/
bootstrap.go
80 lines (68 loc) · 3.33 KB
/
bootstrap.go
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// Copyright 2023 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// 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 bootstrap
import (
"context"
_ "embed"
"fmt"
"path"
"github.com/go-logr/logr"
"github.com/spf13/afero"
nodeagentcomponent "github.com/gardener/gardener/pkg/component/extensions/operatingsystemconfig/original/components/nodeagent"
"github.com/gardener/gardener/pkg/nodeagent/apis/config"
nodeagentv1alpha1 "github.com/gardener/gardener/pkg/nodeagent/apis/config/v1alpha1"
"github.com/gardener/gardener/pkg/nodeagent/dbus"
)
// Bootstrap bootstraps the gardener-node-agent by adding and starting its systemd unit and afterward disabling the
// gardener-node-init. If `kubeletDataVolumeSize` is non-zero, it formats the data device.
func Bootstrap(
ctx context.Context,
log logr.Logger,
fs afero.Afero,
dbus dbus.DBus,
bootstrapConfig *config.BootstrapConfiguration,
) error {
log.Info("Starting bootstrap procedure")
if bootstrapConfig != nil && bootstrapConfig.KubeletDataVolumeSize != nil {
log.Info("Start kubelet data volume formatter", "kubeletDataVolumeSize", *bootstrapConfig.KubeletDataVolumeSize)
if err := formatKubeletDataDevice(log.WithName("kubelet-data-volume-device-formatter"), fs, *bootstrapConfig.KubeletDataVolumeSize); err != nil {
return fmt.Errorf("failed formatting kubelet data volume: %w", err)
}
}
unitFilePath := path.Join("/", "etc", "systemd", "system", nodeagentv1alpha1.UnitName)
log.Info("Writing unit file for gardener-node-agent", "path", unitFilePath)
if err := fs.WriteFile(unitFilePath, []byte(nodeagentcomponent.UnitContent()), 0644); err != nil {
return fmt.Errorf("unable to write unit file %q to path %q: %w", nodeagentv1alpha1.UnitName, unitFilePath, err)
}
log.Info("Reloading systemd daemon")
if err := dbus.DaemonReload(ctx); err != nil {
return fmt.Errorf("failed reloading systemd daemon: %w", err)
}
log.Info("Enabling gardener-node-agent unit")
if err := dbus.Enable(ctx, nodeagentv1alpha1.UnitName); err != nil {
return fmt.Errorf("unable to enable unit %q: %w", nodeagentv1alpha1.UnitName, err)
}
log.Info("Starting gardener-node-agent unit")
if err := dbus.Start(ctx, nil, nil, nodeagentv1alpha1.UnitName); err != nil {
return fmt.Errorf("unable to start unit %q: %w", nodeagentv1alpha1.UnitName, err)
}
log.Info("Disabling gardener-node-init unit")
if err := dbus.Disable(ctx, nodeagentv1alpha1.InitUnitName); err != nil {
return fmt.Errorf("unable to disable system unit %q: %w", nodeagentv1alpha1.InitUnitName, err)
}
// After this line, the execution of the gardener-node-agent bootstrap command terminates. It is not possible to
// perform any logic after this line.
log.Info("Bootstrap procedure finished, terminating")
return nil
}