Singularity is a container runtime that originated out of the HPC world. You can run Docker images similarly to
docker run via
singularity exec docker://atlas/analysisbase bash
The main advantage has been that singularity does not use a daemon process and is usable by non-
root users on e.g. a shared cluster such as LXPLUS. A disadvantage is that there is a slight mismatch between the two, as
singularity did not conform to the Open Container Initiative (OCI) standard for container runtimes (e.g. in
singularity the filesystem is mostly read-only). In recent releases (
singularity 3.X) this is starting to change.