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Amazon Machine Image (AMI) serves as a foundational block in the vast ecosystem of Amazon Web Services (AWS), offering a pre-packaged operating system, application server, and applications required to launch a virtual server on Amazon’s Elastic Compute Cloud (EC2). AMIs are crucial for creating virtual machines (VMs) quickly, allowing for scalability and flexibility in cloud computing environments. This guide aims to delve into the definition, benefits, uses, and features of AMI, alongside addressing frequently asked questions related to this technology.
An AMI contains all the information necessary to boot instances of your software. When you launch an instance, the AMI you select configures the instance’s operating system, software configurations, and storage settings. The beauty of AMIs lies in their flexibility; you can choose from a wide range of AMIs that AWS or its community provides, or you can create custom AMIs tailored to your specific needs.
The primary benefits of using AMIs include:
Creating an AMI involves selecting an existing EC2 instance and using it as a template for the AMI. This process captures the instance’s current configurations, software, and patches, making it simple to replicate the environment. Managing AMIs includes sharing with specific AWS accounts, deregistering outdated AMIs, and keeping an inventory of custom and used AMIs for audit and governance purposes.
AMIs are categorized based on their operating system (Windows or Linux), region, and whether they are backed by Amazon EBS or instance store. Users can also find community AMIs that are shared by other AWS users.
To create a custom AMI, start with an existing EC2 instance, customize it as needed, and then use the AWS Management Console, AWS CLI, or an SDK to create the AMI based on this instance.
Yes, you can share your custom AMIs with specific AWS accounts or make them public to the AWS community, although sharing publicly should be done with caution to avoid exposing sensitive information.
Ensure the security of your AMI by regularly updating software and applications, removing sensitive data before creating the AMI, and using AWS Identity and Access Management (IAM) to control access.
An AMI is a template for launching EC2 instances, containing the OS, application server, and applications. A snapshot, on the other hand, is a backup of a single volume, such as an EBS volume, and does not include the necessary information to boot an instance.
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