💤 What is EC2 Hibernate in AWS?

EC2 Hibernate is a feature that allows you to pause your Amazon EC2 instance and resume it later without losing in-memory data. It works similar to closing your laptop lid — your OS, processes, and memory (RAM) are saved to disk, and the instance can be restored exactly as it was.

🧠 How EC2 Hibernate Works:

• When hibernation is triggered (manually or automatically),
• The contents of RAM are saved to the root EBS volume,
• The instance stops (not terminated),
• When restarted, memory is reloaded, and the OS continues as if nothing happened.

🧩 Key Benefits:

✅ Requirements for EC2 Hibernate:

• Supported instance types (e.g., C5, M5, T3, R5, etc.)
• Instance must use Amazon EBS for root volume
• Less than 150 GB RAM
• Hibernation enabled at launch
• Encrypted root volume

⚠️ Hibernate vs Stop vs Terminate

💻 Use Cases:

• Long-running data science experiments
• Infrequent dev/test environments
• Pause/resume applications with large startup states