Question

In Infrastructure as Code, what does the property of &#x27;idempotency&#x27; guarantee when a deployment script is executed multiple times against the same environment?

Accepted Answer

Idempotency in Infrastructure as Code guarantees that applying a deployment script multiple times results in the exact same infrastructure state as applying it once, without causing unintended side effects or errors. When a script is idempotent, the automation tool first inspects the current state of the environment to determine if the desired configuration already exists. If the infrastructure already matches the definition provided in the script, the tool performs no changes. If the infrastructure deviates from the definition, the tool performs only the specific actions required to reach the target state. For example, if a script is written to create a virtual server and is executed twice, an idempotent system will create the server during the first run and then do nothing during the second run because it detects that the server already exists. This property ensures predictability and reliability, as it allows developers to safely re-run scripts to correct drift—which occurs when manual changes cause the actual environment to differ from the original configuration—without the risk of duplicating resources or triggering duplicate processes.

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In Infrastructure as Code, what does the property of 'idempotency' guarantee when a deployment script is executed multiple times against the same environment?