Error:

1.6.0 kubelet fails with error "misconfiguration: kubelet cgroup driver: "cgroupfs" is different from docker cgroup driver: "systemd"

Solution:

vi /etc/systemd/system/kubelet.service.d/10-kubeadm.conf

modify

KUBELET_CGROUP_ARGS=--cgroup-driver=systemd

to

KUBELET_CGROUP_ARGS=--cgroup-driver=cgroupfs