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docs: guides moved to docs website

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Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>
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docs/guides/custom-registry-config.md
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# Using a custom registry configuration
If you [create a `docker-container` or `kubernetes` builder](https://docs.docker.com/engine/reference/commandline/buildx_create/) and
have specified certificates for registries in the [BuildKit daemon configuration](https://github.com/moby/buildkit/blob/master/docs/buildkitd.toml.md),
the files will be copied into the container under `/etc/buildkit/certs` and
configuration will be updated to reflect that.
Take the following `buildkitd.toml` configuration that will be used for
pushing an image to this registry using self-signed certificates:
```toml
# /etc/buildkitd.toml
debug = true
[registry."myregistry.com"]
ca=["/etc/certs/myregistry.pem"]
[[registry."myregistry.com".keypair]]
key="/etc/certs/myregistry_key.pem"
cert="/etc/certs/myregistry_cert.pem"
```
Here we have configured a self-signed certificate for `myregistry.com` registry.
Now [create a `docker-container` builder](https://docs.docker.com/engine/reference/commandline/buildx_create/)
that will use this BuildKit configuration:
```console
$ docker buildx create --use \
--name mybuilder \
--driver docker-container \
--config /etc/buildkitd.toml
```
Inspecting the builder container, you can see that buildkitd configuration
has changed:
```console
$ docker exec -it buildx_buildkit_mybuilder0 cat /etc/buildkit/buildkitd.toml
```
```toml
debug = true
[registry]
[registry."myregistry.com"]
ca = ["/etc/buildkit/certs/myregistry.com/myregistry.pem"]
[[registry."myregistry.com".keypair]]
cert = "/etc/buildkit/certs/myregistry.com/myregistry_cert.pem"
key = "/etc/buildkit/certs/myregistry.com/myregistry_key.pem"
```
And certificates copied inside the container:
```console
$ docker exec -it buildx_buildkit_mybuilder0 ls /etc/buildkit/certs/myregistry.com/
myregistry.pem myregistry_cert.pem myregistry_key.pem
```
Now you should be able to push to the registry with this builder:
```console
$ docker buildx build --push --tag myregistry.com/myimage:latest .
```
This page has moved to [Docker Docs website](https://docs.docker.com/build/buildkit/configure/#setting-registry-certificates)