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Added warning for cgroups to single node docker #4251

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Added warning for cgroups to single node docker #4251

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Added warning for cgroups to single node docker
dgiebert Aug 11, 2022
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Implement feedback
dgiebert Aug 18, 2022
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Remove incorrect coma
dgiebert Aug 18, 2022
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14 changes: 14 additions & 0 deletions ...er/v2.6/en/installation/other-installation-methods/single-node-docker/_index.md
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Expand Up @@ -186,6 +186,20 @@ Refer to [this page](./advanced) for details.

Refer to [this page](./troubleshooting) for frequently asked questions and troubleshooting tips.

### Known Issues

Newer operating systems switched to [cgroups v2](https://docs.kernel.org/admin-guide/cgroup-v2.html) instead of the older cgroups v1, which will make the rancher/rancher container crash.
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To see wether your system is effected, check for the existence of the cgroup.controller:
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```bash
$ cat /sys/fs/cgroup/cgroup.controllers

cpuset cpu io memory hugetlb pids rdma
```

In this case it is recommend to use a local single node k3s Kubernetes cluster ([k3s](https://rancher.com/docs/k3s/latest/en/installation/install-options/) + [helm](https://rancher.com/docs/rancher/v2.6/en/installation/install-rancher-on-k8s/))
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## What's Next?

- **Recommended:** Review [Single Node Backup and Restore]({{<baseurl>}}/rancher/v2.6/en/backups/docker-installs). Although you don't have any data you need to back up right now, we recommend creating backups after regular Rancher use.
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