Warning: If you are upgrading to this version from a version lower than v1.9.5-rancher1-3, it's possible to hit an issue with kubelet failing to start after the upgrade. To work around this issue, run the following commands on the hosts:
mount -o rw,remount /sys/fs/cgroup
mount --bind /sys/fs/cgroup/cpu,cpuacct/ /sys/fs/cgroup/cpuacct,cpu/
mount --bind /sys/fs/cgroup/net_cls,net_prio/ /sys/fs/cgroup/net_prio,net_cls/
This issue is resolved in Rancher v1.6.19 with Kubernetes v1.10.5.
go directly past 1.6.22 to 1.6.23
next version 1.6.23 fixes an internal jetty CVE - https://www.eclipse.org/jetty/documentation/9.4.x/security-reports.html