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component.go
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component.go
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// Copyright 2021 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 docker
import (
"bytes"
_ "embed"
"text/template"
"github.com/Masterminds/sprig"
"k8s.io/utils/pointer"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
extensionsv1alpha1 "github.com/gardener/gardener/pkg/apis/extensions/v1alpha1"
"github.com/gardener/gardener/pkg/operation/botanist/component/extensions/operatingsystemconfig/original/components"
"github.com/gardener/gardener/pkg/operation/botanist/component/extensions/operatingsystemconfig/original/components/docker/logrotate"
"github.com/gardener/gardener/pkg/utils"
)
var (
tplNameHealthMonitor = "health-monitor"
//go:embed templates/scripts/health-monitor.tpl.sh
tplContentHealthMonitor string
tplHealthMonitor *template.Template
)
func init() {
var err error
tplHealthMonitor, err = template.
New(tplNameHealthMonitor).
Funcs(sprig.TxtFuncMap()).
Parse(tplContentHealthMonitor)
if err != nil {
panic(err)
}
}
const (
// UnitName is the name of the Docker service unit.
UnitName = v1beta1constants.OperatingSystemConfigUnitNameDockerService
// UnitNameMonitor is the name of the Docker monitor service unit.
UnitNameMonitor = "docker-monitor.service"
// PathBinary is the path to the docker binary.
PathBinary = "/usr/bin/docker"
// ContainerRuntime designates the runtime type.
ContainerRuntime = "docker"
)
type component struct{}
// New returns a new docker component.
func New() *component {
return &component{}
}
func (component) Name() string {
return ContainerRuntime
}
func (component) Config(_ components.Context) ([]extensionsv1alpha1.Unit, []extensionsv1alpha1.File, error) {
const (
pathHealthMonitor = v1beta1constants.OperatingSystemConfigFilePathBinaries + "/health-monitor-docker"
pathLogRotateConfig = "/etc/systemd/docker.conf"
)
var healthMonitorScript bytes.Buffer
if err := tplHealthMonitor.Execute(&healthMonitorScript, nil); err != nil {
return nil, nil, err
}
logRotateUnits, logRotateFiles := logrotate.Config(pathLogRotateConfig, "/var/lib/docker/containers/*/*.log", ContainerRuntime)
return append([]extensionsv1alpha1.Unit{
{
Name: UnitNameMonitor,
Command: pointer.String("start"),
Enable: pointer.Bool(true),
Content: pointer.String(`[Unit]
Description=Docker-monitor daemon
After=` + UnitName + `
[Install]
WantedBy=multi-user.target
[Service]
Restart=always
EnvironmentFile=/etc/environment
ExecStart=` + pathHealthMonitor),
},
}, logRotateUnits...),
append([]extensionsv1alpha1.File{
{
Path: pathHealthMonitor,
Permissions: pointer.Int32(0755),
Content: extensionsv1alpha1.FileContent{
Inline: &extensionsv1alpha1.FileContentInline{
Encoding: "b64",
Data: utils.EncodeBase64(healthMonitorScript.Bytes()),
},
},
},
}, logRotateFiles...),
nil
}