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CloudWatch自定义EC2内存度量和警报,具有自动缩放策略

amazon-cloudwatch autoscaling amazon-ec2 amazon-web-services

Luis · 技术社区 · 8 年前

我的目标是根据EC2实例上使用的内存测试自动缩放。

为了监视EC2实例内存,我在EC2实例上安装了CloudWatch代理,并创建和配置了CloudWatch代理配置文件,如下所述: https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/Install-CloudWatch-Agent.html https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/create-cloudwatch-agent-configuration-file.html

{
        "metrics": {
                "append_dimensions": {
                        "AutoScalingGroupName": "${aws:AutoScalingGroupName}",
                        "ImageId": "${aws:ImageId}",
                        "InstanceId": "${aws:InstanceId}",
                        "InstanceType": "${aws:InstanceType}"
                },
                "metrics_collected": {
                        "cpu": {
                                "measurement": [
                                        "cpu_usage_idle",
                                        "cpu_usage_iowait",
                                        "cpu_usage_user",
                                        "cpu_usage_system"
                                ],
                                "metrics_collection_interval": 60,
                                "totalcpu": false
                        },
                        "disk": {
                                "measurement": [
                                        "used_percent",
                                        "inodes_free"
                                ],
                                "metrics_collection_interval": 60,
                                "resources": [
                                        "*"
                                ]
                        },
                        "diskio": {
                                "measurement": [
                                        "io_time"
                                ],
                                "metrics_collection_interval": 60,
                                "resources": [
                                        "*"
                                ]
                        },
                        "mem": {
                                "measurement": [
                                        "mem_used_percent"
                                ],
                                "metrics_collection_interval": 60
                        },
                        "swap": {
                                "measurement": [
                                        "swap_used_percent"
                                ],
                                "metrics_collection_interval": 60
                        }
                }
        }
}

一旦我在EC2实例上启动了CloudWatch代理,定制指标就可以正常工作,我可以在CloudWatch上看到它们。

sudo /opt/aws/amazon-cloudwatch-agent/bin/amazon-cloudwatch-agent-ctl -a fetch-config -m ec2 -c ssm:configuration-parameter-store-name -s

我用这个EC2实例创建了一个AMI,并用这个AMI创建了一个自动缩放组。然后,我根据自定义指标“mem\u used\u percent”(当>=50时)设置了一个警报,并将其用作自动缩放组策略(添加1个实例)。图像已附加。

我连接到EC2实例,并使用“压力”增加所使用的内存。发出警报,触发自动缩放策略并创建新的EC2实例。

我看到的问题是,我在一个特定的EC2实例上创建了一个警报,而不是在整个自动缩放组上,并且一旦初始EC2实例终止,警报就不再有意义了。除了自动缩放组,我如何配置相同的想法?

谢谢

2 回复 | 直到 8 年前

qkhanhpro 8 年前

根据AWS文件,

对于CloudWatch代理,您可以使用 aggregation_dimensions

"metrics": {
  "cpu":{...}
  "disk":{...}
  "aggregation_dimensions" : [["AutoScalingGroupName"], ["InstanceId", "InstanceType"]]
}

https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/CloudWatch-Agent-common-scenarios.html

对于仍在使用旧perl脚本的用户,请检查以下选项:

--aggregated
--auto-scaling

https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/mon-scripts.html

Vivek Jha 8 年前

我也采取了同样的方法,但没有成功。

{
"metrics": {
    "metrics_collected": {
        "LogicalDisk": {
            "measurement": [
                "% Free Space"
            ],
            "metrics_collection_interval": 60,
            "resources": [
                "*"
            ]
        },
        "Memory": {
            "measurement": [
                "% Committed Bytes In Use"
            ],
            "metrics_collection_interval": 60
        },
        "Paging File": {
            "measurement": [
                "% Usage"
            ],
            "metrics_collection_interval": 60,
            "resources": [
                "*"
            ]
        },
        "PhysicalDisk": {
            "measurement": [
                "% Disk Time"
            ],
            "metrics_collection_interval": 60,
            "resources": [
                "*"
            ]
        },
        "Processor": {
            "measurement": [
                "% User Time",
                "% Idle Time",
                "% Interrupt Time"
            ],
            "metrics_collection_interval": 60,
            "resources": [
                "_Total"
            ]
        }
    },
    "append_dimensions": {
        "ImageId": "${aws:ImageId}",
        "InstanceId": "${aws:InstanceId}",
        "InstanceType": "${aws:InstanceType}",
        "AutoScalingGroupName": "${aws:AutoScalingGroupName}"
    },
    "aggregation_dimensions" : [["AutoScalingGroupName"]]
}

}

当我在cloudwatch管理控制台中查看输出时,我没有在All下看到AutoScalingGroupName的聚合>CWAgent