LC has updated the documentation for how to use containers on LC HPC systems. The documentation can be found here: https://hpc.llnl.gov/documentation/user-guides/using-containers-lc-hpc-systems.
It is important to note that containers are not supported on CORAL 1 systems such as Lassen and Sierra. If you have questions about migrating off of these systems onto supported systems, please reach out to us.
We have a new mailing list! If you have questions about using containers in LC, please send us an email at lc-containers@llnl.gov.