content/posts/2024/reconcile-docker-with-deutsche-bahn/index.md

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----
-title: "Reconcile Docker With Deutsche Bahn"
-description: >
-  If WiFi does not work on Deutsche Bahn's ICE trains and you have Docker installed,
-  there may be network interference which can be fixed easily.
-date: 2024-09-26T09:07:30Z
-draft: false
-# ShowLastmod: true
-toc: false
-scrolltotop: true
-#featuredImg: reconcile-docker-with-deutsche-bahn.png
-tags:
-  - network
-  - Deutsche Bahn
-  - Docker
-  - travel
----
-
-![Composition of screenshots](reconcile-docker-with-deutsche-bahn.png)
-
-If you happen to be a (Linux) power user travelling on a Deutsche Bahn [ICE
-long-distance train][ice] and you wonder why you don't get a working network
-connection with the complimenatary "WIFIonICE" wireless network, there may be a
-network interference on your laptop.
-
-There are multiple solutions for this on the web. My favorite solution is to
-change Docker's network configuration by editing (or creating) the file
-`/etc/docker/daemons.json`. However, you may need to prune existing Docker
-networks first. Otherwise the Docker service will fail to start with the
-following message:
-
-```plain
-failed to start daemon: Error initializing network controller: error creating default "bridge" network: all predefined address pools have been fully subnetted
-```
-
-Therefore, I recommend the following steps (this is on a Fedora Linux system with *systemd*):
-
-1. Stop any docker containers that you may have running, including services managed by docker compose.
-2. Prune the networks:
-
-   ```bash
-   docker network prune
-   ```
-
-3. Create or edit `/etc/docker/daemon.json` so that it contains the following:
-
-   ```plain
-   {
-       "default-address-pools":
-       [
-           {"base":"172.19.0.0/16","size":24}
-       ]
-   }
-   ```
-
-4. Restart docker:
-
-   ```bash
-   systemctl restart docker
-   ```
-
-5. Connect to `WIFIonICE` and enjoy your network connection :-)
-
-## References
-
-- StackExchange answer that provides the solution as presented here -- see also
-  the answer about pruning the networks below.
-
-  <https://unix.stackexchange.com/a/539258/110635>
-
-- If you don't want to or cannot configure your Docker networks, you can also
-  turn Docker off and on again when you travel:
-
-  <https://kuttler.eu/code/ice-wlan-linux-docker/>
-
-  This is what I used to do myself, but nowadays I prefer to just configure the
-  Docker network differently.
-
-- There are many more internet sources (and I have just added another one...), I
-  won't copy all those links into my post, see DuckDuckGo search results
-  for yourself:
-
-  <https://duckduckgo.com/?q=docker+wifi+on+ice>
-
-[ice]: https://int.bahn.de/en/trains/long-distance-trains

themes/hermit-v2

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-Subproject commit 50d838e649b4c5d624d5e47299bbcf10731fc132
+Subproject commit 1ff47e11f0d79b537cf58e0ee6ed3bf04a96b12f