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cri: add notes about changing cgroup driver (#13899)

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Lubomir I. Ivanov
2019-04-22 03:35:43 +03:00
committed by Kubernetes Prow Robot
parent 4cc435a67c
commit 0311519fd2
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content/en/docs/setup/cri.md
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@@ -53,6 +53,14 @@ for the rest of the processes running on the node becomes unstable under resourc
Changing the settings such that your container runtime and kubelet use `systemd` as the cgroup driver
stabilized the system. Please note the `native.cgroupdriver=systemd` option in the Docker setup below.
{{< caution >}}
Changing the cgroup driver of a Node that has joined a cluster is highly unrecommended.
If the kubelet has created Pods using the semantics of one cgroup driver, changing the container
runtime to another cgroup driver can cause errors when trying to re-create the PodSandbox
for such existing Pods. Restarting the kubelet may not solve such errors. The recommendation
is to drain the Node from its workloads, remove it from the cluster and re-join it.
{{< /caution >}}
## Docker
On each of your machines, install Docker.