Why do We Need AMI?
Let us suppose that we want to launch 5 servers with the same configuration. One way of doing that would be to launch a new EC2 instance every time and install the required packages every time. While the other way of doing it would be to configure your EC2 instance once and then create an image of that instance. Using that image you can deploy four more EC2 servers.
What is Amazon Machine Image (AMI)?Pricing Of AMI
An Amazon Machine Image is a special type of virtual appliance that is used to instantiate (create) a virtual machine within EC2. It serves as the basic unit of deployment for services delivered using EC2. Whenever you want to launch an instance, you need to specify AMI. To launch instances, you can also use different AMIs. If you want to launch multiple instances from a single AMI, then you need multiple instances of the same configuration.
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