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Why am I writing this?
I recently encountered a situation at work where I needed to launch new EC2 instances through an Auto Scaling Group (ASG) in a cross-account setup. This experience inspired me to create a concise guide that I could share with others who might face similar scenarios in the future. So here I am!
What is AMI and why we need it ?
Amazon Machine Images (AMIs) are pre-configured templates for your virtual machines (EC2 instances) in Amazon Web Services (AWS). They contain all necessary information to launch an instance, including the operating system, application server, and applications. AMIs enable you to launch instances with a consistent setup, ensuring that your environments are identical every time.
- Consistency: Ensures that all EC2 instances have the same configuration.
- Scalability: Quickly launch multiple instances with the same configuration.
- Backup and Recovery: Take snapshots of your instances to easily recover or clone environments.
- Deployment: Streamline the process of deploying applications by pre-installing software and dependencies.
