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cloudinit.go
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cloudinit.go
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/*
Copyright 2019 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package cloudinit
import (
"bytes"
_ "embed"
"fmt"
"text/template"
"github.com/pkg/errors"
bootstrapv1 "sigs.k8s.io/cluster-api/bootstrap/kubeadm/api/v1beta1"
)
const (
standardJoinCommand = "kubeadm join --config /run/kubeadm/kubeadm-join-config.yaml %s"
// sentinelFileCommand writes a file to /run/cluster-api to signal successful Kubernetes bootstrapping in a way that
// works both for Linux and Windows OS.
sentinelFileCommand = "echo success > /run/cluster-api/bootstrap-success.complete"
retriableJoinScriptName = "/usr/local/bin/kubeadm-bootstrap-script"
retriableJoinScriptOwner = "root"
retriableJoinScriptPermissions = "0755"
cloudConfigHeader = `## template: jinja
#cloud-config
`
)
// BaseUserData is shared across all the various types of files written to disk.
type BaseUserData struct {
Header string
PreKubeadmCommands []string
PostKubeadmCommands []string
AdditionalFiles []bootstrapv1.File
WriteFiles []bootstrapv1.File
Users []bootstrapv1.User
NTP *bootstrapv1.NTP
DiskSetup *bootstrapv1.DiskSetup
Mounts []bootstrapv1.MountPoints
ControlPlane bool
UseExperimentalRetry bool
KubeadmCommand string
KubeadmVerbosity string
SentinelFileCommand string
}
func (input *BaseUserData) prepare() error {
input.Header = cloudConfigHeader
input.WriteFiles = append(input.WriteFiles, input.AdditionalFiles...)
input.KubeadmCommand = fmt.Sprintf(standardJoinCommand, input.KubeadmVerbosity)
if input.UseExperimentalRetry {
input.KubeadmCommand = retriableJoinScriptName
joinScriptFile, err := generateBootstrapScript(input)
if err != nil {
return errors.Wrap(err, "failed to generate user data for machine joining control plane")
}
input.WriteFiles = append(input.WriteFiles, *joinScriptFile)
}
input.SentinelFileCommand = sentinelFileCommand
return nil
}
func generate(kind string, tpl string, data interface{}) ([]byte, error) {
tm := template.New(kind).Funcs(defaultTemplateFuncMap)
if _, err := tm.Parse(filesTemplate); err != nil {
return nil, errors.Wrap(err, "failed to parse files template")
}
if _, err := tm.Parse(commandsTemplate); err != nil {
return nil, errors.Wrap(err, "failed to parse commands template")
}
if _, err := tm.Parse(ntpTemplate); err != nil {
return nil, errors.Wrap(err, "failed to parse ntp template")
}
if _, err := tm.Parse(usersTemplate); err != nil {
return nil, errors.Wrap(err, "failed to parse users template")
}
if _, err := tm.Parse(diskSetupTemplate); err != nil {
return nil, errors.Wrap(err, "failed to parse disk setup template")
}
if _, err := tm.Parse(fsSetupTemplate); err != nil {
return nil, errors.Wrap(err, "failed to parse fs setup template")
}
if _, err := tm.Parse(mountsTemplate); err != nil {
return nil, errors.Wrap(err, "failed to parse mounts template")
}
t, err := tm.Parse(tpl)
if err != nil {
return nil, errors.Wrapf(err, "failed to parse %s template", kind)
}
var out bytes.Buffer
if err := t.Execute(&out, data); err != nil {
return nil, errors.Wrapf(err, "failed to generate %s template", kind)
}
return out.Bytes(), nil
}
var (
//go:embed kubeadm-bootstrap-script.sh
kubeadmBootstrapScript string
)
func generateBootstrapScript(input interface{}) (*bootstrapv1.File, error) {
joinScript, err := generate("JoinScript", kubeadmBootstrapScript, input)
if err != nil {
return nil, errors.Wrap(err, "failed to bootstrap script for machine joins")
}
return &bootstrapv1.File{
Path: retriableJoinScriptName,
Owner: retriableJoinScriptOwner,
Permissions: retriableJoinScriptPermissions,
Content: string(joinScript),
}, nil
}