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add private registry usage docs

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BenTheElder committed Mar 29, 2019
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title: "Private Registries"
parent: "user"
identifier: "user-private-registries"
weight: 3
# Private Registries

Some users may want to test applications on kind that require pulling images
from authenticated private registries, there are multiple ways to do this.

## Use ImagePullSecrets

Kubernetes supports configuring pods to use `imagePullSecrets` for pulling
images. If possible, this is the preferable and most portable route.

See [the upstream kubernetes docs for this][imagePullSecrets],
kind does not require any special handling to use this.

## Pull to the Host and Side-Load

kind can [load an image][loading an image] from the host with the `kind load ...`
commands. If you configure your host with credentials to pull the desired
image(s) and then load them to the nodes you can avoid needing to authenticate
on the nodes.

## Add Credentials to the Nodes

Generally the upstream docs for [using a private registry] apply, with kind
there are two options for this.

### Mount a Config File to Each Node

If you pre-create a docker config.json containing credential(s) on the host
you can mount it to each kind node.

Assuming your file is at `/path/to/my/secret.json`, the kind config would be:

kind: Cluster
- role: control-plane
- containerPath: /var/lib/kubelet/config.json
hostPath: /path/to/my/secret.json

### Add Credentials Programmatically

A credential can be programmatically added to the nodes at runtime.

If you do this then kubelet must be restarted on each node to pick up the new credentials.

An example bash snippet for doing this with with [][GCR]:

# login to GCR on all your kind nodes
# KUBECONFIG should point to your kind cluster
export KUBECONFIG="$(kind get kubeconfig-path --name="kind")"
# setup credentials on each node
for node in $(kubectl get nodes -oname); do
# the -oname format is kind/name (so node/name) we just want name
gcloud auth print-access-token | docker exec -i ${node_name} docker login -u oauth2accesstoken --password-stdin
# copy the config to where kubelet will look
docker exec ${node_name} cp /root/.docker/config.json /var/lib/kubelet/config.json
# restart kubelet to pick up the config
docker exec ${node_name} systemctl restart kubelet.service

[loading an image]: /docs/user/quick-start/#loading-an-image-into-your-cluster
[using a private registry]:
@@ -136,6 +136,8 @@ and / or:
See [Kubernetes imagePullPolicy][Kubernetes imagePullPolicy] for more information.

See also: [Using kind with Private Registries][Private Registries].

## Building Images

kind runs a local Kubernetes cluster by using Docker containers as "nodes".
@@ -271,3 +273,4 @@ kind, the Kubernetes cluster itself, etc.
[install docker]:
[Kubernetes imagePullPolicy]:
[Private Registries]: /docs/user/private-registries

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