1. create EC2 instance

2. in the advance setting section, there is option to add bash script. The given example is for creating web server and create index.html

                     #!/bin/bash
                    sudo su
                    yum -y install httpd
                    echo "<p> My Instance! </p>" >> /var/www/html/index.html
                    sudo systemctl enable httpd
                    sudo systemctl start httpd