uploadconfig.go

Documentation: k8s.io/kubernetes/cmd/kubeadm/app/phases/uploadconfig

     1  /*
     2  Copyright 2017 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package uploadconfig
    18  
    19  import (
    20  	"fmt"
    21  
    22  	v1 "k8s.io/api/core/v1"
    23  	rbac "k8s.io/api/rbac/v1"
    24  	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
    25  	clientset "k8s.io/client-go/kubernetes"
    26  
    27  	kubeadmapi "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm"
    28  	kubeadmapiv1 "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm/v1beta3"
    29  	kubeadmconstants "k8s.io/kubernetes/cmd/kubeadm/app/constants"
    30  	"k8s.io/kubernetes/cmd/kubeadm/app/util/apiclient"
    31  	configutil "k8s.io/kubernetes/cmd/kubeadm/app/util/config"
    32  )
    33  
    34  const (
    35  	// NodesKubeadmConfigClusterRoleName sets the name for the ClusterRole that allows
    36  	// the bootstrap tokens to access the kubeadm-config ConfigMap during the node bootstrap/discovery
    37  	// or during upgrade nodes
    38  	NodesKubeadmConfigClusterRoleName = "kubeadm:nodes-kubeadm-config"
    39  )
    40  
    41  // UploadConfiguration saves the InitConfiguration used for later reference (when upgrading for instance)
    42  func UploadConfiguration(cfg *kubeadmapi.InitConfiguration, client clientset.Interface) error {
    43  	fmt.Printf("[upload-config] Storing the configuration used in ConfigMap %q in the %q Namespace\n", kubeadmconstants.KubeadmConfigConfigMap, metav1.NamespaceSystem)
    44  
    45  	// Prepare the ClusterConfiguration for upload
    46  	// The components store their config in their own ConfigMaps, then reset the .ComponentConfig struct;
    47  	// We don't want to mutate the cfg itself, so create a copy of it using .DeepCopy of it first
    48  	clusterConfigurationToUpload := cfg.ClusterConfiguration.DeepCopy()
    49  	clusterConfigurationToUpload.ComponentConfigs = kubeadmapi.ComponentConfigMap{}
    50  
    51  	// restore the resolved Kubernetes version as CI Kubernetes version if needed
    52  	if len(clusterConfigurationToUpload.CIKubernetesVersion) > 0 {
    53  		clusterConfigurationToUpload.KubernetesVersion = clusterConfigurationToUpload.CIKubernetesVersion
    54  	}
    55  
    56  	// Marshal the ClusterConfiguration into YAML
    57  	clusterConfigurationYaml, err := configutil.MarshalKubeadmConfigObject(clusterConfigurationToUpload, kubeadmapiv1.SchemeGroupVersion)
    58  	if err != nil {
    59  		return err
    60  	}
    61  
    62  	err = apiclient.CreateOrMutateConfigMap(client, &v1.ConfigMap{
    63  		ObjectMeta: metav1.ObjectMeta{
    64  			Name:      kubeadmconstants.KubeadmConfigConfigMap,
    65  			Namespace: metav1.NamespaceSystem,
    66  		},
    67  		Data: map[string]string{
    68  			kubeadmconstants.ClusterConfigurationConfigMapKey: string(clusterConfigurationYaml),
    69  		},
    70  	}, func(cm *v1.ConfigMap) error {
    71  		// Upgrade will call to UploadConfiguration with a modified KubernetesVersion reflecting the new
    72  		// Kubernetes version. In that case, the mutation path will take place.
    73  		cm.Data[kubeadmconstants.ClusterConfigurationConfigMapKey] = string(clusterConfigurationYaml)
    74  		return nil
    75  	})
    76  	if err != nil {
    77  		return err
    78  	}
    79  
    80  	// Ensure that the NodesKubeadmConfigClusterRoleName exists
    81  	err = apiclient.CreateOrUpdateRole(client, &rbac.Role{
    82  		ObjectMeta: metav1.ObjectMeta{
    83  			Name:      NodesKubeadmConfigClusterRoleName,
    84  			Namespace: metav1.NamespaceSystem,
    85  		},
    86  		Rules: []rbac.PolicyRule{
    87  			{
    88  				Verbs:         []string{"get"},
    89  				APIGroups:     []string{""},
    90  				Resources:     []string{"configmaps"},
    91  				ResourceNames: []string{kubeadmconstants.KubeadmConfigConfigMap},
    92  			},
    93  		},
    94  	})
    95  	if err != nil {
    96  		return err
    97  	}
    98  
    99  	// Binds the NodesKubeadmConfigClusterRoleName to all the bootstrap tokens
   100  	// that are members of the system:bootstrappers:kubeadm:default-node-token group
   101  	// and to all nodes
   102  	return apiclient.CreateOrUpdateRoleBinding(client, &rbac.RoleBinding{
   103  		ObjectMeta: metav1.ObjectMeta{
   104  			Name:      NodesKubeadmConfigClusterRoleName,
   105  			Namespace: metav1.NamespaceSystem,
   106  		},
   107  		RoleRef: rbac.RoleRef{
   108  			APIGroup: rbac.GroupName,
   109  			Kind:     "Role",
   110  			Name:     NodesKubeadmConfigClusterRoleName,
   111  		},
   112  		Subjects: []rbac.Subject{
   113  			{
   114  				Kind: rbac.GroupKind,
   115  				Name: kubeadmconstants.NodeBootstrapTokenAuthGroup,
   116  			},
   117  			{
   118  				Kind: rbac.GroupKind,
   119  				Name: kubeadmconstants.NodesGroup,
   120  			},
   121  		},
   122  	})
   123  }
   124
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