kubelet fails to get cgroup stats for docker and kubelet services

Try to start kubelet with

--runtime-cgroups=/systemd/system.slice --kubelet-cgroups=/systemd/system.slice

I'm using this solution on RHEL7 with Kubelet 1.8.0 and Docker 1.12

The angeloxx's workaround works also on AWS default image for kops (k8s-1.8-debian-jessie-amd64-hvm-ebs-2017-12-02 (ami-bd229ec4))

sudo vim /etc/sysconfig/kubelet

add at the end of DAEMON_ARGS string:

 --runtime-cgroups=/systemd/system.slice --kubelet-cgroups=/systemd/system.slice

finally:

sudo systemctl restart kubelet

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