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content/u/blog/how-to-enable-ipv6-in-docker/contents.lr

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+title: How to enable IPv6 in docker
+---
+pub_date: 2019-12-13
+---
+author: ungleich virtualisation team
+---
+twitter_handle: ungleich
+---
+_hidden: no
+---
+_discoverable: yes
+---
+abstract:
+The first step to enable docker containers with IPv6
+---
+body:
+
+If you are like us and like to do fun things with IPv6 and if you also
+like to run docker containers, then this article is for you.
+
+## Enabling IPv6 in docker
+
+Recent docker versions just need to have the **ipv6** flag and an IPv6
+network specfied in the **daemon.json**. This might look as follows:
+
+```
+{
+  "ipv6": true,
+  "fixed-cidr-v6": "your-ipv6-network-here"
+}
+```
+
+This configuration needs to be placed in **/etc/docker/daemon.json**.
+
+## Selecting the right IPv6 network
+
+In the IPv6 world we usually say, "just take a /64 for
+everything". And while we will never create 18446744073709551616
+containers on one host, we will just follow this dogma and use
+a /64 for docker.
+
+Why would we do this? One of the big advantages of IPv6 is that things
+get simpler. Instead of using a tiny network like a /120 that is
+suitable for 256 containers, we always choose a /64. This way we don't
+have to use our brain power on choosing the network size or to
+eventually later resize the network.
+
+If you have a /48 assigned to your host (like when you use the
+[IPv6VPN](https://IPv6VPN.ch)), you can basically use **any** of the
+65'536 networks that are available. We like to remember names so we
+usually take the **b00** network for containers (b00 as in the sound a
+ghost makes when flying around).
+
+So if your main /48 network was for instance 2a0a:e5c1:137::/48, we
+would use *2a0a:e5c1:137:b00::/64* and the daemon.json configuration file
+would look as follows:
+
+```
+{
+  "ipv6": true,
+  "fixed-cidr-v6": "2a0a:e5c1:137:b00::/64"
+}
+```
+
+After adding this configuration, you will also need to restart the
+docker daemon. After that, your containers should be using IPv6.
+
+## IPv6++
+
+If you want to learn more about IPv6 or how to secure your docker
+containers, stay tuned for the next blog posts, which will explain on
+how to secure access to your docker containers.
+
+In the mean time, you can also join the IPv6 discussion on
+[IPv6.Chat](https://IPv6.chat) or if you want to spawn your docker
+containers on a VM, you can do so on
+[IPv6OnlyHosting.com](https://IPv6OnlyHosting.com).