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What's New in {Singularity} 4.2

This section highlights important changes in {Singularity} 4.2 that are of note to system administrators. See also the "What's New" section in the User Guide for user-facing changes.

If you are upgrading from a 3.x version of {Singularity} we recommend also reviewing the "What's New" section for 4.0.

Configuration

  • Additional directives in singularity.conf allow the use of namespaces to be restricted in native mode. See :ref:`sec:nsoptions`.
  • The new --netns-path flag takes a path to a network namespace to join when starting a container. The root user may join any network namespace. An unprivileged user can only join a network namespace specified in the new allowed netns paths directive in singularity.conf, if they are also listed in allow net users / allow net groups. Not currently supported with --fakeroot, or in --oci mode. See :ref:`sec:networkoptions`.

Requirements

  • Go 1.22.5 or above is now required to build {Singularity} due to indirect dependencies.
  • OCI-Mode now supports embedded writable overlays, which can be added to OCI-SIF files with singularity overlay create. This functionality requires fuse2fs version 1.46.6 or above.
  • {Singularity} 4.2 does not support EL 7 and SLES 12. The mainstream end-of-life dates for these distributions are 2024-06-30 and 2024-10-31 respectively.