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kubeadm alpha 90

{{< caution >}} kubeadm alpha provides a preview of a set of features made available for gathering feedback from the community. Please try it out and give us feedback! {{< /caution >}}

In v1.8.0, kubeadm introduced the kubeadm alpha phase command with the aim of making kubeadm more modular. This modularity enables you to invoke atomic sub-steps of the bootstrap process; you can let kubeadm do some parts and fill in yourself where you need customizations.

kubeadm alpha phase is consistent with kubeadm init workflow, and behind the scene both use the same code.

kubeadm alpha phase preflight

You can execute preflight checks both for the master node, like in kubeadm init, or for the worker node like in kubeadm join.

{{< tabs name="tab-preflight" >}} {{< tab name="master" include="generated/kubeadm_alpha_phase_preflight_master.md" />}} {{< tab name="node" include="generated/kubeadm_alpha_phase_preflight_node.md" />}} {{< /tabs >}}

kubeadm alpha phase certs

You can create all required certificates with the all subcommand or selectively create certificates.

{{< tabs name="tab-certs" >}} {{< tab name="all" include="generated/kubeadm_alpha_phase_certs_all.md" />}} {{< tab name="ca" include="generated/kubeadm_alpha_phase_certs_ca.md" />}} {{< tab name="apiserver" include="generated/kubeadm_alpha_phase_certs_apiserver.md" />}} {{< tab name="apiserver-kubelet-client" include="generated/kubeadm_alpha_phase_certs_apiserver-kubelet-client.md" />}} {{< tab name="sa" include="generated/kubeadm_alpha_phase_certs_sa.md" />}} {{< tab name="front-proxy-ca" include="generated/kubeadm_alpha_phase_certs_front-proxy-ca.md" />}} {{< tab name="front-proxy-client" include="generated/kubeadm_alpha_phase_certs_front-proxy-client.md" />}} {{< /tabs >}}

kubeadm alpha phase kubeconfig

You can create all required kubeconfig files with the all subcommand, or selectively create the files. Additionally, the user subcommand supports the creation of kubeconfig files for additional users.

{{< tabs name="tab-kubeconfig" >}} {{< tab name="all" include="generated/kubeadm_alpha_phase_kubeconfig_all.md" />}} {{< tab name="admin" include="generated/kubeadm_alpha_phase_kubeconfig_admin.md" />}} {{< tab name="kubelet" include="generated/kubeadm_alpha_phase_kubeconfig_kubelet.md" />}} {{< tab name="controller-manager" include="generated/kubeadm_alpha_phase_kubeconfig_controller-manager.md" />}} {{< tab name="scheduler" include="generated/kubeadm_alpha_phase_kubeconfig_scheduler.md" />}} {{< tab name="user" include="generated/kubeadm_alpha_phase_kubeconfig_user.md" />}} {{< /tabs >}}

kubeadm alpha phase controlplane

You can create all required static Pod files for the control plane components with the all subcommand, or selectively create the files.

{{< tabs name="tab-controlplane" >}} {{< tab name="all" include="generated/kubeadm_alpha_phase_controlplane_all.md" />}} {{< tab name="apiserver" include="generated/kubeadm_alpha_phase_controlplane_apiserver.md" />}} {{< tab name="controller-manager" include="generated/kubeadm_alpha_phase_controlplane_controller-manager.md" />}} {{< tab name="scheduler" include="generated/kubeadm_alpha_phase_controlplane_scheduler.md" />}} {{< /tabs >}}

kubeadm alpha phase etcd

Use the following command to create a self-hosted, local etcd instance based on a static Pod file.

{{< tabs name="tab-etcd" >}} {{< tab name="etcd local" include="generated/kubeadm_alpha_phase_etcd_local.md" />}} {{< /tabs >}}

kubeadm alpha phase mark-master

Use the following command to label and taint the node with the node-role.kubernetes.io/master="" key-value pair.

{{< tabs name="tab-mark-master" >}} {{< tab name="mark-master" include="generated/kubeadm_alpha_phase_mark-master.md" />}} {{< /tabs >}}

kubeadm alpha phase bootstrap-token

Use the following actions to fully configure bootstrap tokens. You can fully configure bootstrap tokens with the all subcommand, or selectively configure single elements.

{{< tabs name="tab-bootstrap-token" >}} {{< tab name="all" include="generated/kubeadm_alpha_phase_bootstrap-token_all.md" />}} {{< tab name="create" include="generated/kubeadm_alpha_phase_bootstrap-token_create.md" />}} {{< tab name="cluster-info" include="generated/kubeadm_alpha_phase_bootstrap-token_cluster-info.md " />}} {{< tab name="node allow-auto-approve" include="generated/kubeadm_alpha_phase_bootstrap-token_node_allow-auto-approve.md" />}} {{< tab name="node allow-post-csrs" include="generated/kubeadm_alpha_phase_bootstrap-token_node_allow-post-csrs.md" />}} {{< /tabs >}}

kubeadm alpha phase upload-config

You can use this command to upload the kubeadm configuration to your cluster. Alternatively, you can use kubeadm config.

{{< tabs name="upload-config" >}} {{< tab name="mark-master" include="generated/kubeadm_alpha_phase_upload-config.md" />}} {{< /tabs >}}

kubeadm alpha phase addon

You can install all the available addons with the all subcommand, or install them selectively.

Please note that if kubeadm is invoked with --feature-gates=CoreDNS=true, CoreDNS is installed instead of kube-dns.

{{< tabs name="tab-addon" >}} {{< tab name="all" include="generated/kubeadm_alpha_phase_addon_all.md" />}} {{< tab name="kube-proxy" include="generated/kubeadm_alpha_phase_addon_kube-proxy.md" />}} {{< tab name="kube-dns" include="generated/kubeadm_alpha_phase_addon_kube-dns.md" />}} {{< /tabs >}}

kubeadm alpha phase self-hosting

{{< caution >}} Caution: Self-hosting is an alpha feature. See kubeadm init documentation for self-hosting limitations. {{< /caution >}}

{{< tabs name="tab-self-hosting" >}} {{< tab name="self-hosting" include="generated/kubeadm_alpha_phase_selfhosting_convert-from-staticpods.md" />}} {{< /tabs >}}

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