mirror of
https://github.com/kubernetes/node-problem-detector.git
synced 2026-03-02 17:50:34 +00:00
532f933bd8
1) Add lookback support in kernel monitor. After started, Kernel monitor will check some old logs to detect problems which happened before last node reboot. 2) Add `lookback` and `startPattern` in kernel monitor configuration. * `lookback` specifies how long time kernel monitor should look back. * `startPattern` specifies which log indicates the node is started. kernel monitor will clear all current node conditions once it finds a node start log. This makes sure that old problems won't change the node condition. 3) Add support for kernel panic monitoring, the null pointer and divide 0 kernel panic will be surfaced as event. Usually kernel monitor will report these events during looking back phase.
86 lines
2.7 KiB
Go
86 lines
2.7 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package translator
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import (
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"fmt"
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"strings"
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"time"
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"k8s.io/node-problem-detector/pkg/kernelmonitor/types"
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)
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// Translator translates a log line into types.KernelLog, so that kernel monitor
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// could parse it whatever the original format is.
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type Translator interface {
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// Translate translates one log line into types.KernelLog.
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Translate(string) (*types.KernelLog, error)
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}
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// defaultTranslator works well for ubuntu and debian, but may not work well with
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// other os distros. However it is easy to add a new translator for new os distro.
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type defaultTranslator struct{}
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// NewDefaultTranslator creates a default translator.
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func NewDefaultTranslator() Translator {
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return &defaultTranslator{}
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}
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func (t *defaultTranslator) Translate(line string) (*types.KernelLog, error) {
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timestamp, message, err := t.parseLine(line)
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if err != nil {
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return nil, err
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}
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return &types.KernelLog{
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Timestamp: timestamp,
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Message: message,
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}, nil
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}
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var (
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timestampLen = 15
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messagePrefix = "]"
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)
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func (t *defaultTranslator) parseLine(line string) (time.Time, string, error) {
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// Trim the spaces to make sure timestamp could be found
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line = strings.TrimSpace(line)
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if len(line) < timestampLen {
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return time.Time{}, "", fmt.Errorf("the line is too short: %q", line)
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}
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// Example line: Jan 1 00:00:00 hostname kernel: [0.000000] component: log message
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now := time.Now()
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// There is no time zone information in kernel log timestamp, apply the current time
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// zone.
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timestamp, err := time.ParseInLocation(time.Stamp, line[:timestampLen], time.Local)
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if err != nil {
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return time.Time{}, "", fmt.Errorf("error parsing timestamp in line %q: %v", line, err)
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}
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// There is no year information in kernel log timestamp, apply the current year.
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// This could go wrong during looking back phase after kernel monitor is started,
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// and the old logs are generated in old year.
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timestamp = timestamp.AddDate(now.Year(), 0, 0)
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loc := strings.Index(line, messagePrefix)
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if loc == -1 {
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return timestamp, "", fmt.Errorf("can't find message prefix %q in line %q", messagePrefix, line)
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}
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message := strings.Trim(line[loc+1:], " ")
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return timestamp, message, nil
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}
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