# Storage ## Blob storage ### Access control Azure portal uses "Access key" authentication method by default. This means storage account key is used for authentication. Authentication method can be switched to Azure AD user account from blob container overview page. ### Syncing objects from AWS S3 bucket to blob container Objects can be synced from AWS S3 bucket to Azure blob container using AzCopy. For example: ```bash azcopy cp "https://$BUCKET_NAME.s3.$AWS_REGION.amazonaws.com" "https://$STORAGE_ACCOUNT_NAME.blob.core.windows.net/$CONTAINER_NAME" --recursive ``` It seems that AzCopy can only read AWS credentials from `AWS_ACCESS_KEY_ID` and `AWS_SECRET_ACCESS_KEY` environment variables. So, those need to be exported. If session credentials are used, `AWS_SESSION_TOKEN` needs to be also exported. On the Azure side, the data layer has in a sense its own access policies. Even though, an user has Owner role in subscription, blob data level roles might need to be added. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://notes.tatusl.dev/azure/storage.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.