Support #17271
closed
document that compute nodes need to use cgroupsv1 / cgroupsfs for Docker
Description
If you have the following versions
linux kernel > 4.x
systemd > 247 (en debian family)
docker > 20.10
Is very likely that you have cgroupsv2 enable by default. You can check by doing
if [ -e /sys/fs/cgroup/cgroup.controllers ] then echo "cgroupsV2 enabled" fi
Unfortunately Arvados 2.1 doesn't have support for cgrupsV2 so compute nodes need to have this disabled
this can be done by adding `systemd.unified_cgroup_hierarchy=0` to the kernel parameters.
Debian / Ubuntu:
in /etc/default/grub make sure that you have
GRUB_CMDLINE_LINUX="systemd.unified_cgroup_hierarchy=0"
update-grub
Fedora 31
dnf install -y grubby grubby --update-kernel=ALL --args=”systemd.unified_cgroup_hierarchy=0"
Updated by
Updated by Nico César almost 4 years ago
4fe66210fc0d20cceda33cfb954b5feaf3d19ba3 17271-doc-cgroupv2
Updated by Lucas Di Pentima almost 4 years ago
I think it would be useful to explain why cgroups v2 accounting should be turned off, and if the fact of having it enabled makes the system completely fail or just some specific feature to not work properly.
I'm thinking that a preexisting Slurm Cluster admin who is looking for installing Arvados in it may wonder if it's a hard requirement or if they could live with the limitations related to keeping cgroups v2 turned on in the case that it's required by other cluster services.
Other than that, it LGTM.
Updated by Nico César almost 4 years ago
addressing #note-6 4091da044 17271-doc-cgroupv2
Updated by Anonymous almost 4 years ago
- % Done changed from 0 to 100
- Status changed from In Progress to Resolved
Applied in changeset arvados|fc3531079e960359afb1039a5fd24a059a813baa.