[Solved] DNS resolution fails twice a day at the same time - where should I look?

Mask the service or

sudo apt-get remove dnsmasq-base

Package 'dnsmasq-base' is not installed, so not removed

Ok, then just go for sudo apt-get remove dnsmasq

Package 'dnsmasq' is not installed, so not removed

How possible is this?

apt list lists all known packages.
apt list --installed lists only installed packages.

Please run sudo service dnsmasq status

Sorry, noob mistake.

apt list --installed dnsmasq

Listing... Done

sudo service dnsmasq status

Unit dnsmasq.service could not be found.

Ok, dnsmasq is not installed on your system, but your log says it is:

What log output is this? Could it be associated with your containerd?

I was having a hard time checking syslog, so this one is from Cockpit. IIRC I haven't installed containerd or something like that, but I'm checking right now...

It seems pihole debug knows about it :wink:

OMG :man_facepalming: now I remember.
I was trying to self-host Radicale, it didn't go very well and I thought I deleted everything. I'm deleting everything (container, image and even Docker) right away.

Update: everything Docker-related uninstalled/autoremoved/purged and system rebooted. I'll wait for the magic hour this evening and see if the DNS will go down again. Will update here.

Hi folks, just a quick update on this.

  1. Having to restart pihole-ftl made me think it was a Pihole issue, but it was apparently deeper in the system.

  2. Now that Ubuntu 20.04.1 LTS is out, I'll probably go ahead and reinstall from scratch (I'm currently on 18.04 LTS) , instead of simply upgrading.

Thanks.

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