What’s New in SingularityCE 4.3

This section highlights important changes in SingularityCE 4.3 that are of note to system administrators. See also the “What’s New” section in the User Guide for user-facing changes.

Configuration

  • Support for libsubid. Subid mappings will be retrieved from e.g. LDAP according to nssswitch.conf if Singularity is built with libsubid support (default). If built without libsubid support, Singularity will retrieve subid directly from /etc/subid and /etc/subgid regardless of system configuration. Note that singularity config fakeroot always modifies the /etc/subid and /etc/subgid files.

Requirements & Packaging

  • Go 1.23.4 or above is now required to build SingularityCE.

  • libsubid headers are now required to build SingularityCE, unless the --without-libsubid flag is passed to mconfig.

  • EL RPM packages are built with libsubid support.

  • Ubuntu deb packages are built without libsubid support.

  • The RPM spec file no longer includes rules for SLES / openSUSE package builds, which have been untested / unsupported for some time.

  • Conmon sources are no longer bundled and built with SingularityCE. Install the conmon package from your distribution, or upstream binary, if you need to use the singularity oci commands. Note that conmon is not required for --oci mode.

Removed Features

  • Plugin fakerootcallback functionality for customizing fakeroot subid mappings has been removed. Use the libsubid integration to provide subid mappings from a custom source.