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Local Registry

site/content/docs/user/local-registry.md

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Create A Cluster And Registry

The following shell script will create a local docker registry and a kind cluster with it enabled.

{{< codeFromFile file="static/examples/kind-with-registry.sh" >}}

Using The Registry

The registry can be used like this.

  1. First we'll pull an image docker pull gcr.io/google-samples/hello-app:1.0
  2. Then we'll tag the image to use the local registry docker tag gcr.io/google-samples/hello-app:1.0 localhost:5001/hello-app:1.0
  3. Then we'll push it to the registry docker push localhost:5001/hello-app:1.0
  4. And now we can use the image kubectl create deployment hello-server --image=localhost:5001/hello-app:1.0

If you build your own image and tag it like localhost:5001/image:foo and then use it in kubernetes as localhost:5001/image:foo.

If for some reason you have code running inside of a pod within the cluster that needs to use this registry directly (e.g. to build and push an image) then that code will need to use the kind-registry:5000 HTTP endpoint directly, as the code running inside your pod will not see the containerd config.

Pod manifests / pod specs / pod YAML should use localhost:5001, which will be rerouted to match the same name as the host via the containerd config.

<!--TODO: consider a shared guide for this which we can use across the docs-->

NOTE: A bit about "localhost" and containers ... "localhost" resolves to a loopback IP, which are network-namespace local. Network-namespace local means that the 127.0.0.1 / localhost / ::1 inside your container is NOT the same as the one on your host (unless using hostNetwork: true / --net=host).

KIND nodes are not --net=host and most pods are not, so really these "localhosts" are local to your pod container, to your kind node, and to your host machine in most cases.

However we can tell containerd that localhost:5001 should route to the registry container such that the same name works on both the host and your machine.

We do this so you can conveniently push and pull from a "local" address on your host and in your pod YAML.