小花狸监控,使用Golang编写
预计监控内容
1.主机CPU,内存,磁盘使用率
2.Redis
3.Mongodb
4.MySQL
5.Oracle
6.LVS(*)
7.KeepAlived(*)

图难于其易,为大于其细
下面是使用Golang获取主机资源使用率
Golang语言非常简单直观.和使用命令直接获取几乎无异.

package main

import (
    "encoding/json"
    "io/ioutil"
    "log"
    "os/exec"
    "strconv"
    "strings"
    "syscall"
)

type Disk struct {
    Name string `json:name`
    All uint64 `json:all`
    Used uint64 `json:used`
    Free uint64 `json:free`
}

func (this *Disk) DiskUsage() {
    fs := syscall.Statfs_t{}
    err := syscall.Statfs(this.Name, &fs)
    if err != nil {
        this.All = 0
        this.Free = 0
        this.Used = 0
    }
    this.All = fs.Blocks * uint64(fs.Bsize)
    this.Free = fs.Bavail * uint64(fs.Bsize)
    this.Used = this.All - fs.Bfree*uint64(fs.Bsize)
}

type Memory struct {
    AllMemory uint64 `json:allmemory`
    UsedMemory uint64 `json:usedmemory`
    FreeMemory uint64 `json:freememory`
}

func (this *Memory) MemoryUsage() {
    cmd := exec.Command("/bin/bash", "-c", `free -m | awk 'NR==3 {print $3"TAB"$4}'`)
    stdout, _ := cmd.StdoutPipe()
    cmd.Start()
    bytes, _ := ioutil.ReadAll(stdout)
    data := strings.Split(string(bytes), "TAB")
    this.UsedMemory, _ = strconv.ParseUint(data[0], 10, 64)
    this.FreeMemory, _ = strconv.ParseUint(strings.Trim(data[1], "\n"), 10, 64)
    this.AllMemory = this.UsedMemory + this.FreeMemory
}

type Host struct {
    Root Disk `json:root`
    Data Disk `json:data`
    Dbdata Disk `json:dbdata`
    Memory
    Cpu
}

func (this *Host) HostUsage() {
    this.MemoryUsage()
    this.Root.DiskUsage()
    this.Data.DiskUsage()
    this.Dbdata.DiskUsage()
    this.Cpu.CpuUsage()
}

type Cpu struct {
    CpuIdle float64
}

func (this *Cpu) CpuUsage() {
    cmd := exec.Command("/bin/bash", "-c", `top -b -n 1 | grep Cpu | awk -F"," '{print $4}' | sed 's/%id//g;s/^ //g'`)
    stdout, _ := cmd.StdoutPipe()
    cmd.Start()
    bytes, _ := ioutil.ReadAll(stdout)
    cpuidle, _ := strconv.ParseFloat(strings.Trim(string(bytes), "\n"), 64)
    this.CpuIdle = cpuidle
}

func main() {
    log.SetFlags(log.Lshortfile | log.LstdFlags)
    host := &Host{
        Root: Disk{Name: "/"},
        Data: Disk{Name: "/data"},
        Dbdata: Disk{Name: "/dbdata"}}
    host.HostUsage()
    result, _ := json.Marshal(host)
    log.Println(string(result))
}

程序输出结果:
{
"Root": {
"Name": "/",
"All": 50519138304,
"Used": 6723317760,
"Free": 41229537280
},
"Data": {
"Name": "/data",
"All": 50519138304,
"Used": 6723317760,
"Free": 41229537280
},
"Dbdata": {
"Name": "/dbdata",
"All": 0,
"Used": 0,
"Free": 0
},
"AllMemory": 7872,
"UsedMemory": 916,
"FreeMemory": 6956,
"CpuIdle": 99.9
}

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小花狸监控之主机状态

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