Traditionally, SQL Server Linux container images could be downloaded from Microsoft Container Registry (mcr.microsoft.com) and mssql-server-linux. However, as you might be aware, we stopped updating the old repo, Microsoft/mssql-server-linux, a couple of years ago, as part of our move to a single source Microsoft Container Registry (mcr.microsoft.com), while still allowing multiple channels of discovery.
We are now fully deactivating the Microsoft/mssql-server-linux repository. A couple of years ago, we updated the old Docker Hub page with the above information and pointed to the current Docker Hub page, where all the old and latest SQL Server container Linux-based images can be downloaded from Microsoft Container Registry. As a result, we will disable the source “microsoft/mssql-server-linux” by May 31, 2021.
Please upgrade to the Microsoft Container Registry if you are still using the old source. For more details on how you can download from the Microsoft Container registry, refer to the latest Docker Hub page.
Source: Microsoft Blog – SQL Server News – Microsoft SQL Server Linux-based container images to be available only from the Microsoft Container Registry