[evrflx]

I recommend to have a look at singularity as well https://sylabs.io/ which I use successfully in the past.

[teleforce]

Does Sylabs has the capability of fully unprivileged containers as offered by Charliecloud to cater for users' applications security and flexibility [1],[2]?

[1] Minimizing privilege for building HPC containers:

https://arxiv.org/abs/2104.07508

[2] Charliecloud: Unprivileged Containers for User-Defined Software Stacks in HPC:

https://archive.fosdem.org/2018/schedule/event/containers_sc...

[evrflx]

Yes it even can be installed without root capabilities: https://docs.sylabs.io/guides/latest/admin-guide/installatio...