条件

サーバに権限をつける

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "cloudwatch:PutMetricData"
            ],
            "Resource": "*"
        },
        {
            "Effect": "Allow",
            "Action": [
                "ec2:DescribeInstances"
            ],
            "Resource": "*"
        }
    ]
}

Roleの検証はしていませんので、失敗する場合は他サイトをご参考にお願いします。

sudo apt-get update
sudo apt-get install collectd
sudo apt-get install awscli

vi /root/loadaverage.sh


#!/bin/bash


AWS_CLI_REGION="ap-northeast-1"
metric_name="LoadAverage"
name_space="EC2/${metric_name}"
unit="Percent"
load_average=`cut -f 1 -d " " /proc/loadavg`

# get ec2 name value
export INSTANCE_ID=$(curl -s http://169.254.169.254/latest/meta-data/instance-id)
TMP_NAME=$(aws ec2 describe-instances --region ${AWS_CLI_REGION} --instance-ids "${INSTANCE_ID}" --query 'Reservations[0].Instances[0].Tags[?Key==`Name`]|[0].Value')
NAME=`echo ${TMP_NAME} | tr -d '"'`

# put metrics
aws cloudwatch --region ${AWS_CLI_REGION} put-metric-data --namespace ${name_space} --metric-name ${metric_name} --dimensions InstanceId=${INSTANCE_ID},InstanceName=${NAME} --value ${load_average} --unit ${unit}

# vi /etc/crontab

# /etc/crontab: system-wide crontab
# Unlike any other crontab you don't have to run the `crontab'
# command to install the new version when you edit this file
# and files in /etc/cron.d. These files also have username fields,
# that none of the other crontabs do.

SHELL=/bin/sh
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin

# m h dom mon dow user  command
17 *    * * *   root    cd / && run-parts --report /etc/cron.hourly
25 6    * * *   root    test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.daily )
47 6    * * 7   root    test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.weekly )
52 6    1 * *   root    test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.monthly )

# LoadAverage
* * * * * root /root/loadaverage.sh

# systemctl restart cron

ubuntuでcronログを見る

# sudo journalctl -f -u cron