DNS failure

[vansens]

Hello, since a few days, my backups are failing and I am getting "Email not configured properly".
Turns out that name resolution does not work at all.

I tried to troubleshot unbound as per the Cloudron docs, but that won't work, as I discovered the /etc/netplan folder is completely empty.

I am running on a small VPS on vpshostingservice.co, Ubuntu 22.04. Cloudron 7.7.2 - I cannot upgrade because this is happening

Kindly assist.

[joseph]

@vansens does your provider use netplan? If not, you can simply setup /etc/resolv.conf to your preferred DNS (ideally, this should be your VPS's DNS provider if it has one).

[joseph]

@vansens if possible, create a test VPS on the service provider and check what they set up the default DNS to. alternately, ask their support . The quick fix while you are figuring this is simply use nameserver 1.1.1.1 in your /etc/resolv.conf

[vansens]

Hey thanks for the quick reply. I am looking at another VM at the same provider, and there is nothing in /etc/netplan either.

In the working machine's resolv.conf I see this:

nameserver 8.8.8.8
nameserver 1.1.1.1

In my Cloudron's resolv.conf, I see this:

nameserver 127.0.0.53
options edns0 trust-ad
search .

Do I overwrite it with your suggestion ("simply use nameserver 1.1.1.1") or do I append it?

[joseph]

@vansens You have already upgraded to 8.0.3 correct ? if so, just replace the file and that's it.

[vansens]

@joseph sorry I thought i updated but I did not. So i am still on 7.7.2 (but I cannot change the subject). I just tried to update with the /etc/resolv.conf set to what you suggested, but it failed and is still on 7.7.2

[joseph]

@vansens OK, so in 7.7.2, unbound is still in use. And the 127.0.0.53 in resolv.conf is correct . Can you check if

• unbound is running? Services -> unbound -> restart . Make sure it's green
• In /etc/resolv.conf, you should have nameserver 127.0.0.1 .
• then, try resolving using host www.cloudron.io 127.0.0.1 (via ssh) . does this work?

If the above two work, then the appstore pages should also load.

[vansens]

Hi @joseph, after restarting Unbound, my resolve.conf looks like this:

nameserver 127.0.0.53
options edns0 trust-ad
search .

Name resolution and the appstore work if I change the IP to 127.0.0.1, but not if I leave it at 127.0.0.53
With that temporary manual fix, I was able to upgrade to 8.0.3. Name resolution is not working. However, unbound is working now.

If I reboot with 8.0.3, the /etc/resolv.conf reads 127.0.0.53 again.

My apps are not working now, because they need to download some icons:

An error occurred during the configure operation: Network Error: Network error downloading icon : getaddrinfo EAI_AGAIN api.cloudron.io

How do I fix this please?

[joseph]

@vansens 127.0.0.53 is correct in Cloudron 8. I think the issue might be that systemd-resolved has no DNS servers to work with. The nameservers usually come via dhcp or static configuration in /etc/netplan/50-cloud-init.yaml . In that, you can add a static DNS like this (important: merge the setting below with the existing netplan). Then, after a reboot it should work.

    ethernets:
        eth0:
            nameservers:
                addresses:
                - 8.8.8.8
                - 1.1.1.1

Above, we are using Cloudflare and Google DNS. Ideally, you should use your server provider's DNS (if they provide one)

[vansens]

@joseph there is nothing in /etc/netplan on my host.
I am on a fixed IP set up with /etc/network/interfaces

[joseph]

@vansens so maybe you can then configure the DNS in /etc/systemd/resolved.conf . Set the DNS there .

[vansens]

@joseph Thanks, that was it! It's all working now.