Made an oomparser that gets oomkill logs from kernel messages
Made an oomparser that gets oomkill logs from kernel messages Made an oomparser that gets oomkill logs from kernel messages Made an oomparser that gets oomkill logs from kernel messages Made an oomparser that gets oomkill logs from kernel messages Made an oomparser that gets oomkill logs from kernel messages Made an oomparser that gets oomkill logs from kernel messages
This commit is contained in:
Katie Knister
parent
6f1e95001e
commit
b5609e2942
4
.gitignore
vendored
4
.gitignore
vendored
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cadvisor
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*.swp
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*.idea
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*.iml
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44
utils/oomparser/oominfo/main.go
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44
utils/oomparser/oominfo/main.go
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// Copyright 2014 Google Inc. All Rights Reserved.
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package main
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import (
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"flag"
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"github.com/golang/glog"
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"github.com/google/cadvisor/utils/oomparser"
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)
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// demonstrates how to run oomparser.OomParser to get OomInstance information
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func main() {
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flag.Parse()
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// out is a user-provided channel from which the user can read incoming
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// OomInstance objects
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outStream := make(chan *oomparser.OomInstance)
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oomLog, err := oomparser.New()
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if err != nil {
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glog.Infof("Couldn't make a new oomparser. %v", err)
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} else {
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err := oomLog.StreamOoms(outStream)
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if err != nil {
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glog.Errorf("%v", err)
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}
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// demonstration of how to get oomLog's list of oomInstances or access
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// the user-declared oomInstance channel, here called outStream
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for oomInstance := range outStream {
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glog.Infof("Reading the buffer. Output is %v", oomInstance)
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}
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}
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}
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174
utils/oomparser/oomparser.go
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174
utils/oomparser/oomparser.go
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// Copyright 2014 Google Inc. All Rights Reserved.
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package oomparser
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import (
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"bufio"
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"fmt"
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"io"
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"os"
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"path"
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"regexp"
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"strconv"
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"time"
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"github.com/golang/glog"
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"github.com/google/cadvisor/utils"
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)
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var containerRegexp *regexp.Regexp = regexp.MustCompile(
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`Task in (.*) killed as a result of limit of `)
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var lastLineRegexp *regexp.Regexp = regexp.MustCompile(
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`(^[A-Z]{1}[a-z]{2} [0-9]{1,2} [0-9]{1,2}:[0-9]{2}:[0-9]{2}) .* Killed process ([0-9]+) \(([0-9A-Za-z_]+)\)`)
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var firstLineRegexp *regexp.Regexp = regexp.MustCompile(
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`kernel: [[0-9]+.[0-9]+] [0-9A-Za-z_]+ invoked oom-killer:`)
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// struct to hold file from which we obtain OomInstances
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type OomParser struct {
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systemFile string
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}
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// struct that contains information related to an OOM kill instance
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type OomInstance struct {
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// process id of the killed process
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Pid int
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// the name of the killed process
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ProcessName string
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// the time that the process was reported to be killed,
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// accurate to the minute
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TimeOfDeath time.Time
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// the absolute name of the container that OOMed
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ContainerName string
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}
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// gets the container name from a line and adds it to the oomInstance.
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func getContainerName(line string, currentOomInstance *OomInstance) error {
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parsedLine := containerRegexp.FindStringSubmatch(line)
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if parsedLine == nil {
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return nil
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}
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currentOomInstance.ContainerName = path.Join("/", parsedLine[1])
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return nil
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}
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// gets the pid, name, and date from a line and adds it to oomInstance
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func getProcessNamePid(line string, currentOomInstance *OomInstance) (bool, error) {
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reList := lastLineRegexp.FindStringSubmatch(line)
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if reList == nil {
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return false, nil
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}
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linetime, err := time.Parse(time.Stamp, reList[1])
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if err != nil {
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return false, err
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}
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currentOomInstance.TimeOfDeath = linetime
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if err != nil {
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return false, err
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}
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pid, err := strconv.Atoi(reList[2])
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if err != nil {
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return false, err
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}
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currentOomInstance.Pid = pid
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currentOomInstance.ProcessName = reList[3]
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return true, nil
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}
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// uses regex to see if line is the start of a kernel oom log
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func checkIfStartOfOomMessages(line string) (bool, error) {
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potential_oom_start := firstLineRegexp.MatchString(line)
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if potential_oom_start {
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return true, nil
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}
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return false, nil
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}
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// opens a reader to grab new messages from the Reader object called outPipe
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// opened in PopulateOomInformation. It reads line by line splitting on
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// the "\n" character. Checks if line might be start or end of an oom message
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// log. Then the
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// lines are checked against a regexp to check for the pid, process name, etc.
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// At the end of an oom message group, AnalyzeLines adds the new oomInstance to
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// oomLog
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func (self *OomParser) analyzeLines(outPipe io.ReadCloser, outStream chan *OomInstance) {
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ioreader := bufio.NewReader(outPipe)
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line, err := ioreader.ReadString('\n')
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for err == nil {
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in_oom_kernel_log, err := checkIfStartOfOomMessages(line)
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if err != nil {
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glog.Errorf("%v", err)
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continue
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}
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if in_oom_kernel_log {
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oomCurrentInstance := new(OomInstance)
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finished := false
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for err == nil && !finished {
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err = getContainerName(line, oomCurrentInstance)
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if err != nil {
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glog.Errorf("%v", err)
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}
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finished, err = getProcessNamePid(line, oomCurrentInstance)
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if err != nil {
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glog.Errorf("%v", err)
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}
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line, err = ioreader.ReadString('\n')
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}
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in_oom_kernel_log = false
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outStream <- oomCurrentInstance
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}
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line, err = ioreader.ReadString('\n')
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}
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glog.Errorf("%v", err)
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}
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// looks for system files that contain kernel messages and if one is found, sets
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// the systemFile attribute of the OomParser object
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func getSystemFile() (string, error) {
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const varLogMessages = "/var/log/messages"
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const varLogSyslog = "/var/log/syslog"
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if utils.FileExists(varLogMessages) {
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return varLogMessages, nil
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} else if utils.FileExists(varLogSyslog) {
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return varLogSyslog, nil
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}
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return "", fmt.Errorf("neither %s nor %s exists from which to read kernel errors", varLogMessages, varLogSyslog)
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}
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// calls a go routine that populates self.OomInstances and fills the argument
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// channel with OomInstance objects as they are read from the file.
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// opens the OomParser's systemFile which was set in getSystemFile
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// to look for OOM messages by calling AnalyzeLines. Takes in the argument
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// outStream, which is passed in by the user and passed to AnalyzeLines.
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// OomInstance objects are added to outStream when they are found by
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// AnalyzeLines
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func (self *OomParser) StreamOoms(outStream chan *OomInstance) error {
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file, err := os.Open(self.systemFile)
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if err != nil {
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return err
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}
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go self.analyzeLines(file, outStream)
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return nil
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}
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// initializes an OomParser object and calls getSystemFile to set the systemFile
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// attribute. Returns and OomParser object and an error
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func New() (*OomParser, error) {
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systemFileName, err := getSystemFile()
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if err != nil {
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return nil, err
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}
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return &OomParser{
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systemFile: systemFileName}, nil
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}
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