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Hi there!
From the notes, I understand that you want to perform a PostgreSQL upgrade from engine 10.20 to 14.2 and you are currently getting an error. Please correct me if I misunderstood.
Please note that if you're creating or updating your CloudFormation stack, you can receive an "Internal Failure" error when an operation on a resource fails. You can also receive this error if your stack fails to deploy, please refer to outlined AWS documentation [1] to help you troubleshoot the issue.
However, since you also mentioned that the snapshot upgrade fails, I replicated the instance on my side with the specifications and managed to upgrade successfully through the AWS CLI.
This is the command I ran:
aws rds modify-db-snapshot --db-snapshot-identifier postgresql-cli-snapshot --engine-version 14.2
And the result:
{
"DBSnapshot": {
"DBSnapshotIdentifier": "postgresql-cli-snapshot",
"DBInstanceIdentifier": "postgresql",
"SnapshotCreateTime": "2022-07-01T12:02:33.917000+00:00",
"Engine": "postgres",
"AllocatedStorage": 100,
"Status": "upgrading",
}
I hope you find the above information helpful.
Have a great day ahead!
References:
[1] https://aws.amazon.com/premiumsupport/knowledge-center/cloudformation-internal-failure-error/
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