[SOLVED] Proxmox DNS Settings Reset every boot

[Nathan Davis]

This is similar to https://forum.proxmox.com/threads/proxmox-6-0-9-dns-host-settings-reset-every-time.59434/

Every time I reboot my server my dns settings are reset to 10.0.0.2. This is the IP of the Windows Server virtual machine running a DNS server. However, proxmox can't access this ip directly. It is behind a pfsense virtual machine at 10.0.0.1 as a firewall/router. I am not sure what I did to cause this, but I don't have any other network managers installed. The server has two ethernet ports enp5s0f0 and enp5s0f1. I assume I configured something wrong in
/etc/network/interfaces to cause this.


Proxmox 6.1-3
Kernal 5.3.10-1-pve

/etc/network/interfaces
auto lo
iface lo inet loopback

iface enp5s0f0 inet manual

iface enp5s0f1 inet manual

auto vmbr0
iface vmbr0 inet static
address 192.168.1.5
netmask 255.255.255.0
gateway 192.168.1.1
bridge-ports enp5s0f0
bridge-stp off
bridge-fd 0

auto vmbr1
iface vmbr1 inet manual
bridge-ports enp5s0f1
bridge-stp off
bridge-fd 0

auto vmbr2
iface vmbr2 inet manual
bridge-ports none
bridge-stp off
bridge-fd 0

 

[Stoiko Ivanov]

What's the content of '/etc/resolv.conf'

any indication in the journal where the settings get changed? (`journalctl -b` for the journal since the last boot)

 

[Nathan Davis]

somehow I installed NetworkManager,


/etc/resolv.conf
search lab.local
nameserver 1.1.1.1
# Generated by NetworkManager

I edited the network manager config to set dns=none based on this page

 

[Stoiko Ivanov]

Glad you found the issue!
please mark the thread as 'SOLVED' - it helps others, who have similar problems and are looking for a solution

Thanks!