DNS controller?

Hi,

What is supposed to control DNS on OpenMediaVault, please?

Is it systemd-resolved? Or is it something else?

Regards,

Joseph885412

OK. Thanks ryecoaaron.

Do you know why, when I set my DNS using OMV web interface OR omv-firstaid, that the DNS address specified isn't used? The one used is the one in /etc/resolv.conf. OMV web interface or omv-firstaid don't change the DNS server in /etc/resolv.conf.

Yes it's started:

But DNS queries uses the DNS server specified in : /etc/resolv.conf (which is 8.8.8.8 in my case) instead of the server I had configured with OMV web GUI (64.6.64.6)/etc/resolv.conf :

I'm not sure but it seems that there's no symlink for /etc/resolv.conf. Do you know how to check this exactly? I've tried this and it doesn't output the file we're looking for:

It seems it's not a symlink:

root@openmediavault:/etc# readlink -f resolv.conf

/etc/resolv.conf

root@openmediavault:/etc#

And it seems that /run/systemd/resolved/resolv.conf doesn't exist... :

root@openmediavault:/# cd /run/systemd/resolved/

-bash: cd: /run/systemd/resolved/: No such file or directory

root@openmediavault:/#

Do you have an idea of what's going on?

Yes it exists:

root@openmediavault:~# ls -al /run/systemd/resolve/resolv.conf

-rw-r--r-- 1 systemd-resolve systemd-resolve 637 Jun 18 12:59 /run/systemd/resolve/resolv.conf

Content of /run/systemd/resolve/resolv.conf:

nameserver 8.8.8.8

nameserver 1.1.1.1

nameserver 64.6.64.6

search local

Deleted /etc/resolv.conf and re-created it as a symlink:

root@openmediavault:/etc#sudo rm /etc/resolv.conf && sudo ln -s /run/systemd/resolve/resolv.conf /etc/

Now we can see that resolv.conf is a symlink within the /etc/ folder:

root@openmediavault:/etc# ls -la /etc/ | grep "\->"

lrwxrwxrwx 1 root root 35 Jun 16 19:51 localtime -> /usr/share/zoneinfo/America/Moncton

lrwxrwxrwx 1 root root 19 Jun 16 17:43 mtab -> ../proc/self/mounts

lrwxrwxrwx 1 root root 21 May 2 16:39 os-release -> ../usr/lib/os-release

lrwxrwxrwx 1 root root 32 Jun 18 13:14 resolv.conf -> /run/systemd/resolve/resolv.conf

lrwxrwxrwx 1 root root 13 Jun 16 17:27 rmt -> /usr/sbin/rmt

^{Checked content: It was empty...}

^{sudo nano /etc/resolv.conf}

Restarted systemd-resolved:

systemctl restart systemd-resolved

^{Checked content:}

^{sudo nano /etc/resolv.conf}

Now the content is:

nameserver 64.6.64.6

The name server I had set using omv-firstaid!!!

Did reboot OMV to make sure everything stays as it is.

Checked which DSN server was used using dig:

root@openmediavault:~# dig twitter.com

; <<>> DiG 9.11.5-P4-5.1+deb10u1-Debian <<>> twitter.com

;; global options: +cmd

;; Got answer:

;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 6226

;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:

; EDNS: version: 0, flags:; udp: 512

;; QUESTION SECTION:

;twitter.com. IN A

;; ANSWER SECTION:

twitter.com. 391 IN A 104.244.42.193

twitter.com. 391 IN A 104.244.42.129

;; Query time: 60 msec

;; SERVER: 64.6.64.6#53(64.6.64.6)

;; WHEN: Thu Jun 18 13:43:59 UTC 2020

;; MSG SIZE rcvd: 72

It's 64.6.64.6 . So it stayed the same.

Let's do another check:

root@openmediavault:~# resolvectl status

Global

LLMNR setting: yes

MulticastDNS setting: yes

DNSOverTLS setting: no

DNSSEC setting: allow-downgrade

DNSSEC supported: yes

DNSSEC NTA: 10.in-addr.arpa

16.172.in-addr.arpa

168.192.in-addr.arpa

.

.

.

Link 2 (ens33)

Current Scopes: DNS LLMNR/IPv4

DefaultRoute setting: yes

LLMNR setting: yes

MulticastDNS setting: no

DNSOverTLS setting: no

DNSSEC setting: allow-downgrade

DNSSEC supported: yes

Current DNS Server: 64.6.64.6

DNS Servers: 64.6.64.6

Now it seems that the Global DNS isn't used. It's the Link 2 DNS that is used.

Cool!

Thanks a lot ryecoaaron!! (I did send you a PM would you please check it?)