edit ip6: enable ip6 in docker

_posts/misc/2023-09-16-ipv6_box.md

@@ -49,6 +49,41 @@ sudo systemctl restart networking
 
 Now our box is back to IPv6 only state.
 
-One downside with this system is that you can't implement auto update of docker images using watchtower. Since once again some of the docker registeries are inaccessible.
 
+> One downside with this system is that you can't implement auto update of docker images using watchtower. Since once again some of the docker registeries are inaccessible.
+
+One last concern is that you need to enable IPv6 networking in docker so that the containers can reach the outside world. This is explained in [Enable IPv6 support](https://docs.docker.com/config/daemon/ipv6/). Basically you have to edit the file `/etc/docker/daemon.json`.
+
+Once that's done you need to create a new IPv6 network and use that with your containers. Here's a sample compose file to run the qBittorrent image:
+
+```
+version: "3"
+services:
+  qbittorrent:
+    image: ghcr.io/hotio/qbittorrent
+    container_name: qbittorrent
+    networks:
+      - ip6net		# <---- add the container to the network
+    environment:
+      - PUID=1000
+      - PGID=1000
+      - TZ=Etc/UTC
+      - WEBUI_PORT=8080
+    volumes:
+      - /home/ajit/.config/appdata/qbtorrent:/config
+      - /home/ajit/downloads:/downloads
+    ports:
+      - 8080:8080
+      - 6881:6881
+      - 6881:6881/udp
+    restart: unless-stopped
+
+networks:
+  ip6net:
+    enable_ipv6: true
+    ipam:
+      config:
+        - subnet: 2001:0DB8::/112
+
+```