60 lines
2.4 KiB
Go
60 lines
2.4 KiB
Go
/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package kubelet
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import (
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"fmt"
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"k8s.io/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/util/version"
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clientset "k8s.io/client-go/kubernetes"
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kubeadmconstants "k8s.io/kubernetes/cmd/kubeadm/app/constants"
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"k8s.io/kubernetes/cmd/kubeadm/app/util/apiclient"
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)
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// EnableDynamicConfigForNode updates the Node's ConfigSource to enable Dynamic Kubelet Configuration, depending on what version the kubelet is
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// Used at "kubeadm init", "kubeadm join" and "kubeadm upgrade" time
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// This func is ONLY run if the user enables the `DynamicKubeletConfig` feature gate, which is by default off
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func EnableDynamicConfigForNode(client clientset.Interface, nodeName string, kubeletVersion *version.Version) error {
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configMapName := kubeadmconstants.GetKubeletConfigMapName(kubeletVersion)
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fmt.Printf("[kubelet] Enabling Dynamic Kubelet Config for Node %q; config sourced from ConfigMap %q in namespace %s\n",
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nodeName, configMapName, metav1.NamespaceSystem)
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fmt.Println("[kubelet] WARNING: The Dynamic Kubelet Config feature is beta, but off by default. It hasn't been well-tested yet at this stage, use with caution.")
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_, err := client.CoreV1().ConfigMaps(metav1.NamespaceSystem).Get(configMapName, metav1.GetOptions{})
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if err != nil {
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return fmt.Errorf("couldn't get the kubelet configuration ConfigMap: %v", err)
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}
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// Loop on every falsy return. Return with an error if raised. Exit successfully if true is returned.
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return apiclient.PatchNode(client, nodeName, func(n *v1.Node) {
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patchNodeForDynamicConfig(n, configMapName)
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})
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}
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func patchNodeForDynamicConfig(n *v1.Node, configMapName string) {
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n.Spec.ConfigSource = &v1.NodeConfigSource{
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ConfigMap: &v1.ConfigMapNodeConfigSource{
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Name: configMapName,
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Namespace: metav1.NamespaceSystem,
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KubeletConfigKey: kubeadmconstants.KubeletBaseConfigurationConfigMapKey,
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},
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}
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}
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