Zones

Create Zone and add a name server  
`# pdnsutil create-zone (domain) ns1.(domain)`

Add "A"-Record. **Mind the (.) after the domain**  
"Name" is the hostname you wish to assign.  
`# pdnsutil add-record (domain). (name) A (ip address)`

### Dynamic DNS

`# apt install bind9utils`

Generate key  
`# dnssec-keygen -a hmac-md5 -b 128 -n USER (keyname)`

Edit the configuration file and change `dnsupdate=no` to `dnsupdate=yes` and set `allow-dnsupdate-from=` to empty.

Allow updates from your DHCP server  
`# pdnsutil set-meta (domain) ALLOW-DNSUPDATE-FROM (dhcp server ip)`  
If you set up a reverse-zone, also allow that  
`# pdnsutil set-meta (reverse ip).in-addr.arpa ALLOW-DNSUPDATE-FROM (dhcp server ip)`

Import the key  
`# pdnsutil import-tsig-key (keyname) hmac-md5 (key)`  
Enable for domain  
`# pdnsutil set-meta (domain) TSIG-ALLOW-DNSUPDATE (keyname)`  
And for reverse-zone  
`# pdnsutil set-meta (reverse ip).in-addr.arpa TSIG-ALLOW-DNSUPDATE (keyname)`

You also have to configure the DHCP server to provide updates, see [the DHCP article](https://wiki.realstickman.net/en/linux/services/dhcp-server)

#### Testing with nsupdate

`# nsupdate -k Kdhcpdupdate.+157+12673.key`

```
> server 127.0.0.1 5300
> zone testpdns
> update add test.testpdns 3600 A 192.168.7.10
> send
```

## Configuration Recursive Resolver

The config file can be found under `/etc/powerdns/recursor.conf`  
In `/etc/powerdns/pdns.conf` set `local-address=127.0.0.1` and `local-port=5300` to allow the recursor to run on port 53  
In `/etc/powerdns/recursor.conf` set `forward-zones=(domain)=127.0.0.1:5300` to forward queries for that domain to the authoritative DNS  
Also set `local-address` and `allow-from`  
To bind to all interfaces, use `local-address=::,0.0.0.0`

### Wipe Cache

`# rec_control wipe-cache $`

## DNSSEC

### Authoritative Server

> _TODO_

> https://doc.powerdns.com/authoritative/dnssec/index.html

### Recursor Server

To fully enable DNSSEC, set `dnssec=process-no-validate` to `dnssec=validate`

To allow a domain without DNSSEC, modify `/etc/powerdns/recursor.lua`  
Add `addNTA('(domain)')` to disable DNSSEC for the selected domain.

Show domains with disabled DNSSEC  
`# rec_control get-ntas`

> [DNSSEC Testing](https://wiki.debian.org/DNSSEC#Test_DNSSEC)

## WebGUI

### PowerDNS-Admin

```sh
mkdir /etc/pda-data
chmod 777 -R /etc/pda-data
```

```sh
podman run -d \
    --name powerdns-admin \
    -e SECRET_KEY='q5dNwUVzbdn6gc7of6DvO0syIhTHVq1t' \
    -v /etc/pda-data:/data \
    --net=host \
    docker://ngoduykhanh/powerdns-admin:latest
```

#### Enabling API

A few settings in `/etc/powerdns/pdns.conf` need to be changed.

```
api=yes
api-key=(random key)
webserver=yes
```

Following this, the API access can be configured in the webgui  
![Configuration options in PowerDNS Admin](powerdns-admin-api-settings.png)

Now you should see all your configured Domains and be able to modify records

#### Systemd Service

`/etc/systemd/system/powerdns-admin.service`

```systemd
[Unit]
Description=Powerdns Admin Podman container
[Service]
Restart=always
ExecStart=/usr/bin/podman start -a powerdns-admin
ExecStop=/usr/bin/podman stop -t 10 powerdns-admin
[Install]
WantedBy=multi-user.target
```

```sh
systemctl daemon-reload
systemctl enable --now powerdns-admin
```