cloudwatch_nginx_connections.sh

AWS_ACCESS_KEY_ID="YOURAWSACCESSKEYID"
AWS_SECRET_KEY="YOURAWSSECRETKEY"
EC2_REGION=$(wget -q -O -  http://169.254.169.254/latest/dynamic/instance-identity/document | grep region | awk -F\" '{print $4}')
EC2_INSTANCE_ID=$(wget -q -O - http://169.254.169.254/latest/meta-data/instance-id)
EC2_CLOUDWATCH_NAMESPACE='WebService'
NGINX_CONNECTIONS=$(wget -q -O -  http://127.0.0.1/nginx_status | grep 'connections' | awk '{print $3}')
/usr/bin/mon-put-data --region \"$EC2_REGION\" --metric-name HttpConnections --namespace \"$EC2_CLOUDWATCH_NAMESPACE\" --dimensions \"InstanceId=$EC2_INSTANCE_ID\" --value \"$NGINX_CONNECTIONS\" -I \"$AWS_ACCESS_KEY_ID\" -S \"$AWS_SECRET_KEY\"

install_cloudwatch_cli_ubuntu_12.04.sh

apt-add-repository ppa:awstools-dev/awstools
apt-get update
apt-get install moncli

reference:

nginx show active connections => http://www.lowendguide.com/3/monitoring/nginx-show-active-connections/

awstool => http://alestic.com/2012/05/aws-command-line-packages

publish custom metric => http://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/publishingMetrics.html

find region from linux cli => http://stackoverflow.com/questions/4249488/find-region-from-within-ec2-instance

why we cannot insert cloudwatch values into AWS/EC2 namespace => http://stackoverflow.com/questions/7345277/how-do-i-publish-per-instance-metrics-in-the-aws-ec2-namespace-for-amazon-cloudw

使用時請注意 API request 產生的相關費用
http://aws.amazon.com/pricing/cloudwatch/

Amazon CloudWatch Custom Metrics
$0.50 per metric per month

Amazon CloudWatch API Requests
$0.01 per 1,000 Get, List, or Put requests