Update pihole docker dns issue

Help docker
1

Hello,
I am running pi-hole in a docker using docker-compose. Everything is working well in general.

However, when I try to update the docker container I run into an issue. I stop the pi-hole and do a "docker compose pull". However, since pi-hole is down it can not reach the docker repository...

$ sudo docker compose pull
[+] Pulling 1/1
✘ pihole Error Get "https://registry-1.docker.io/v2/": dial tcp: lookup registry-1.docker.io on [::1]:53: read udp [::1]:42710->[::1]:53: read: connection refused 0.0s
Error response from daemon: Get "https://registry-1.docker.io/v2/": dial tcp: lookup registry-1.docker.io on [::1]:53: read udp [::1]:42710->[::1]:53: read: connection refused

When I perform the same command with pi-hole running it does pull, but this is not the way to go I understand.
sudo docker compose pull
[+] Pulling 1/1
:check_mark: pihole Pulled

What to do here?

2

Set a different DNS server in your docker compose file, like:

pihole:
    container_name: pihole
    image: pihole/pihole:latest
    dns:
      - 8.8.8.8
      - 8.8.4.4
    environment:
      TZ: 'Europe/London'
3

I just did that, but that doesn't help. I disable pi-hole docker first (sudo docker compose down), before trying to pull the updated image. The docker compose file is not relevant then, since the docker is down...

4

Your host is probably using Pi-hole, when the container is down it will not be able to resolve DNS. Please post your dns configuration by sharing the output of cat /etc/resolv.conf (on the host).

5

That's it, thank you! my resolv.conf was empty. After adding nameserver 8.8.4.4 to it, it immediately worked!

Thanks again