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You are using for sure agile methods to manage your infrastructure or deploy code on your application-systems and maybe running automatically patch-management on them.
AWS EC2-instances can be also automated and this can happen at the creation point of each single instance.
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During the configure step of the launch of an EC2 instance, you can select the drop-down block(User Data) and put your bootstrapping-script into this field.
This code gets automatically executed only once during the provisioning process of the new instance.
This is can be a very simple bash script, which helps you to start an instance with the basic configuration.
Like a webserver which can be a part of a lodbalancing group:
#!/bin/bash
yum update -y
yum install httpd -y
service httpd start
chkconfig httpd on
echo "<html><h1>welcome to web-instance01</h1></html>" > /var/www/html/index.html
There are no bootstrapping-limits, you can bootstrap everything and save your time and avoid manually steps.
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