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Billy Tat
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docs/getting-started/installation-and-upgrade/installation-requirements/dockershim.md
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@@ -7,31 +7,33 @@ The Dockershim is the CRI compliant layer between the Kubelet and the Docker dae
RKE clusters now support the external Dockershim to continue leveraging Docker as the CRI runtime. We now implement the upstream open source community external Dockershim announced by [Mirantis and Docker](https://www.mirantis.com/blog/mirantis-to-take-over-support-of-kubernetes-dockershim-2/) to ensure RKE clusters can continue to leverage Docker.
To enable the external Dockershim, configure the following option.
To enable the external Dockershim in versions of RKE before 1.24, configure the following option.
```
enable_cri_dockerd: true
```
Starting with version 1.24, the above defaults to true.
For users looking to use another container runtime, Rancher has the edge-focused K3s and datacenter-focused RKE2 Kubernetes distributions that use containerd as the default runtime. Imported RKE2 and K3s Kubernetes clusters can then be upgraded and managed through Rancher going forward.
### FAQ
<br/>
Q. Do I have to upgrade Rancher to get Rancher’s support of the upstream Dockershim?
Q: Do I have to upgrade Rancher to get Rancher’s support of the upstream external Dockershim replacement?
A The upstream support of Dockershim begins for RKE in Kubernetes 1.21. You will need to be on a version of Rancher that supports RKE 1.21. See our support matrix for details.
A: The upstream support of the Dockershim replacement `cri_dockerd` begins for RKE in Kubernetes 1.21. You will need to be on a version of Rancher that supports RKE 1.21. See our support matrix for details.
<br/>
Q. I am currently on RKE with Kubernetes 1.20. Do I need to upgrade to RKE with Kubernetes 1.21 sooner to avoid being out of support for Dockershim?
Q: I am currently on RKE with Kubernetes 1.23. What happens when upstream finally removes Dockershim in 1.24?
A. The version of Dockershim in RKE with Kubernetes 1.20 will continue to work and it is not deprecated until a later release. For information on the timeline, see the [Kubernetes Dockershim Deprecation FAQ](https://kubernetes.io/blog/2020/12/02/dockershim-faq/#when-will-dockershim-be-removed). It will only emit a warning of its future deprecation, which Rancher has mitigated in RKE with Kubernetes 1.21. You can plan your upgrade to 1.21 as you would normally.
A: The version of Dockershim in RKE with Kubernetes will continue to work until 1.23. For information on the timeline, see the [Kubernetes Dockershim Deprecation FAQ](https://kubernetes.io/blog/2020/12/02/dockershim-faq/#when-will-dockershim-be-removed). After this, starting in 1.24, RKE will default to enabling `cri_dockerd` by default and will continue to do for versions afterwards.
<br/>
Q: What are my other options if I don’t want to depend on the Dockershim?
Q: What are my other options if I don’t want to depend on the Dockershim or cri_dockerd?
A: You can use a runtime like containerd with Kubernetes that does not require Dockershim support. RKE2 or K3s are two options for doing this.