I'm trying to minimize the number of exposed ports for my Docker containers. Most of them, including Caddy, are using the `networks:` approach. However, for some services like Home Assistant, it's recommended to use `network_mode: host`. I need Caddy to act as a reverse proxy for Home Assistant, so I want to know how they can communicate. Here are my Docker Compose snippets:
caddy:
image: caddy
networks:
- caddy
ports:
- 80:80
- 443:443
homeassistant:
image: homeassistant
cap_add:
- NET_ADMIN
- NET_RAW
network_mode: host
Is this setup feasible given how Docker networking functions? What's the best approach to achieve this connection? Typically, Caddy communicates with other containers by their names.
4 Answers
Have you considered running Home Assistant as a VM or on bare metal instead of in a container? Many in the community find it to be more stable and reliable than the container version.
Here's how I set up my Home Assistant with Caddy as a reverse proxy, without using host networking. My containers work just fine together when they're all on the same network. Here’s an example of my Caddy config:
```
homeassistant:
image: homeassistant/home-assistant:stable
restart: unless-stopped
environment:
- TZ:${TZ}
volumes:
- $BASE_PATH/homeassistant:/config
networks:
- homeassistant-net
- caddy
```
I also have Zigbee2MQTT and Mosquitto running on the same network!
Understanding network namespaces in Docker is key here. When you use `network_mode: host`, the container shares the host's network directly. This setup complicates bridging to the Caddy network. However, Caddy can still proxy services running on the host or even external services. You will just need to tweak your Caddy configuration for it to work smoothly.
Just a heads up—by default, Docker containers use `network_mode: bridge`, which isolates them from the host network. This means that Home Assistant could struggle with discovering other LAN devices. To allow full LAN access, using host networking is beneficial, as it shares the network stack with the host.
Did you face any issues with devices not working due to this setup? I feel like not being in host mode might hamper features, like my router integration to check Wi-Fi connections. I got my Caddy config sorted using guidance from some community resources. Let me know if you need help!