Share a Snapshot Encrypted with a Default CMK
Here is a summary of the necessary steps:
2. Attach the volume to a temporary EC2 Linux instance.
3. Use the Linux ‘dd’ utility to copy the data from your encrypted volume to a newly created, unencrypted volume.
4. Create a snapshot from the unencrypted volume, and share it with the account of your choosing.
Here are the detailed steps:
Naming conventions:
i-cmk = The original instance encrypted using the default KMS CMK.
vol-cmk = The encrypted root volume of the original encrypted instance i-cmk.
i-temp = The temporary “worker instance” to perform the dd operations.
vol-new = New, unencrypted, blank volume, identical in size to vol-cmk, and in the same Availability Zone as vol-cmk. This will be used to receive the data from vol-cmk, and then to create an unencrypted snapshot that is shareable with another account.
Detailed steps:
2. Create a snapshot of vol-cmk and/or create an AMI of i-cmk. Use snapshots and AMIs to provide backups for your resources prior to performing any major tasks.
3. Take note of the i-cmk root device name in the AWS console (/dev/xvda, /dev/sda1, etc., depending upon the Linux distribution).
4. Launch a new temporary worker EC2 Linux instance (i-temp) of the same type and in the same Availability Zone as i-cmk.
6. Attach vol-cmk to your temporary worker instance i-temp (attach v-cmk to the temp instance as /dev/xvdf).
7. Create a new, unencrypted volume (vol-new) and attach it to the temporary worker instance i-temp as /dev/xvdg.
8. Connect to i-temp and confirm the presence of the root device and both attached volumes using lsblk:
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Share a Snapshot Encrypted with a Default CMK
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