I'm trying to use Auto Scaling groups in AWS to create and manage instances created from AMIs with encrypted snapshots, which have been encrypted by a CMK owned by a different AWS account. This allows the other account to be able to take those snapshots and restore an instance. If you need you can copy data to a new disk without CMK. It also prevents you from sharing AMIs You can change the encryption keys according to your requirements. CMKs can be shared with other accounts. 4. 2. I keep . To perform a backup to S3 Repository, a snapshot replication or a restore using Customer Master Keys (CMKs), you need to allow IAM Roles to use Encryption Keys involved in the task. Today’s topic is about encryption data with AWS. 1. AWS prevents you from sharing snapshots that were encrypted with your default CMK. "When you share an encrypted snapshot, you must also share the customer managed CMK used to encrypt the snapshot. Changes AWS Outposts now supports EBS local snapshots on Outposts that allows customers to store snapshots of For example, its possible to setup a RDS Database encrypted with CMK, then share a snapshot and the CMK with another account. Whether you enable encryption by default or in individual creation operations, you can override the default key for EBS encryption and select a symmetric customer managed CMK. […] AWS prevents you from sharing snapshots that were encrypted with your default CMK. Even if you have not enabled encryption by default, you can enable encryption when you create an individual volume or snapshot. Specify IMAGE_MANAGEMENT to create a lifecycle policy that manages the lifecycle of EBS-backed AMIs. If the CMK feature is enabled for a disk, it can’t be disabled. What should you do at first to protect your data? 3. Only supported Software and HSM RSA keys with 2048 bit, 3072 bit, and 4096-bit sizes. That is, AWS says, Data classification, which is private/critical or not. As far as i know you can't make your encrypted snapshots available publicly but you can share an encrypted snapshot, you must share the customer managed CMK used to encrypt the snapshot You can highlight the text above to change formatting and highlight code. Here we go! 1. Once enabled for a Recovery Services vault, encryption using customer-managed keys can't be reverted back to using platform-managed keys (default). Snapshots that you intend to share must instead be encrypted with a customer managed CMK." Like EBS volumes, snapshots in AMIs can be encrypted by either your default AWS Key Management Service customer master key (CMK), or to a customer managed key that you specify. Managed disk created from custom image or snapshot which is encrypted using SSE & CMK must use same CMK to encrypt. Specify EBS_SNAPSHOT_MANAGEMENT to create a lifecycle policy that manages the lifecycle of Amazon EBS snapshots. 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