mirror of
https://github.com/optim-enterprises-bv/kubernetes.git
synced 2025-11-03 19:58:17 +00:00
617 lines
17 KiB
Go
617 lines
17 KiB
Go
// Copyright 2018 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 libcontainer
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import (
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"bufio"
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"path"
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"strconv"
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"strings"
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"time"
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"github.com/google/cadvisor/container"
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info "github.com/google/cadvisor/info/v1"
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"bytes"
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"github.com/opencontainers/runc/libcontainer"
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"github.com/opencontainers/runc/libcontainer/cgroups"
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"k8s.io/klog"
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)
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/*
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#include <unistd.h>
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*/
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import "C"
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type Handler struct {
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cgroupManager cgroups.Manager
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rootFs string
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pid int
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includedMetrics container.MetricSet
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pidMetricsCache map[int]*info.CpuSchedstat
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}
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func NewHandler(cgroupManager cgroups.Manager, rootFs string, pid int, includedMetrics container.MetricSet) *Handler {
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return &Handler{
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cgroupManager: cgroupManager,
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rootFs: rootFs,
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pid: pid,
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includedMetrics: includedMetrics,
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pidMetricsCache: make(map[int]*info.CpuSchedstat),
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}
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}
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// Get cgroup and networking stats of the specified container
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func (h *Handler) GetStats() (*info.ContainerStats, error) {
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cgroupStats, err := h.cgroupManager.GetStats()
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if err != nil {
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return nil, err
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}
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libcontainerStats := &libcontainer.Stats{
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CgroupStats: cgroupStats,
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}
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withPerCPU := h.includedMetrics.Has(container.PerCpuUsageMetrics)
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stats := newContainerStats(libcontainerStats, withPerCPU)
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if h.includedMetrics.Has(container.ProcessSchedulerMetrics) {
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pids, err := h.cgroupManager.GetAllPids()
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if err != nil {
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klog.V(4).Infof("Could not get PIDs for container %d: %v", h.pid, err)
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} else {
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stats.Cpu.Schedstat, err = schedulerStatsFromProcs(h.rootFs, pids, h.pidMetricsCache)
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if err != nil {
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klog.V(4).Infof("Unable to get Process Scheduler Stats: %v", err)
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}
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}
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}
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// If we know the pid then get network stats from /proc/<pid>/net/dev
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if h.pid == 0 {
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return stats, nil
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}
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if h.includedMetrics.Has(container.NetworkUsageMetrics) {
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netStats, err := networkStatsFromProc(h.rootFs, h.pid)
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if err != nil {
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klog.V(4).Infof("Unable to get network stats from pid %d: %v", h.pid, err)
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} else {
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stats.Network.Interfaces = append(stats.Network.Interfaces, netStats...)
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}
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}
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if h.includedMetrics.Has(container.NetworkTcpUsageMetrics) {
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t, err := tcpStatsFromProc(h.rootFs, h.pid, "net/tcp")
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if err != nil {
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klog.V(4).Infof("Unable to get tcp stats from pid %d: %v", h.pid, err)
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} else {
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stats.Network.Tcp = t
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}
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t6, err := tcpStatsFromProc(h.rootFs, h.pid, "net/tcp6")
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if err != nil {
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klog.V(4).Infof("Unable to get tcp6 stats from pid %d: %v", h.pid, err)
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} else {
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stats.Network.Tcp6 = t6
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}
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}
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if h.includedMetrics.Has(container.NetworkUdpUsageMetrics) {
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u, err := udpStatsFromProc(h.rootFs, h.pid, "net/udp")
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if err != nil {
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klog.V(4).Infof("Unable to get udp stats from pid %d: %v", h.pid, err)
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} else {
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stats.Network.Udp = u
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}
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u6, err := udpStatsFromProc(h.rootFs, h.pid, "net/udp6")
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if err != nil {
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klog.V(4).Infof("Unable to get udp6 stats from pid %d: %v", h.pid, err)
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} else {
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stats.Network.Udp6 = u6
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}
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}
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if h.includedMetrics.Has(container.ProcessMetrics) {
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paths := h.cgroupManager.GetPaths()
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path, ok := paths["cpu"]
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if !ok {
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klog.V(4).Infof("Could not find cgroups CPU for container %d", h.pid)
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} else {
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stats.Processes, err = processStatsFromProcs(h.rootFs, path)
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if err != nil {
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klog.V(4).Infof("Unable to get Process Stats: %v", err)
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}
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}
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}
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// For backwards compatibility.
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if len(stats.Network.Interfaces) > 0 {
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stats.Network.InterfaceStats = stats.Network.Interfaces[0]
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}
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return stats, nil
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}
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func processStatsFromProcs(rootFs string, cgroupPath string) (info.ProcessStats, error) {
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var fdCount uint64
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filePath := path.Join(cgroupPath, "cgroup.procs")
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out, err := ioutil.ReadFile(filePath)
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if err != nil {
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return info.ProcessStats{}, fmt.Errorf("couldn't open cpu cgroup procs file %v : %v", filePath, err)
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}
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pids := strings.Split(string(out), "\n")
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// EOL is also treated as a new line while reading "cgroup.procs" file with ioutil.ReadFile.
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// The last value is an empty string "". Ex: pids = ["22", "1223", ""]
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// Trim the last value
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if len(pids) != 0 && pids[len(pids)-1] == "" {
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pids = pids[:len(pids)-1]
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}
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for _, pid := range pids {
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dirPath := path.Join(rootFs, "/proc", pid, "fd")
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fds, err := ioutil.ReadDir(dirPath)
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if err != nil {
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klog.V(4).Infof("error while listing directory %q to measure fd count: %v", dirPath, err)
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continue
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}
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fdCount += uint64(len(fds))
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}
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processStats := info.ProcessStats{
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ProcessCount: uint64(len(pids)),
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FdCount: fdCount,
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}
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return processStats, nil
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}
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func schedulerStatsFromProcs(rootFs string, pids []int, pidMetricsCache map[int]*info.CpuSchedstat) (info.CpuSchedstat, error) {
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for _, pid := range pids {
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f, err := os.Open(path.Join(rootFs, "proc", strconv.Itoa(pid), "schedstat"))
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if err != nil {
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return info.CpuSchedstat{}, fmt.Errorf("couldn't open scheduler statistics for process %d: %v", pid, err)
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}
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defer f.Close()
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contents, err := ioutil.ReadAll(f)
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if err != nil {
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return info.CpuSchedstat{}, fmt.Errorf("couldn't read scheduler statistics for process %d: %v", pid, err)
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}
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rawMetrics := bytes.Split(bytes.TrimRight(contents, "\n"), []byte(" "))
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if len(rawMetrics) != 3 {
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return info.CpuSchedstat{}, fmt.Errorf("unexpected number of metrics in schedstat file for process %d", pid)
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}
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cacheEntry, ok := pidMetricsCache[pid]
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if !ok {
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cacheEntry = &info.CpuSchedstat{}
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pidMetricsCache[pid] = cacheEntry
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}
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for i, rawMetric := range rawMetrics {
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metric, err := strconv.ParseUint(string(rawMetric), 10, 64)
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if err != nil {
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return info.CpuSchedstat{}, fmt.Errorf("parsing error while reading scheduler statistics for process: %d: %v", pid, err)
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}
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switch i {
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case 0:
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cacheEntry.RunTime = metric
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case 1:
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cacheEntry.RunqueueTime = metric
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case 2:
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cacheEntry.RunPeriods = metric
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}
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}
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}
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schedstats := info.CpuSchedstat{}
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for _, v := range pidMetricsCache {
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schedstats.RunPeriods += v.RunPeriods
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schedstats.RunqueueTime += v.RunqueueTime
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schedstats.RunTime += v.RunTime
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}
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return schedstats, nil
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}
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func networkStatsFromProc(rootFs string, pid int) ([]info.InterfaceStats, error) {
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netStatsFile := path.Join(rootFs, "proc", strconv.Itoa(pid), "/net/dev")
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ifaceStats, err := scanInterfaceStats(netStatsFile)
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if err != nil {
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return []info.InterfaceStats{}, fmt.Errorf("couldn't read network stats: %v", err)
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}
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return ifaceStats, nil
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}
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var (
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ignoredDevicePrefixes = []string{"lo", "veth", "docker"}
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)
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func isIgnoredDevice(ifName string) bool {
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for _, prefix := range ignoredDevicePrefixes {
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if strings.HasPrefix(strings.ToLower(ifName), prefix) {
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return true
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}
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}
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return false
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}
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func scanInterfaceStats(netStatsFile string) ([]info.InterfaceStats, error) {
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file, err := os.Open(netStatsFile)
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if err != nil {
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return nil, fmt.Errorf("failure opening %s: %v", netStatsFile, err)
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}
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defer file.Close()
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scanner := bufio.NewScanner(file)
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// Discard header lines
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for i := 0; i < 2; i++ {
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if b := scanner.Scan(); !b {
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return nil, scanner.Err()
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}
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}
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stats := []info.InterfaceStats{}
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for scanner.Scan() {
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line := scanner.Text()
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line = strings.Replace(line, ":", "", -1)
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fields := strings.Fields(line)
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// If the format of the line is invalid then don't trust any of the stats
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// in this file.
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if len(fields) != 17 {
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return nil, fmt.Errorf("invalid interface stats line: %v", line)
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}
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devName := fields[0]
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if isIgnoredDevice(devName) {
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continue
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}
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i := info.InterfaceStats{
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Name: devName,
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}
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statFields := append(fields[1:5], fields[9:13]...)
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statPointers := []*uint64{
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&i.RxBytes, &i.RxPackets, &i.RxErrors, &i.RxDropped,
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&i.TxBytes, &i.TxPackets, &i.TxErrors, &i.TxDropped,
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}
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err := setInterfaceStatValues(statFields, statPointers)
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if err != nil {
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return nil, fmt.Errorf("cannot parse interface stats (%v): %v", err, line)
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}
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stats = append(stats, i)
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}
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return stats, nil
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}
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func setInterfaceStatValues(fields []string, pointers []*uint64) error {
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for i, v := range fields {
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val, err := strconv.ParseUint(v, 10, 64)
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if err != nil {
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return err
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}
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*pointers[i] = val
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}
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return nil
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}
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func tcpStatsFromProc(rootFs string, pid int, file string) (info.TcpStat, error) {
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tcpStatsFile := path.Join(rootFs, "proc", strconv.Itoa(pid), file)
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tcpStats, err := scanTcpStats(tcpStatsFile)
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if err != nil {
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return tcpStats, fmt.Errorf("couldn't read tcp stats: %v", err)
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}
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return tcpStats, nil
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}
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func scanTcpStats(tcpStatsFile string) (info.TcpStat, error) {
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var stats info.TcpStat
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data, err := ioutil.ReadFile(tcpStatsFile)
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if err != nil {
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return stats, fmt.Errorf("failure opening %s: %v", tcpStatsFile, err)
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}
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tcpStateMap := map[string]uint64{
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"01": 0, //ESTABLISHED
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"02": 0, //SYN_SENT
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"03": 0, //SYN_RECV
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"04": 0, //FIN_WAIT1
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"05": 0, //FIN_WAIT2
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"06": 0, //TIME_WAIT
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"07": 0, //CLOSE
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"08": 0, //CLOSE_WAIT
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"09": 0, //LAST_ACK
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"0A": 0, //LISTEN
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"0B": 0, //CLOSING
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}
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reader := strings.NewReader(string(data))
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scanner := bufio.NewScanner(reader)
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scanner.Split(bufio.ScanLines)
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// Discard header line
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if b := scanner.Scan(); !b {
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return stats, scanner.Err()
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}
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for scanner.Scan() {
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line := scanner.Text()
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state := strings.Fields(line)
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// TCP state is the 4th field.
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// Format: sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode
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tcpState := state[3]
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_, ok := tcpStateMap[tcpState]
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if !ok {
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return stats, fmt.Errorf("invalid TCP stats line: %v", line)
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}
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tcpStateMap[tcpState]++
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}
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stats = info.TcpStat{
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Established: tcpStateMap["01"],
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SynSent: tcpStateMap["02"],
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SynRecv: tcpStateMap["03"],
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FinWait1: tcpStateMap["04"],
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FinWait2: tcpStateMap["05"],
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TimeWait: tcpStateMap["06"],
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Close: tcpStateMap["07"],
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CloseWait: tcpStateMap["08"],
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LastAck: tcpStateMap["09"],
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Listen: tcpStateMap["0A"],
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Closing: tcpStateMap["0B"],
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}
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return stats, nil
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}
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func udpStatsFromProc(rootFs string, pid int, file string) (info.UdpStat, error) {
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var err error
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var udpStats info.UdpStat
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udpStatsFile := path.Join(rootFs, "proc", strconv.Itoa(pid), file)
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r, err := os.Open(udpStatsFile)
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if err != nil {
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return udpStats, fmt.Errorf("failure opening %s: %v", udpStatsFile, err)
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}
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udpStats, err = scanUdpStats(r)
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if err != nil {
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return udpStats, fmt.Errorf("couldn't read udp stats: %v", err)
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}
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return udpStats, nil
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}
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func scanUdpStats(r io.Reader) (info.UdpStat, error) {
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var stats info.UdpStat
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scanner := bufio.NewScanner(r)
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scanner.Split(bufio.ScanLines)
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// Discard header line
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if b := scanner.Scan(); !b {
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return stats, scanner.Err()
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}
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listening := uint64(0)
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dropped := uint64(0)
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rxQueued := uint64(0)
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txQueued := uint64(0)
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for scanner.Scan() {
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line := scanner.Text()
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// Format: sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode ref pointer drops
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listening++
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fs := strings.Fields(line)
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if len(fs) != 13 {
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continue
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}
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rx, tx := uint64(0), uint64(0)
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fmt.Sscanf(fs[4], "%X:%X", &rx, &tx)
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rxQueued += rx
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txQueued += tx
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d, err := strconv.Atoi(string(fs[12]))
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if err != nil {
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continue
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}
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dropped += uint64(d)
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}
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stats = info.UdpStat{
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Listen: listening,
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Dropped: dropped,
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RxQueued: rxQueued,
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TxQueued: txQueued,
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}
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return stats, nil
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}
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func (h *Handler) GetProcesses() ([]int, error) {
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pids, err := h.cgroupManager.GetPids()
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if err != nil {
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return nil, err
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}
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return pids, nil
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}
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func minUint32(x, y uint32) uint32 {
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if x < y {
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return x
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}
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return y
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}
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// var to allow unit tests to stub it out
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var numCpusFunc = getNumberOnlineCPUs
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// Convert libcontainer stats to info.ContainerStats.
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func setCpuStats(s *cgroups.Stats, ret *info.ContainerStats, withPerCPU bool) {
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ret.Cpu.Usage.User = s.CpuStats.CpuUsage.UsageInUsermode
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ret.Cpu.Usage.System = s.CpuStats.CpuUsage.UsageInKernelmode
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ret.Cpu.Usage.Total = s.CpuStats.CpuUsage.TotalUsage
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ret.Cpu.CFS.Periods = s.CpuStats.ThrottlingData.Periods
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ret.Cpu.CFS.ThrottledPeriods = s.CpuStats.ThrottlingData.ThrottledPeriods
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ret.Cpu.CFS.ThrottledTime = s.CpuStats.ThrottlingData.ThrottledTime
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if !withPerCPU {
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return
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}
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if len(s.CpuStats.CpuUsage.PercpuUsage) == 0 {
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// libcontainer's 'GetStats' can leave 'PercpuUsage' nil if it skipped the
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// cpuacct subsystem.
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return
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}
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numPossible := uint32(len(s.CpuStats.CpuUsage.PercpuUsage))
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// Note that as of https://patchwork.kernel.org/patch/8607101/ (kernel v4.7),
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// the percpu usage information includes extra zero values for all additional
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// possible CPUs. This is to allow statistic collection after CPU-hotplug.
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// We intentionally ignore these extra zeroes.
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numActual, err := numCpusFunc()
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if err != nil {
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klog.Errorf("unable to determine number of actual cpus; defaulting to maximum possible number: errno %v", err)
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numActual = numPossible
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}
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if numActual > numPossible {
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// The real number of cores should never be greater than the number of
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// datapoints reported in cpu usage.
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klog.Errorf("PercpuUsage had %v cpus, but the actual number is %v; ignoring extra CPUs", numPossible, numActual)
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}
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numActual = minUint32(numPossible, numActual)
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ret.Cpu.Usage.PerCpu = make([]uint64, numActual)
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for i := uint32(0); i < numActual; i++ {
|
|
ret.Cpu.Usage.PerCpu[i] = s.CpuStats.CpuUsage.PercpuUsage[i]
|
|
}
|
|
|
|
}
|
|
|
|
// Copied from
|
|
// https://github.com/moby/moby/blob/8b1adf55c2af329a4334f21d9444d6a169000c81/daemon/stats/collector_unix.go#L73
|
|
// Apache 2.0, Copyright Docker, Inc.
|
|
func getNumberOnlineCPUs() (uint32, error) {
|
|
i, err := C.sysconf(C._SC_NPROCESSORS_ONLN)
|
|
// According to POSIX - errno is undefined after successful
|
|
// sysconf, and can be non-zero in several cases, so look for
|
|
// error in returned value not in errno.
|
|
// (https://sourceware.org/bugzilla/show_bug.cgi?id=21536)
|
|
if i == -1 {
|
|
return 0, err
|
|
}
|
|
return uint32(i), nil
|
|
}
|
|
|
|
func setDiskIoStats(s *cgroups.Stats, ret *info.ContainerStats) {
|
|
ret.DiskIo.IoServiceBytes = DiskStatsCopy(s.BlkioStats.IoServiceBytesRecursive)
|
|
ret.DiskIo.IoServiced = DiskStatsCopy(s.BlkioStats.IoServicedRecursive)
|
|
ret.DiskIo.IoQueued = DiskStatsCopy(s.BlkioStats.IoQueuedRecursive)
|
|
ret.DiskIo.Sectors = DiskStatsCopy(s.BlkioStats.SectorsRecursive)
|
|
ret.DiskIo.IoServiceTime = DiskStatsCopy(s.BlkioStats.IoServiceTimeRecursive)
|
|
ret.DiskIo.IoWaitTime = DiskStatsCopy(s.BlkioStats.IoWaitTimeRecursive)
|
|
ret.DiskIo.IoMerged = DiskStatsCopy(s.BlkioStats.IoMergedRecursive)
|
|
ret.DiskIo.IoTime = DiskStatsCopy(s.BlkioStats.IoTimeRecursive)
|
|
}
|
|
|
|
func setMemoryStats(s *cgroups.Stats, ret *info.ContainerStats) {
|
|
ret.Memory.Usage = s.MemoryStats.Usage.Usage
|
|
ret.Memory.MaxUsage = s.MemoryStats.Usage.MaxUsage
|
|
ret.Memory.Failcnt = s.MemoryStats.Usage.Failcnt
|
|
|
|
if s.MemoryStats.UseHierarchy {
|
|
ret.Memory.Cache = s.MemoryStats.Stats["total_cache"]
|
|
ret.Memory.RSS = s.MemoryStats.Stats["total_rss"]
|
|
ret.Memory.Swap = s.MemoryStats.Stats["total_swap"]
|
|
ret.Memory.MappedFile = s.MemoryStats.Stats["total_mapped_file"]
|
|
} else {
|
|
ret.Memory.Cache = s.MemoryStats.Stats["cache"]
|
|
ret.Memory.RSS = s.MemoryStats.Stats["rss"]
|
|
ret.Memory.Swap = s.MemoryStats.Stats["swap"]
|
|
ret.Memory.MappedFile = s.MemoryStats.Stats["mapped_file"]
|
|
}
|
|
if v, ok := s.MemoryStats.Stats["pgfault"]; ok {
|
|
ret.Memory.ContainerData.Pgfault = v
|
|
ret.Memory.HierarchicalData.Pgfault = v
|
|
}
|
|
if v, ok := s.MemoryStats.Stats["pgmajfault"]; ok {
|
|
ret.Memory.ContainerData.Pgmajfault = v
|
|
ret.Memory.HierarchicalData.Pgmajfault = v
|
|
}
|
|
|
|
workingSet := ret.Memory.Usage
|
|
if v, ok := s.MemoryStats.Stats["total_inactive_file"]; ok {
|
|
if workingSet < v {
|
|
workingSet = 0
|
|
} else {
|
|
workingSet -= v
|
|
}
|
|
}
|
|
ret.Memory.WorkingSet = workingSet
|
|
}
|
|
|
|
func setNetworkStats(libcontainerStats *libcontainer.Stats, ret *info.ContainerStats) {
|
|
ret.Network.Interfaces = make([]info.InterfaceStats, len(libcontainerStats.Interfaces))
|
|
for i := range libcontainerStats.Interfaces {
|
|
ret.Network.Interfaces[i] = info.InterfaceStats{
|
|
Name: libcontainerStats.Interfaces[i].Name,
|
|
RxBytes: libcontainerStats.Interfaces[i].RxBytes,
|
|
RxPackets: libcontainerStats.Interfaces[i].RxPackets,
|
|
RxErrors: libcontainerStats.Interfaces[i].RxErrors,
|
|
RxDropped: libcontainerStats.Interfaces[i].RxDropped,
|
|
TxBytes: libcontainerStats.Interfaces[i].TxBytes,
|
|
TxPackets: libcontainerStats.Interfaces[i].TxPackets,
|
|
TxErrors: libcontainerStats.Interfaces[i].TxErrors,
|
|
TxDropped: libcontainerStats.Interfaces[i].TxDropped,
|
|
}
|
|
}
|
|
|
|
// Add to base struct for backwards compatibility.
|
|
if len(ret.Network.Interfaces) > 0 {
|
|
ret.Network.InterfaceStats = ret.Network.Interfaces[0]
|
|
}
|
|
}
|
|
|
|
func newContainerStats(libcontainerStats *libcontainer.Stats, withPerCPU bool) *info.ContainerStats {
|
|
ret := &info.ContainerStats{
|
|
Timestamp: time.Now(),
|
|
}
|
|
|
|
if s := libcontainerStats.CgroupStats; s != nil {
|
|
setCpuStats(s, ret, withPerCPU)
|
|
setDiskIoStats(s, ret)
|
|
setMemoryStats(s, ret)
|
|
}
|
|
if len(libcontainerStats.Interfaces) > 0 {
|
|
setNetworkStats(libcontainerStats, ret)
|
|
}
|
|
return ret
|
|
}
|