[CRI-O] systemd cgroup manager did not receive slice as parent

[rkevin-arch]

Hi! I'm using the following command to test out CRI-O:

sudo ~/go/bin/bucketbench run -b examples/crio.yaml

It gives the following error:

ERRO[0008] Command failed with error: error during bench validate: Driver validation: error creating test container: rpc error: code = Unknown desc = cri-o configured with systemd cgroup manager, but did not receive slice as parent: default

I was able to fix the error by changing

bucketbench/contrib/sandbox_config.json

Line 36 in 4c8d0c2

"cgroup_parent": "default",

from default to default.slice, but this probably only applies to people using the systemd cgroup manager and would break anyone using cgroupfs.

[estesp]

Sounds like something I can deal with in documentation and providing another example config for systemd cgroup configurations.