AWS Service: Auto Scaling & SNS

 Auto Scaling:

– When the load is increasing in Load Balancers autoscaling will automatically increase the instances in Load balancers

– Practical steps:

• create an AMI 

• use the AMI for the Autoscaling configurations 

• Add the AMI in Launch configuration 

• Now create the rule using Auto scaling groups 

• create an ALB and attach it to the auto-scaling group. 

– Launch autoscale:

– Create Autoscaling:

– Instance created automatically:

– Tested with Load Balancer:

• Target tracking - it will increase or decrease with a single value 

• step scaling - step by step 

• simple scaling - overall increase

– To check autoscale adding load to CPU:

– Sample script to increase CPU load:

Inside machine:

vi load.sh

#!/bin/bash

dd if=/dev/zero of=/dev/null bs=50000 count=1000000

vi for.sh

#!/bin/bash

for i in {1..10}

do

        sh load.sh

done

chmod a+x load.sh

chmod a+x for.sh

– Instance launched automatically:

– Automatically attached to Load Balancer:

– Mail alert for Autoscaling:

To create a notification in auto-scaling we need a service called SNS

Simple Notification Service