Getting started with containers on LC¶

A. Background¶

1. What is Docker?
2. Docker vs. Singularity vs. Podman
3. Where containers can help you
4. Examples of when to use a container

B. How to pull or build a container¶

1. Pulling from a registry with Singularity
2. Building from a registry with Singularity
3. Building from a Dockerfile with Podman

C. How to interact with a container¶

1. How to execute a container
2. How to shell into a container
3. How to run a container
4. How to run a container in batch

D. How to change container behavior¶

1. How to change the filesystems a container sees
2. How to change a container's runscript

E. Gotchas¶

1. A note about performance
2. Competing for --userns: Multi-node allocations
3. Competing for --userns: Serially scheduled nodes
4. Memory issues with large container images