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Add IPv6 only cluster docs #401

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25 changes: 25 additions & 0 deletions README.md
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Expand Up @@ -528,6 +528,31 @@ Now where next? I would recommend my detailed tutorial where I spend time lookin

Try it now: [Will it cluster? K3s on Raspbian](https://blog.alexellis.io/test-drive-k3s-on-raspberry-pi/)

## IPv6 only clusters

You will need to use a proxy to install k3s, because github.com doesn't have a IPv6 address and k3s binaries are hosted there.

[One easy solution](https://danwin1210.de/github-ipv6-proxy.php) to this problem is to add this to your /etc/hosts file:

```
2a01:4f8:c010:d56::2 github.com
2a01:4f8:c010:d56::3 api.github.com
2a01:4f8:c010:d56::4 codeload.github.com
2a01:4f8:c010:d56::5 objects.githubusercontent.com
```

Once you proxied your requests for github.com, make sure you bracket the ip, for example [2606:4700:4700::1111], and use `--host` `--server-host`, instead of `--ip` or `--server-ip`.

Example k3sup install on a IPv6 only cluster:
```sh
k3sup install --host [2606:4700:4700::1001] --user root --k3s-extra-args '--flannel-ipv6-masq'
```

Example k3sup join on a IPv6 only cluster:
```sh
k3sup join --host [2606:4700:4700::1111] --server-host [2606:4700:4700::1001] --user root
```

## Caveats on security

If you are using public cloud, then make sure you see the notes from the Rancher team on setting up a Firewall or Security Group.
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