/
component.go
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/
component.go
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// Copyright (c) 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 promtail
import (
"fmt"
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"
"github.com/gardener/gardener/pkg/utils/images"
"github.com/gardener/gardener/pkg/utils/imagevector"
)
const (
// UnitName is the name of the promtail service.
UnitName = v1beta1constants.OperatingSystemConfigUnitNamePromtailService
unitNameFetchToken = "promtail-fetch-token.service"
// PathDirectory is the path for the promtail's directory.
PathDirectory = "/var/lib/promtail"
// PathFetchTokenScript is the path to a script which fetches promtail's token for communication with the Loki
// sidecar proxy.
PathFetchTokenScript = PathDirectory + "/scripts/fetch-token.sh"
// PathAuthToken is the path for the file containing promtail's authentication token for communication with the Loki
// sidecar proxy.
PathAuthToken = PathDirectory + "/auth-token"
// PathConfig is the path for the promtail's configuration file.
PathConfig = v1beta1constants.OperatingSystemConfigFilePathPromtailConfig
// PathCACert is the path for the loki-tls certificate authority.
PathCACert = PathDirectory + "/ca.crt"
// ServerPort is the promtail listening port.
ServerPort = 3001
// PositionFile is the path for storing the scraped file offsets.
PositionFile = "/var/log/positions.yaml"
)
type component struct{}
// New returns a new promtail component.
func New() *component {
return &component{}
}
func (component) Name() string {
return "promtail"
}
func execStartPreCopyBinaryFromContainer(binaryName string, image *imagevector.Image) string {
return docker.PathBinary + ` run --rm -v ` + v1beta1constants.OperatingSystemConfigFilePathBinaries + `:` + v1beta1constants.OperatingSystemConfigFilePathBinaries + `:rw --entrypoint /bin/sh ` + image.String() + ` -c "cp /usr/bin/` + binaryName + ` ` + v1beta1constants.OperatingSystemConfigFilePathBinaries + `"`
}
func (component) Config(ctx components.Context) ([]extensionsv1alpha1.Unit, []extensionsv1alpha1.File, error) {
if !ctx.PromtailEnabled {
return []extensionsv1alpha1.Unit{
getPromtailUnit(
"/bin/systemctl disable "+UnitName,
fmt.Sprintf(`/bin/sh -c "echo service %s is removed!; while true; do sleep 86400; done"`, UnitName),
),
getFetchTokenScriptUnit(
"/bin/systemctl disable "+unitNameFetchToken,
fmt.Sprintf(`/bin/sh -c "rm -f `+PathAuthToken+`; echo service %s is removed!; while true; do sleep 86400; done"`, unitNameFetchToken),
),
}, nil, nil
}
promtailConfigFile, err := getPromtailConfigurationFile(ctx)
if err != nil {
return nil, nil, err
}
fetchTokenScriptFile, err := getFetchTokenScriptFile()
if err != nil {
return nil, nil, err
}
return []extensionsv1alpha1.Unit{
getPromtailUnit(
execStartPreCopyBinaryFromContainer("promtail", ctx.Images[images.ImageNamePromtail]),
v1beta1constants.OperatingSystemConfigFilePathBinaries+`/promtail -config.file=`+PathConfig,
),
getFetchTokenScriptUnit(
"",
PathFetchTokenScript,
),
},
[]extensionsv1alpha1.File{
promtailConfigFile,
fetchTokenScriptFile,
getPromtailCAFile(ctx),
}, nil
}