Exactly — keep **one** central Caddy **outside** Docker (systemd) and proxy to **whatever** runs inside containers, VMs, or localhost.  
That’s the **single source of truth** you want.

--------------------------------------------------
1. Central Caddyfile (systemd) – **one file** rules them all
----------------------------------------------------
```bash
sudo nano /etc/caddy/Caddyfile
```
Content (add more blocks as you spin up services):
```
# Git service inside Docker
git.crazystorm-andromeda.duckdns.org {
    reverse_proxy localhost:3000   # Docker published port
    encode gzip
    header -Server
}

# Future service – just add another block
# next.crazystorm-andromeda.duckdns.org {
#     reverse_proxy localhost:4000
# }
```

--------------------------------------------------
2. Reload after any edit
----------------------------------------------------
```bash
sudo systemctl reload caddy
```

--------------------------------------------------
3. Benefits you keep
----------------------------------------------------
- **One** Let’s Encrypt account, **one** cert cache, **one** log stream  
- **No** extra Caddy container to babysit  
- **Any** backend (Docker, native, remote IP) just becomes another `reverse_proxy` line  
- **Survives** Docker Compose restarts; systemd starts before Docker

--------------------------------------------------
4. House-keeping
----------------------------------------------------
```bash
# validate syntax
caddy validate --config /etc/caddy/Caddyfile

# live reload
sudo systemctl reload caddy
```

That’s the **central, primitive, single-file** setup — add a block, reload, done.