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logrotate.go
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logrotate.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 logrotate
import (
"k8s.io/utils/pointer"
extensionsv1alpha1 "github.com/gardener/gardener/pkg/apis/extensions/v1alpha1"
)
// Config returns the content for logrotate units and files.
// Whenever logrotate is ran, this config will:
// - rotate the log file if its size is > 100Mb OR if one day has elapsed
// - save rotated logs into a gzipped timestamped backup
// - log file timestamp (controlled by 'dateformat') includes seconds too. This
// ensures that logrotate can generate unique logfiles during each rotation
// (otherwise it skips rotation if 'maxsize' is reached multiple times in a
// day).
// - keep only 14 old (rotated) logs, and will discard older logs.
//
// prefix carries the target container runtime such as (containerd, docker)
func Config(pathConfig, pathLogFiles, prefix string) ([]extensionsv1alpha1.Unit, []extensionsv1alpha1.File) {
var (
extUnit []extensionsv1alpha1.Unit
extFile []extensionsv1alpha1.File
)
extUnit = []extensionsv1alpha1.Unit{
{
Name: prefix + "-logrotate.service",
Enable: pointer.Bool(true),
Content: pointer.String(`[Unit]
Description=Rotate and Compress System Logs
[Service]
ExecStart=/usr/sbin/logrotate -s /var/lib/` + prefix + `-logrotate.status ` + pathConfig + `
[Install]
WantedBy=multi-user.target`),
},
{
Name: prefix + "-logrotate.timer",
Command: pointer.String("start"),
Enable: pointer.Bool(true),
Content: pointer.String(`[Unit]
Description=Log Rotation at each 10 minutes
[Timer]
OnCalendar=*:0/10
AccuracySec=1min
Persistent=true
[Install]
WantedBy=multi-user.target`),
},
}
extFile = []extensionsv1alpha1.File{
{
Path: pathConfig,
Permissions: pointer.Int32(0644),
Content: extensionsv1alpha1.FileContent{
Inline: &extensionsv1alpha1.FileContentInline{
Data: pathLogFiles + ` {
rotate 14
copytruncate
missingok
notifempty
compress
maxsize 100M
daily
dateext
dateformat -%Y%m%d-%s
create 0644 root root
}
`,
},
},
},
}
return extUnit, extFile
}