Solution 1
I was not able to run podman stats on RHEL8. The command returned:
Error: stats is not supported in rootless mode without cgroups v2Solution based on this article -> https://sleeplessbeastie.eu/2021/09/10/how-to-enable-control-group-v2/
vi /etc/default/grub
and append systemd.unified_cgroup_hierarchy=1 to make it like
GRUB_CMDLINE_LINUX="console=tty0 console=ttyS0,115200n8 no_timer_check net.ifnames=0 crashkernel=auto systemd.unified_cgroup_hierarchy=1"
Rebuild grub config
grub2-mkconfig -o "$(readlink -e /etc/grub2.conf)"
Reboot system
init 6
Run it again
podman stats -a --no-stream
ID NAME CPU % MEM USAGE / LIMIT MEM % NET IO BLOCK IO PIDS CPU TIME AVG CPU %
1a6dad44f8be ansible_runner_66 4.39% 1.013GB / 17GB 5.96% -- / -- -- / -- 198 1m12.078589s 4.39%
276a8a3dba1a ansible_runner_64 4.39% 1.013GB / 17GB 5.96% -- / -- -- / -- 198 1m12.078655s 4.39%
2be1402c870c ansible_runner_70 4.39% 1.013GB / 17GB 5.96% -- / -- -- / -- 198 1m12.078821s 4.39%
a5ec1b29c8f5 ansible_runner_72 4.39% 1.013GB / 17GB 5.96% -- / -- -- / -- 198 1m12.079041s 4.39%
d691d440957f ansible_runner_68 4.39% 1.013GB / 17GB 5.96% -- / -- -- / -- 198 1m12.079041s 4.39%Happy dayz
Solution 2
Update Grub
sudo grubby --update-kernel=ALL --args='systemd.unified_cgroup_hierarchy'
sudo reboot
Tune cgroups
sudo mkdir /etc/systemd/system/[email protected]
sudo cat > /etc/systemd/system/[email protected]/delegate.conf<<EOF
[Service]
Delegate=cpu cpuset io memory pids
EOF
sudo systemctl daemon-reload
Should that be /etc/grub2.cfg above? I found /etc/grub2.cfg but not /etc/grub2.conf on my RHEL 8.8 VMs.