Tailscale setup | (...) port 443: Name does not resolve => error in logs but everything works?

[gromoslaw-kroczka]

Steps to reproduce

1. Set up Nextcloud AIO with Tailscale subdomain
2. Everything seems to work fine
3. You've got below log every 5 sec in nextcloud-aio-nextcloud container:
   nc: getaddrinfo for host "nextcloud.<tailnet>.ts.net" port 443: Name does not resolve

Expected behavior

When everything works then it shouldn't be any error log message?

Actual behavior

There are log errors when everything seems to work well.

Host OS

Debian 12 on Proxmox VM

Nextcloud AIO version

Nextcloud AIO v7.5.1

Current channel

latest

Other valuable info

Tailscale container running alongside Nextcloud AIO

services:
  nextcloud:
    container_name: nextcloud-aio-mastercontainer
    image: nextcloud/all-in-one:latest
    restart: unless-stopped
    networks:
      - nextcloud-aio
    ports:
      - 8086:8080
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock:ro
      - nextcloud_aio_mastercontainer:/mnt/docker-aio-config
    environment:
      - APACHE_PORT=11000
      - APACHE_IP_BINDING=0.0.0.0
      - SKIP_DOMAIN_VALIDATION=true

  nextcloud-tailscale:
    container_name: nextcloud-tailscale
    image: tailscale/tailscale:latest
    restart: unless-stopped
    cap_add:
      - NET_ADMIN
      - NET_RAW
    network_mode: host
    hostname: nextcloud
    volumes:
      - /dev/net/tun:/dev/net/tun
      - /home/<user>/docker/nextcloud/tailscale/varlib:/var/lib
      - /home/<user>/docker/nextcloud/tailscale/tmp:/tmp
    environment:
      - TS_STATE_DIR=/var/lib/tailscale

networks:
  nextcloud-aio:
    name: nextcloud-aio

volumes:
  nextcloud_aio_mastercontainer:
    name: nextcloud_aio_mastercontainer

[szaimen]

Hi, apparently the container cannot resolve the tailscale domain. Unfortunatley I cannot help further as I dont have such a setup and also cannot reproduce it with a "normal" setup without talescale. So for help better refer to https://help.nextcloud.com

[gromoslaw-kroczka]

I've noticed few more details:

1. Along with errors in containers logs there are a lot of DNS request to my nextcloud domain (every 5 sec)
2. Restart of the whole container fixes the issue (both errors and DNS requests)
3. Both sypmtoms reoccur (begin) each night after Nextcloud Borg backup (internal Nextcloud)