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Setting up a auto scaling, load-balanced, webserver with Amazon

Step 1. Define your loadbalancer
As of now, Amazon only supports 2 ports: the default web-traffic on port 80 and ssl secure https traffic on port 443.

Unfortunatly you need to choose 1 of them,  but i hope they will change it in the future. You also need to select a availabilityzone, make sure your servers are in the same zone..

elb-create-lb LoadBalancerNameHere --headers --listener "lb-port=80,instance-port=8080,protocol=HTTP" --availability-zones YourPreferedZone

Step 2. Define your LaunchConfiguration
The  LaunchConfiguration stores the ami you want to autoscale and the instancetype to go with that

as-create-launch-config LaunchConfigurationNameHer --image-id YourAmiIdHere --instance-type YourInstanceTypeHere

Step 3. Define your AutoScalingGroup
Your AutoScalingGroup combines the data from the previous 2 steps and adds the minimum and maximum amount of instances you want the auto-scaling mechanism to launch

as-create-auto-scaling-group AutoScalingGroupNameHere --launch-configuration LaunchConfigurationNameHere --availability-zones YourPreferedZone --min-size 1 --max-size 5 --load-balancers LoadBalancerNameHere

Step 4. Defining your trigger and launching it all
From the moment you define your trigger, Aws will launch what you have defined.
This example wil launch 1 instance with a trigger to add one instances to maximum of 5 when the 1 minute average CPU load has become higher than 80% for 10 minutes, and will scale down with one instance when the CPU load of the instances has been lower than 40% for 10 minutes

as-create-or-update-trigger --trigger TriggerNameHere --auto-scaling-group AutoScalingGroupNameHere --namespace "AWS/EC2" --measure CPUUtilization --statistic Average --dimensions "AutoScalingGroupName=AutoScalingGroupNameHere" --period 60 --lower-threshold 40 --upper-threshold 80 --lower-breach-increment=-1 --upper-breach-increment 1 --breach-duration 600

Step 5. Monitor and finetune
You can use the folowing to check and monitor if your setup is working

as-describe-scaling-activities AutoScalingGroupNameHere

as-describe-triggers AutoScalingGroupNameHere

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