systemd and search domains.

[Dennis Straffin]

Newer Ubuntu systems use systemd-resolved which doesn't seem to support
split-horizon dns (at least last time I looked).

One solution is to go back to using dnsmasq.

* Install dnsmasq:

apt get install dnsmasq


* Update /etc/NetworkManager/NetworkManager.conf:

[main]

...

dns=dnsmasq


* Add a dnsmasq config file to /etc/NetworkManager/|dnsmasq.d/foo.conf
with your servers:|
|||server=/foo.bar/bar.baz/1.2.3.4

* Restart network manager:
|||

|||sudo service network-manager restart|||

||||||

||
* You might have to stop and disable the dnsmasq and resolved units:||

sudo systemctl stop systemd-resolved dnsmasq
sudo systemctl disable systemd-resolved dnsmasq

||
* You might also have to link /etc/resolv.conf to the network manager
generated one||:

sudo mv /etc/resolv.conf /etc/resolv.conf.orig
sudo ln -s /run/NetworkManager/resolv.conf /etc/resolv.conf

||
-Dennis
|

|
On 1/8/20 2:37 PM, Ken D'Ambrosio wrote:
> Hey, all.  When I fire up my VPN, it re-writes my /etc/resolv.conf.  
> Shocker.  But I *want* it to, because then all my DNS stuff is good for 
> my company.  But it's NOT good for my personal domain.  I'd like to have 
> that added to the search domains.  I'm in Ubuntu; not sure if that 
> matters.  From my reading:
> * I can the search domains on a per-interface manner, but that seems 
> hokey, and subject to issues if I use something (e.g., Bluetooth) to be 
> my conduit to the 'Net.
> * /etc/resolv.conf shouldn't be manually modified as it'll just get 
> overwritten (and I don't want to make it immutable because I want it to 
> change depending on whether I'm using VPN or no)
> * /etc/dhclient/dhclient.conf (apparently) doesn't matter any more if 
> you're running NetworkManager
>
> So, my question: is there an elegant, global way to set/append to my DNS 
> domain search list?  Or am I just gonna wind up writing a daemon to wham 
> an resolv.conf in-place depending on the current network config?
>
> Thanks,
>
> -Ken
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