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docs: document disabling ipv6 #119

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11 changes: 11 additions & 0 deletions README.md
Original file line number Diff line number Diff line change
Expand Up @@ -153,6 +153,17 @@ For example, [balenaOS](https://www.balena.io/os/) exposes its socket at
`/var/run/balena-engine.sock`. To accommodate this, merely set the `SOCKET_PATH`
environment variable to `/var/run/balena-engine.sock`.

## Disable IPv6

The default configuration should work with IPv4 and IPv6 out of the box.
Certain platforms have problems with this, causing the proxy to fail with an error message like the following:

```
Starting frontend dockerfrontend: cannot create listening socket [:::2375]
```

If you run into such problems, disable IPv6 by setting the environment variable `DISABLE_IPV6` to any affirmative value (`1`, `true`, or `yes`).

## Development

All the dependencies you need to develop this project (apart from Docker itself) are
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