dns request failed: request timed out about aardvark-dns HOT 22 OPEN

Ah, after turning /etc/resolv.conf again into a symlink of systemd-resolved
sudo ln -rsf /run/systemd/resolve/stub-resolv.conf /etc/resolv.conf
the messages disappear.
I assume it wants now to call the localhost ip of the systemd-resolved instead of the network ip of the outside resolver.

I don't know how I could let this plugin verbose debug logging into the journal, but I'm glad that it is fixed now.

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And it's back
dns request failed: request timed out

It seems to happen if I execute nslookup in a container.
But I get a result. Weird.

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I detected the same problem on my raspberry pi with Fedora and rootless podman containers.

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Having the exact same issue. DNS lookup is extremely unstable, only two thirds of lookups work.

This is on Fedora Silverblue 37 using rootless containers and the new networking stack.

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Now using a nextcloud container which communicates with a PostgreSQL and a LDAP container.
I access the nextcloud container with a nginx reverse proxy container from the internet.

1/3 of the nextcloud web interface results into a 502 bad gateway, because of the unstable DNS.
And my logs are getting spammed with

aardvark-dns[3617]: 50310 dns request failed: request timed out

I hope the next podman release will include the new network stack which hopefully fixes this issue.

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It is impossible to help with these issues as reporters did not provide versions for podman, netavark, and aarvark-dns. please provide as much relevant information as possible.

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podman: 4.3.1
netavark: 1.4.0
aardvark-dns: 1.4.0

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would you say your machine/vm is high performent or maybe has slow IO/processor/RAM limitations? I'm trying to understand if you might have a race.

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The first bare metal server server with this issue has the HDD connected to SATA with the server.
CPU: Intel Xeon E3-1231 v3 - 3.4 GHz - 4 core(s)
RAM: 32GB - DDR3

The second bare metal server has a 870 Evo SSD connected via SATA to the server.
CPU: AMD Phenom 2 955 X4 3.2 GHz 4 cores
RAM: 6GB - DDR2

The second server spams this issue many times.
The first server spams it less often but also regularly.

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@flouthoc wdyt?

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Now my faster server spammed it at night while the server pods weren't used by clients.

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We used to see similar issues in older versions of netavark and aardvark in Podman CI as well but it was fixed in newer versions with #220 but I guess there might be some issue which is not being reproduced in our CI, I'll try to reproduce this locally and see if i can reproduce this.

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I'm seeing the same problems on a freshly installed Fedora Server 37 instance as well. The machine is basically completely idling with no load and my journal is still filled with these errors. This issue was not present before 2022, and I've ran similar setups on slower machines without any DNS lookup issues.

podman: 4.3.1
netavark: 1.4.0
aardvark-dns: 1.4.0

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Can you test with v1.5?

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I think the timeout is fixed.
But now sometimes I get an "empty dns response" on all machines.

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Does this cause problems for the container or is just an error that is logged often?

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It's logged often with long breaks between. So it appears in groups most of the time.

I think the services just repeat the DNS action again until it works.
So I would say it just consumes CPU time and maybe network speed?

Maybe I don't use it long enough to see long term errors.

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Do you have a simple reproducer? What kind of application are you running and how many dns request does it make?

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Tested with v1.5 and I'm getting a lot of dns request got empty response as well. Here's a list of all the containers I'm running on my system:

• eclipse-mosquitto:2
• koenkk/zigbee2mqtt
• homeassistant/home-assistant:stable

It's notable that none of these containers are particularly demanding on the hardware, and my system load average is generally below 0.1 at all times.

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It happens without workload.

The server just runs

• mailrise
• swag & duckdns
• borg-backup-server

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I'm experiencing the same issue with aardvark-dns reporting lots of dns request got empty response errors in my logs. It seems to be causing problems for at least the containers running Uptime Kuma, Invidious and Jellyseerr. Uptime Kuma starts throwing ECONNRESET when doing GET requests, and Invidious and Jellyseerr similarly start to have their requests fail, with external content taking a long time to load, if at all.

It happens with both 1.5.0 and the latest 1.6.0 from podman-next. For me it seems to start after around 3 days of uptime. I've tried changing machines and switching from onboard Realtek to an Intel i350-T2 controller, but both to no avail. Rebooting solves the issue, until uptime reaches 3 days again.

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