You mean how to expose the local services on the machine via Tailscale? You can use the TS_DEST_IP env var. Let me show you my compose.yaml:

services:
  tailscale:
    image: tailscale/tailscale:v1.62.0
    container_name: tailscale
    cap_add:
      - NET_ADMIN
      - SYS_MODULE
    environment:
      - TS_HOSTNAME=tailnet-node-name
      - TS_AUTHKEY=tailnet-node-key
      - TS_STATE_DIR=/var/lib/tailscale # see below for persistence
      - TS_ACCEPT_DNS=true # to resolve tailnet names (not necessary if you use IPs)
      - TS_USERSPACE=false # to be able to raise tailscale0 interface
      - TS_DEST_IP=local-ip # the IP where you bind services you want to expose
      - TS_ROUTES=192.168.1.0/24 # optionally expose other local devices 
    volumes:
      - "./data/var/lib/tailscale:/var/lib/tailscale" # persist daemon preferences
      - "/dev/net/tun:/dev/net/tun" # to be able to raise tailscale0 interface
    deploy:
      resources:
	 limits:
	   memory: 256M
	   pids: 100
    restart: always

With TS_USERSPACE=false Tailscale will use kernel access to raise tailscale0 and allocate the tailnet IP you’ve specificed in Tailscale admin.

(TS_USERSPACE=true doesn’t use a network interface at all, you have to use a forward HTTP or SOCKS5 proxy. If you use =true and set up a proxy you don’t have to use TS_DEST_IP.)

With TS_DEST_IP you can bridge the tailnet IP to a local IP. By choosing that local IP well you can expose services to Tailscale selectively.

The simplest approach is to have docker services listen on 0.0.0.0 (happens by default if you don’t specify IP in the “ports:” section, and put the machine’s loopback or LAN IP in TS_DEST_IP. That way you’ll expose all the services automatically.

But you can also expose things explicitly. Let’s say the machine LAN IP is 192.168.1.1. You make up 10.100.100.100 on the host specifically for Tailscale exposure so you say TS_DEST_IP=10.100.100.100. Then in your “ports:” section in compose you add ports explicitly depending on what you want them exposed on. Let’s say you want Jellyfin exposed on both LAN and Tailscale, you add an entry for - 192.168.1.1:8096:8096/tcp and one for - 10.100.100.100:8096:8096/tcp. You only want CUPS exposed on the LAN not on Tailscale so you only add - 192.168.1.1:631:631/tcp for it. For Deluge you want to use the web interface on the LAN so you say - 192.168.1.1:8112:8112/tcp but you want RCP over Tailscale so you can use a phone admin app so you say - 10.100.100.100:58846:58846/tcp.

You get the idea. Yeah it’s a bit more work to specify everything explicitly but it’s a lot more precise (and you can still use the default and listen on 0.0.0.0 for when you want to expose everywhere).