Situation:
Running PiHole via Docker on Ubuntu 19.10, works well after setting up macvlan via docker-compose.yml. This is how I did it: https://github.com/zilexa/Mediaserver/blob/53ed1a13c7a1613a95ae927d0aa38803e57a38cb/pihole_docker-compose.yml
PiHole works fine, other devices in my LAN can access the /admin WebUI.
Problem:
The hostPC however cannot access the /admin WebUI. When you run PiHole on a RPi or Synology, you are not aware of this since you will only access the WebUI from another device (laptop, phone, PC).
Solution:
To make this work, another macvlan needs to be created, this time on the hostPC, not in docker:
ip link add mynet-shim link eno1 type macvlan mode bridge
ip addr add 192.168.88.10/24 dev mynet-shim
ip link set mynet-shim up
ip route add 192.168.88.5 dev mynet-shim
After running these commands, I can access /admin WebUI from the hostpc itself 
Problem:
How can I make these commands stick? Because after rebooting the hostPC, the macvlan I created with those commands is gone, I have to run those commands again!