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condor_submit -i -append '+ContainerOS="CentOS7"'
getting the docker universe working seems simple. Install docker-io or docker-ce, add condor to the docker group, and condor_starter will detect that docker is available.
universe = docker
docker_image = dev7_and_HEP_stack
docker vs singularity
HTCondor seems to prefer singularity because it doesn't start processes from a daemon and therefore processes can be better tracked by condor. condor_ssh_to_job works with singularity.
Youtube
https://www.youtube.com/channel/UCd1UBXmZIgB4p85t2tu-gLw
Center for High Throughput Computing
These seem mostly intro-level stuff.
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/dev/shm
/dev/shm is now job-private like /tmp and /var/tmp in version 8.9
Versions
It is unlikely there will be a version 8.8.10 but instead 9.0