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Docker EXPOSE and KMS Key Names: Common Misconceptions Explained

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A developer working through KodeKloud Engineer tasks uncovered three quietly misleading behaviors in Docker and AWS KMS. In Docker, inline comments after instructions are treated as arguments rather than ignored, and the EXPOSE directive only documents intended ports without actually publishing them — that requires the -p flag at runtime. Running Apache in a container also demands the foreground flag to prevent Docker from stopping the process immediately after startup. On the AWS side, the aws kms create-key command has no name parameter; what users call a key name is actually a separate alias resource that must be created and linked to the key's UUID independently.

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