Running MongoDB within a Singularity container

Question

I built a Singularity container with the MongoDB software in it, and wanted to execute it, calling systemctl start mongod in the %runscript section.
This results in the output

Running in chroot, ignoring request: start

Are there some additional configurations I need to do in my container setup?
Or in configuring MongoDB?
I'm not familiar in dealing with chroot.

Answer 1

Singularity works by having all processes run inside the container as the user running it. systemctl starts a daemon (generally) owned by a service account, which is why it is failing. You'll want to run mongo with your desired params / config file directly.

This example repo is a bit dated, but should still work: https://github.com/singularityhub/mongo