AWS Classroomnotes 11/Jul/2023

AWS Autoscaling

  • In EC2 instances we run our applications, as of now the approache which we are following is
    • take an OS based AMI and manually install the application
  • As number of users start using this applications the resources will be exhausted, so we do horizontal scaling (i.e. increasing ec2 instances to share the workload)
  • The problem with the above apporach is whenever ec2 instance is scaled, we need to install software in it.
  • We need to figure out a way to create an AMI with application pre-installed
  • Even if we have AMI with our application pre-installed, what can be done to give a new release.
  • AWS has a way when a new version of AMI is released then
  • To acheive this we need to create
    • AMI’s
    • Autoscaling Groups
    • Launch Templates
    • LoadBalancers
    • Target groups
    • Automate the AMI creation from ci/cd pipeline

Creating AMI

  • Create an ubuntu 22.04 AMI based EC2 instance t2.micro and login in to the ec2 instance
  • Install apache, php and stress
sudo apt update # not necessary on redhat
sudo apt install apache2 -y # sudo dnf install htttpd -y
sudo apt install stress -y
sudo apt install php libapache2-mod-php php-mysql -y # sudo dnf install php -y
sudo -i
echo "<?php phpinfo(); ?>" > /var/www/html/info.php
  • navigate to http://<public-ip>/info.php
  • Exercise:

    • Create the php info page on centos or redhat based linux instances Refer Here
    • Restart the ec2 instance and check if the apache is running or not
    • Understand what enabling the service in linux means
    • Enable the service in redhat instance
    • Restart the server and check apache should be running

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