Implement code before or after Lambda function snapshots
You can use runtime hooks to implement code before Lambda creates a snapshot or after Lambda resumes a function from a snapshot. Runtime hooks are useful for a variety of purposes, such as:
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Cleanup and initialization: Before a snapshot is created, you can use a runtime hook to perform cleanup or resource release operations. After a snapshot is restored, you can use a runtime hook to re-initialize any resources or state that were not captured in the snapshot.
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Dynamic configuration: You can use runtime hooks to dynamically update configuration or other metadata before a snapshot is created or after it is restored. This can be useful if your function needs to adapt to changes in the runtime environment.
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External integrations: You can use runtime hooks to integrate with external services or systems, such as sending notifications or updating external state, as part of the checkpointing and restoration process.
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Performance tuning: You can use runtime hooks to fine-tune your function's startup sequence, such as by preloading dependencies. For more information, see Performance tuning.
The following pages explain how to implement runtime hooks for your preferred runtime.