Pi-hole container not working after move of docker system storage folder

Hello everyone,

Hello ryecoaaron

Following a note in the documentation of the Docker Compose plugin for OMV7, I copied the Docker system folder from my system SSD (on which OMV runs) to my second SSD and would like to use it from there in the plugin.

To do this, I created the folder in the OMV7 WebGUI, gave my Docker user access rights and then copied all the data from /var/lib/docker into this new folder. Then I changed the Compose settings and reinstalled Docker Compose.

All containers are running except for my container for Pi-hole, which also has a MacVLAN. The container starts without errors but the Pi-hole WebGUI is no longer accessible under the assigned IP address.

If I change the Compose settings back to the old folder, the Pi-hole container also runs again.

Here is the Docker Compose of my Pi-hole container:

services:
  pihole:
    container_name: pihole
    hostname: cwwkmini-pc (docker)
    image: pihole/pihole:latest
    environment:
      TZ: 'Europe/Berlin'
      WEBPASSWORD: 'topSecret' # your Pi-hole password for web GUI
    volumes:
      - './etc-pihole:/etc/pihole'
      - './etc-dnsmasq.d:/etc/dnsmasq.d'
    restart: unless-stopped
    networks:
      macvlan_pihole:
        ipv4_address: 192.168.178.225 # target IPv4 for Pi-hole
        ipv6_address: 'fd00::4a5d:35ff:fe1e:225' # target IPv6 for Pi-hole

networks:
  macvlan_pihole:
    driver: macvlan
    enable_ipv6: true
    driver_opts:
      parent: br0 # my network bridge on OMV computer (standard: eth0)
    ipam:
      config:
#        - subnet: 192.168.178.224/30 # IPv4 subnet
#          gateway: 192.168.178.226 # my IPv4 network router
        - subnet: 192.168.178.0/24 # IPv4 subnet
          gateway: 192.168.178.1 # my IPv4 network router
        - subnet: 'fd00::/64' # IPv6 subnet
          gateway: 'fd00::1' # my IPv6 network router

What is the reason for this? How can I fix the error?

Many thanks and regards

Mic.

I don't knwo why but I deleted my copy of the files on the 2nd SSD now and copied them again to the 2nd SSD. Now it works. I used the following options:

rsync -rlptgoD --progress /var/lib/docker /srv/dev-disk-by-uuid-19461085-37d7-425f-89cb-7bbfc498f900/dockerSys

Thank you. 😊