54 lines
2.0 KiB
Markdown
54 lines
2.0 KiB
Markdown
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---
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title: Configure the aggregation layer
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reviewers:
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- lavalamp
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- cheftako
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- chenopis
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content_template: templates/task
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---
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{{% capture overview %}}
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Configuring the [aggregation layer](/docs/concepts/api-extension/apiserver-aggregation/) allows the Kubernetes apiserver to be extended with additional APIs, which are not part of the core Kubernetes APIs.
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{{% /capture %}}
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{{% capture prerequisites %}}
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{{< include "task-tutorial-prereqs.md" >}} {{< version-check >}}
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**Note:** There are a few setup requirements for getting the aggregation layer working in your environment to support mutual TLS auth between the proxy and extension apiservers. Kubernetes and the kube-apiserver have multiple CAs, so make sure that the proxy is signed by the aggregation layer CA and not by something else, like the master CA.
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{{% /capture %}}
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{{% capture steps %}}
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## Enable apiserver flags
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Enable the aggregation layer via the following kube-apiserver flags. They may have already been taken care of by your provider.
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--requestheader-client-ca-file=<path to aggregator CA cert>
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--requestheader-allowed-names=aggregator
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--requestheader-extra-headers-prefix=X-Remote-Extra-
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--requestheader-group-headers=X-Remote-Group
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--requestheader-username-headers=X-Remote-User
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--proxy-client-cert-file=<path to aggregator proxy cert>
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--proxy-client-key-file=<path to aggregator proxy key>
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If you are not running kube-proxy on a host running the API server, then you must make sure that the system is enabled with the following apiserver flag:
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--enable-aggregator-routing=true
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{{% /capture %}}
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{{% capture whatsnext %}}
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* [Setup an extension api-server](/docs/tasks/access-kubernetes-api/setup-extension-api-server/) to work with the aggregation layer.
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* For a high level overview, see [Extending the Kubernetes API with the aggregation layer](/docs/concepts/api-extension/apiserver-aggregation/).
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* Learn how to [Extend the Kubernetes API Using Custom Resource Definitions](/docs/tasks/access-kubernetes-api/extend-api-custom-resource-definitions/).
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{{% /capture %}}
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