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2024/3/17

Golang 取得AWS EBS Volume CloudWatch metric統計資料

Go以Google API Client Libraries來取得EBS Volume metric統計資料。


事前要求

參考「Golang 取得AWS CloudWatch metric統計資料」。


取得EBS metric統計資料

呼叫cloudwatch.Client.GetMetricStatistics,傳入cloudwatch.GetMetricStatisticsInput參數來取得EBS metric統計資料。

cloudwatch.GetMetricStatisticsInput欄位如下:

  • MetricName - 填入指標(metric)名稱VolumeReadBytes
  • StartTime - 統計起始時間,這邊為目前時間前1小時。
  • EndTime - 統計結束時間,這邊為目前時間。
  • Period - 這邊為600即為600秒,也就是每10分鐘統計一次。
  • NamceSpace - Metrics命名空間名稱AWS/EBS
  • Statistics - 統計指標,這裡為Sum,即period區間總和。
  • Dimensions - 這邊要查循的維度為VolumeId,值為EBS的[Volume ID]。

main.go

package main

import (
    "context"
    "fmt"
    "sort"
    "time"

    "github.com/aws/aws-sdk-go-v2/aws"
    "github.com/aws/aws-sdk-go-v2/config"
    "github.com/aws/aws-sdk-go-v2/service/cloudwatch"
    "github.com/aws/aws-sdk-go-v2/service/cloudwatch/types"
)

func main() {
    ctx := context.TODO()
    client := NewCloudWatchClient(ctx)

    output, err := client.GetMetricStatistics(ctx, &cloudwatch.GetMetricStatisticsInput{
        MetricName: aws.String("VolumeReadBytes"),
        StartTime:  aws.Time(time.Now().Add(-time.Hour * 1)),
        EndTime:    aws.Time(time.Now()),
        Period:     aws.Int32(600),
        Namespace:  aws.String("AWS/EBS"),
        Statistics: []types.Statistic{types.StatisticSum},
        Dimensions: []types.Dimension{
            {
                Name:  aws.String("VolumeId"),
                Value: aws.String("vol-02a899c6436c371a5"),
            },
        },
    })
    if err != nil {
        panic(err)
    }

    dataPoints := output.Datapoints
    sort.Slice(dataPoints, func(i, j int) bool {
        return dataPoints[i].Timestamp.Before(*dataPoints[j].Timestamp)
    })

    for _, point := range output.Datapoints {
        fmt.Println(*point.Timestamp)
        fmt.Println(*point.Sum)
        fmt.Println(point.Unit)
        fmt.Println("========================================")
    }
}

func NewCloudWatchClient(ctx context.Context) *cloudwatch.Client {
    cfg, err := config.LoadDefaultConfig(
        ctx,
        config.WithRegion("ap-northeast-1"),
    )
    if err != nil {
        panic(err)
    }

    return cloudwatch.NewFromConfig(cfg) // Create an Amazon CloudWatch service client
}

github



測試

執行Go應用程式印出以下。

2024-03-18 05:05:00 +0000 UTC
1.41999616e+08
Bytes
========================================
2024-03-18 05:15:00 +0000 UTC
1.75415296e+08
Bytes
========================================
2024-03-18 05:25:00 +0000 UTC
3.97312e+06
Bytes
========================================


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