← Back to Blog
IT Tips AWS

Building Auto Scaling System with LB, ASG on AWS

This blog lists the sequences of AWS services you have to setup for a scalable system. It is not required to setup in this sequence, but I found it is one of straight forward and the easiest way.

AWS Certificate Manger

Create SSL certificate for your system URL and import it. You can reimport for update.

EC2 - Key Pairs & Security Groups

Create key pair to use. EC2->Network & Security -> Key Pairs

The user name of Ubuntu is Ubuntu not like other EC2 instances.

Create Security Group for CE2 instances(Web Server) and RDS(DB Server)

Dev Server

  • Create one EC2 instance. This can be used as your dev. server.
  • Configure your system on it.
  • Create and Install SSL certificate. Do not set up redirect from HTTP to HTTPS. Auto Scaling Group listener will do the redirection.
  • Lastly, create AMI Image fro Auto Scaling Group.

Launch Template

  • Select the AMI image created from Dev Server.
  • Select Actions -> Modify template(Create new version) to update Auto Scaling Group.
  • Change Default version by clicking Actions -> Set default version

Auto Scaling Groups

  • Create Sale in & Scale out Policy (Step Scaling)
  • Create CloudWatch Alarm for Sacle in and Scale out Policy.

Load Balancers

  • Your system URL should be assigned here.
  • Create a Target Group to include instances from the Auto Scaling Group.
  • Make sure Stickiness is enabled if your system uses sessions.
  • Setup Listeners for HTTP(80) and HTTPS(443)

RDS

  • Create one Parameter Group in Amazon RDS with "max_allowed_packet: 64000000"
  • Modify cluster to have this new parameter group
  • Reboot DB instances.

AWS WAF - Web ACLs

Make if sure to set IP sets if it has in-bound and/or out-bound API call to call/listen.