forked from google/cadvisor
/
info.go
192 lines (164 loc) · 5.57 KB
/
info.go
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// Copyright 2014 Google Inc. All Rights Reserved.
//
// 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 machine
import (
"bytes"
"flag"
"fmt"
"io/ioutil"
"path/filepath"
"strconv"
"strings"
"github.com/docker/docker/pkg/parsers/operatingsystem"
"github.com/google/cadvisor/fs"
info "github.com/google/cadvisor/info/v1"
"github.com/google/cadvisor/utils/cloudinfo"
"github.com/google/cadvisor/utils/sysfs"
"github.com/google/cadvisor/utils/sysinfo"
"github.com/golang/glog"
"golang.org/x/sys/unix"
)
const hugepagesDirectory = "/sys/kernel/mm/hugepages/"
var machineIdFilePath = flag.String("machine_id_file", "/etc/machine-id,/var/lib/dbus/machine-id", "Comma-separated list of files to check for machine-id. Use the first one that exists.")
var bootIdFilePath = flag.String("boot_id_file", "/proc/sys/kernel/random/boot_id", "Comma-separated list of files to check for boot-id. Use the first one that exists.")
func getInfoFromFiles(filePaths string) string {
if len(filePaths) == 0 {
return ""
}
for _, file := range strings.Split(filePaths, ",") {
id, err := ioutil.ReadFile(file)
if err == nil {
return strings.TrimSpace(string(id))
}
}
glog.Warningf("Couldn't collect info from any of the files in %q", filePaths)
return ""
}
// GetHugePagesInfo returns information about pre-allocated huge pages
func GetHugePagesInfo() ([]info.HugePagesInfo, error) {
var hugePagesInfo []info.HugePagesInfo
files, err := ioutil.ReadDir(hugepagesDirectory)
if err != nil {
// treat as non-fatal since kernels and machine can be
// configured to disable hugepage support
return hugePagesInfo, nil
}
for _, st := range files {
nameArray := strings.Split(st.Name(), "-")
pageSizeArray := strings.Split(nameArray[1], "kB")
pageSize, err := strconv.ParseUint(string(pageSizeArray[0]), 10, 64)
if err != nil {
return hugePagesInfo, err
}
numFile := hugepagesDirectory + st.Name() + "/nr_hugepages"
val, err := ioutil.ReadFile(numFile)
if err != nil {
return hugePagesInfo, err
}
var numPages uint64
// we use sscanf as the file as a new-line that trips up ParseUint
// it returns the number of tokens successfully parsed, so if
// n != 1, it means we were unable to parse a number from the file
n, err := fmt.Sscanf(string(val), "%d", &numPages)
if err != nil || n != 1 {
return hugePagesInfo, fmt.Errorf("could not parse file %v contents %q", numFile, string(val))
}
hugePagesInfo = append(hugePagesInfo, info.HugePagesInfo{
NumPages: numPages,
PageSize: pageSize,
})
}
return hugePagesInfo, nil
}
func Info(sysFs sysfs.SysFs, fsInfo fs.FsInfo, inHostNamespace bool) (*info.MachineInfo, error) {
rootFs := "/"
if !inHostNamespace {
rootFs = "/rootfs"
}
cpuinfo, err := ioutil.ReadFile(filepath.Join(rootFs, "/proc/cpuinfo"))
clockSpeed, err := GetClockSpeed(cpuinfo)
if err != nil {
return nil, err
}
memoryCapacity, err := GetMachineMemoryCapacity()
if err != nil {
return nil, err
}
hugePagesInfo, err := GetHugePagesInfo()
if err != nil {
return nil, err
}
filesystems, err := fsInfo.GetGlobalFsInfo()
if err != nil {
glog.Errorf("Failed to get global filesystem information: %v", err)
}
diskMap, err := sysinfo.GetBlockDeviceInfo(sysFs)
if err != nil {
glog.Errorf("Failed to get disk map: %v", err)
}
netDevices, err := sysinfo.GetNetworkDevices(sysFs)
if err != nil {
glog.Errorf("Failed to get network devices: %v", err)
}
topology, numCores, err := GetTopology(sysFs, string(cpuinfo))
if err != nil {
glog.Errorf("Failed to get topology information: %v", err)
}
systemUUID, err := sysinfo.GetSystemUUID(sysFs)
if err != nil {
glog.Errorf("Failed to get system UUID: %v", err)
}
realCloudInfo := cloudinfo.NewRealCloudInfo()
cloudProvider := realCloudInfo.GetCloudProvider()
instanceType := realCloudInfo.GetInstanceType()
instanceID := realCloudInfo.GetInstanceID()
machineInfo := &info.MachineInfo{
NumCores: numCores,
CpuFrequency: clockSpeed,
MemoryCapacity: memoryCapacity,
HugePages: hugePagesInfo,
DiskMap: diskMap,
NetworkDevices: netDevices,
Topology: topology,
MachineID: getInfoFromFiles(filepath.Join(rootFs, *machineIdFilePath)),
SystemUUID: systemUUID,
BootID: getInfoFromFiles(filepath.Join(rootFs, *bootIdFilePath)),
CloudProvider: cloudProvider,
InstanceType: instanceType,
InstanceID: instanceID,
}
for i := range filesystems {
fs := filesystems[i]
inodes := uint64(0)
if fs.Inodes != nil {
inodes = *fs.Inodes
}
machineInfo.Filesystems = append(machineInfo.Filesystems, info.FsInfo{Device: fs.Device, DeviceMajor: uint64(fs.Major), DeviceMinor: uint64(fs.Minor), Type: fs.Type.String(), Capacity: fs.Capacity, Inodes: inodes, HasInodes: fs.Inodes != nil})
}
return machineInfo, nil
}
func ContainerOsVersion() string {
os, err := operatingsystem.GetOperatingSystem()
if err != nil {
os = "Unknown"
}
return os
}
func KernelVersion() string {
uname := &unix.Utsname{}
if err := unix.Uname(uname); err != nil {
return "Unknown"
}
return string(uname.Release[:bytes.IndexByte(uname.Release[:], 0)])
}