获取通过 Java 客户端运行 AWS 实例的 CPU 利用率指标

Question

我已经从我创建的 AMI 启动了一个新实例。然后，我在该实例上启用了云监视监视。

我想要的是通过 java 客户端获取该特定实例的 CPU 利用率。我只想通过传递凭据和实例 ID 来检索该信息。我正在附加我编写的以下代码。

我遇到的问题是我无法检索 CPU 利用率指标。我在这里错过了什么吗？

import java.util.Date;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
import org.apache.http.impl.client.BasicCredentialsProvider;
import com.amazonaws.AmazonClientException;
import com.amazonaws.AmazonServiceException;
import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.AWSCredentialsProvider;
import com.amazonaws.services.cloudwatch.AmazonCloudWatch;
import com.amazonaws.services.cloudwatch.AmazonCloudWatchClient;
import com.amazonaws.services.cloudwatch.AmazonCloudWatchClientBuilder;
import com.amazonaws.services.cloudwatch.model.Datapoint;
import com.amazonaws.services.cloudwatch.model.Dimension;
import com.amazonaws.services.cloudwatch.model.GetMetricStatisticsRequest;
import com.amazonaws.services.cloudwatch.model.GetMetricStatisticsResult;
import com.amazonaws.services.cloudwatch.model.ListMetricsResult;
import software.amazon.awssdk.services.cloudwatch.model.Metric;
/**
* Lists CloudWatch metrics
*/
public class AwsCloudWatchMetrics {
final static String InstanceId = "i-xxxxxxxxxxxxx";
public static void main(String[] args) {
MonitorCPU();
}
private static void MonitorCPU() {
// AmazonCloudWatchClient cw = new AmazonCloudWatchClient(credentials);
AWSCredentialsProvider awsp = new AWSCredentialsProvider() {
@Override
public void refresh() {
// TODO Auto-generated method stub
}
@Override
public AWSCredentials getCredentials() {
AWSCredentials awsCredentials = null;
try {
awsCredentials = new AWSCredentials() {
public String getAWSSecretKey() {
return "awssecretkeygoeshere";
}
public String getAWSAccessKeyId() {
return "awsaccesskeygoeshere";
}
};
} catch (Exception e) {
throw new AmazonClientException(
"can not load your aws credentials, please check your credentials !!", e);
}
return awsCredentials;
}
};
try{
AmazonCloudWatch cw =  AmazonCloudWatchClientBuilder.standard()
.withCredentials(awsp).withRegion("us-east-2").build();
long offsetInMilliseconds = 1000 * 60 * 60 * 24 ;
Dimension dimension = new Dimension()
.withName("InstanceId")
.withValue("i-xxxxxxxxxxxxx");
GetMetricStatisticsRequest request = new GetMetricStatisticsRequest()
.withStartTime(new Date(new Date().getTime() - offsetInMilliseconds)).withNamespace("AWS/EC2")
.withPeriod(60 * 60)
.withMetricName("CPUUtilization").withStatistics("Average").withEndTime(new Date())
.withDimensions(dimension);
// Dimension().withName("InstanceType").withValue("r5.large"))
// Dimension().withName("InstanceId").withValue("i-xxxxxxxxxxxxxxxxx")
// .withMeasureName("CPUUtilization")
//withMetricName("CPUUtilization")
GetMetricStatisticsResult getMetricStatisticsResult = cw.getMetricStatistics(request);
System.out.println("request " + request.toString());
System.out.println("label : " + getMetricStatisticsResult.getLabel());
System.out.println("DataPoint Size : " + getMetricStatisticsResult.getDatapoints().size());
double avgCPUUtilization = 0;
List<Datapoint> dataPoint = getMetricStatisticsResult.getDatapoints();
for (Object aDataPoint : dataPoint) {
Datapoint dp = (Datapoint) aDataPoint;
System.out.println(" avgCPUUtilization " + avgCPUUtilization);
}
}catch(AmazonServiceException ase){
ase.printStackTrace();
}
/*
* TreeMap metricValues = new TreeMap<Long, Double>(); for (Datapoint dp
* : getMetricStatisticsResult.getDatapoints()) {
* metricValues.put(dp.getTimestamp().getTime(), dp.getAverage()); }
* 
* Set set = metricValues.entrySet(); Iterator i = set.iterator(); while
* (i.hasNext()) { Map.Entry me = (Map.Entry) i.next();
* System.out.print(me.getKey() + ": ");
* System.out.println(me.getValue()); }
*/
}
}

使用上面的代码，我总是得到零数据点和 0.0 作为 cpu 利用率，而在 aws 控制台上，对于给定的日期范围，我看到一些 CPU 峰值。

Answer 1

EC2 实例是特定于区域的，因此指向正确的区域解决了我的问题。我们需要在.withRegion()中传递正确的区域值。