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[help] systemd-resolved how to keep DNS server order? (lemmy.dbzer0.com)

submitted 2 months ago* (last edited 2 months ago) by clmbmb@lemmy.dbzer0.com to c/linux@lemmy.ml

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I have a pi hole in my network and I set it as my primary DNS server, and my router (a Mikrotik) as secondary. DHCP sets the DNS servers as pihole, mikrotik in this exact order and I want to keep it that way. I know systemd-resolved uses some algorithm to set the fastest dns as current server, but I don't want/need that. Is there some way to do configure it to just let it be?

I'm running Fedora 40.

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[–] nelsnelson@hexbear.net -3 points 2 months ago

Via ChatGPT 4 (accuracy unverified):

Yes, you can configure systemd-resolved to use the DNS servers in the order provided without dynamically switching based on speed. Here’s how you can do it:

Edit the resolved configuration file:

Open the resolved.conf file in a text editor:
```
sudo nano /etc/systemd/resolved.conf
```
Modify or add the following line:
```
DNS=`IP_of_pihole` `IP_of_mikrotik`
DNSStubListener=no
FallbackDNS=
```
Replace IP_of_pihole and IP_of_mikrotik with your actual DNS IP addresses. This tells systemd-resolved to only use the DNS servers in the order you've specified.
Prevent automatic DNS changes by network manager:

If you're using NetworkManager, create a drop-in configuration to prevent it from overriding DNS settings:
```
sudo mkdir -p /etc/NetworkManager/conf.d/
sudo nano /etc/NetworkManager/conf.d/dns.conf
```
Add the following content:
```
[main]
dns=none
```
Restart services:

After making these changes, restart systemd-resolved and NetworkManager:
```
sudo systemctl restart systemd-resolved
sudo systemctl restart NetworkManager
```

This should ensure that your system uses the DNS servers in the order provided without any automatic switching.