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component.go
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component.go
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// SPDX-FileCopyrightText: 2024 SAP SE or an SAP affiliate company and Gardener contributors
//
// SPDX-License-Identifier: Apache-2.0
package containerd
import (
"bytes"
_ "embed"
"text/template"
"github.com/Masterminds/sprig/v3"
"k8s.io/utils/ptr"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
extensionsv1alpha1 "github.com/gardener/gardener/pkg/apis/extensions/v1alpha1"
"github.com/gardener/gardener/pkg/component/extensions/operatingsystemconfig/original/components"
"github.com/gardener/gardener/pkg/component/extensions/operatingsystemconfig/original/components/containerd/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 containerd service unit.
UnitName = v1beta1constants.OperatingSystemConfigUnitNameContainerDService
// UnitNameMonitor is the name of the containerd monitor service unit.
UnitNameMonitor = "containerd-monitor.service"
// PathSocketEndpoint is the path to the containerd unix domain socket.
PathSocketEndpoint = "unix:///run/containerd/containerd.sock"
// CgroupPath is the cgroup path the containerd container runtime is isolated in.
CgroupPath = "/system.slice/containerd.service"
// ContainerRuntime designates the runtime type
ContainerRuntime = "containerd"
)
type containerd struct{}
// New returns a new containerd component.
func New() *containerd {
return &containerd{}
}
func (containerd) Name() string {
return ContainerRuntime
}
func (containerd) Config(_ components.Context) ([]extensionsv1alpha1.Unit, []extensionsv1alpha1.File, error) {
const (
pathHealthMonitor = v1beta1constants.OperatingSystemConfigFilePathBinaries + "/health-monitor-containerd"
pathLogRotateConfig = "/etc/systemd/containerd.conf"
)
var healthMonitorScript bytes.Buffer
if err := tplHealthMonitor.Execute(&healthMonitorScript, nil); err != nil {
return nil, nil, err
}
logRotateUnits, logRotateFiles := logrotate.Config(pathLogRotateConfig, "/var/log/pods/*/*/*.log", ContainerRuntime)
monitorFile := extensionsv1alpha1.File{
Path: pathHealthMonitor,
Permissions: ptr.To[int32](0755),
Content: extensionsv1alpha1.FileContent{
Inline: &extensionsv1alpha1.FileContentInline{
Encoding: "b64",
Data: utils.EncodeBase64(healthMonitorScript.Bytes()),
},
},
}
monitorUnit := extensionsv1alpha1.Unit{
Name: UnitNameMonitor,
Command: ptr.To(extensionsv1alpha1.CommandStart),
Enable: ptr.To(true),
Content: ptr.To(`[Unit]
Description=Containerd-monitor daemon
After=` + UnitName + `
[Install]
WantedBy=multi-user.target
[Service]
Restart=always
EnvironmentFile=/etc/environment
ExecStart=` + pathHealthMonitor),
FilePaths: []string{monitorFile.Path},
}
return append(logRotateUnits, monitorUnit), append(logRotateFiles, monitorFile), nil
}