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Updated cri-o documentation (#3878)

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Lucas Melchior 2018-12-26 00:55:17 -06:00 committed by Kubernetes Prow Robot
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docs/cri-o.md
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cri-o
CRI-O
===============
cri-o is container developed by kubernetes project.
Currently, only basic function is supported for cri-o.
[CRI-O] is a lightweight container runtime for Kubernetes.
Kubespray supports basic functionality for using CRI-O as the default container runtime in a cluster.
* cri-o is supported kubernetes 1.11.1 or later.
* helm and other feature may not be supported due to docker dependency.
* scale.yml and upgrade-cluster.yml are not supported.
* Kubernetes supports CRI-O on v1.11.1 or later.
* Helm and other tools may not function as normal due to dependency on Docker.
* `scale.yml` and `upgrade-cluster.yml` are not supported on clusters using CRI-O.
helm and other feature may not be supported due to docker dependency.
Use cri-o instead of docker, set following variable:
_To use CRI-O instead of Docker, set the following variables:_
#### all.yml
```
```yaml
download_container: false
skip_downloads: false
```
#### k8s-cluster.yml
```
```yaml
etcd_deployment_type: host
kubelet_deployment_type: host
container_manager: crio
```
[CRI-O]: https://cri-o.io/