利用 cloudwatch 監控 ec2 instance 的 記憶體/磁碟使用率

環境: Ubuntu 14.04

1. 安裝相依套件

sudo apt-get install unzip libwww-perl libdatetime-perl

2. 下載 script

cd ~/
curl http://aws-cloudwatch.s3.amazonaws.com/downloads/CloudWatchMonitoringScripts-1.2.1.zip -O
unzip CloudWatchMonitoringScripts-1.2.1.zip
rm CloudWatchMonitoringScripts-1.2.1.zip
cd aws-scripts-mon

3. 把 script 加到 cronjob 定期執行

*/5 * * * * ~/aws-scripts-mon/mon-put-instance-data.pl --mem-util --disk-space-util --disk-path=/ --from-cron

記得請先建立以下權限的 policy
cloudwatch:GetMetricStatistics
cloudwatch:ListMetrics
cloudwatch:PutMetricData
ec2:DescribeTags

4. AWS 建立一個 IAM policy

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "AwsScriptsMonCW",
            "Effect": "Allow",
            "Action": [
                "cloudwatch:GetMetricStatistics",
                "cloudwatch:ListMetrics",
                "cloudwatch:PutMetricData"
            ],
            "Resource": [
                "*"
            ]
        },
        {
            "Sid": "AwsScriptsMonEC2",
            "Effect": "Allow",
            "Action": [
                "ec2:DescribeTags"
            ],
            "Resource": [
                "*"
            ]
        }
    ]
}

在這邊因為我們 ubuntu 是一個 ec2 instance 所以不用設定 AWSAccessKeyId 、 AWSSecretKey

你可以在 CloudWatch 的 Linux System Metrics 找到剛剛的 log 了

記得設定 Alarm 阿