sigs.k8s.io/cluster-api@v1.7.1/bootstrap/kubeadm/internal/cloudinit/controlplane_join.go (about)

     1  /*
     2  Copyright 2019 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 cloudinit
    18  
    19  import (
    20  	"github.com/pkg/errors"
    21  
    22  	"sigs.k8s.io/cluster-api/util/secret"
    23  )
    24  
    25  const (
    26  	controlPlaneJoinCloudInit = `{{.Header}}
    27  {{template "files" .WriteFiles}}
    28  -   path: /run/kubeadm/kubeadm-join-config.yaml
    29      owner: root:root
    30      permissions: '0640'
    31      content: |
    32  {{.JoinConfiguration | Indent 6}}
    33  -   path: /run/cluster-api/placeholder
    34      owner: root:root
    35      permissions: '0640'
    36      content: "This placeholder file is used to create the /run/cluster-api sub directory in a way that is compatible with both Linux and Windows (mkdir -p /run/cluster-api does not work with Windows)"
    37  runcmd:
    38  {{- template "commands" .PreKubeadmCommands }}
    39    - {{ .KubeadmCommand }} && {{ .SentinelFileCommand }}
    40  {{- template "commands" .PostKubeadmCommands }}
    41  {{- template "ntp" .NTP }}
    42  {{- template "users" .Users }}
    43  {{- template "disk_setup" .DiskSetup}}
    44  {{- template "fs_setup" .DiskSetup}}
    45  {{- template "mounts" .Mounts}}
    46  `
    47  )
    48  
    49  // ControlPlaneJoinInput defines context to generate controlplane instance user data for control plane node join.
    50  type ControlPlaneJoinInput struct {
    51  	BaseUserData
    52  	secret.Certificates
    53  	BootstrapToken    string
    54  	JoinConfiguration string
    55  }
    56  
    57  // NewJoinControlPlane returns the user data string to be used on a new control plane instance.
    58  func NewJoinControlPlane(input *ControlPlaneJoinInput) ([]byte, error) {
    59  	// TODO: Consider validating that the correct certificates exist. It is different for external/stacked etcd
    60  	input.WriteFiles = input.Certificates.AsFiles()
    61  	input.ControlPlane = true
    62  	if err := input.prepare(); err != nil {
    63  		return nil, err
    64  	}
    65  	userData, err := generate("JoinControlplane", controlPlaneJoinCloudInit, input)
    66  	if err != nil {
    67  		return nil, errors.Wrapf(err, "failed to generate user data for machine joining control plane")
    68  	}
    69  
    70  	return userData, err
    71  }