Updated cri-o documentation (#3878)
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cri-o
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CRI-O
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===============
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===============
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cri-o is container developed by kubernetes project.
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[CRI-O] is a lightweight container runtime for Kubernetes.
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Currently, only basic function is supported for cri-o.
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Kubespray supports basic functionality for using CRI-O as the default container runtime in a cluster.
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* cri-o is supported kubernetes 1.11.1 or later.
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* Kubernetes supports CRI-O on v1.11.1 or later.
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* helm and other feature may not be supported due to docker dependency.
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* Helm and other tools may not function as normal due to dependency on Docker.
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* scale.yml and upgrade-cluster.yml are not supported.
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* `scale.yml` and `upgrade-cluster.yml` are not supported on clusters using CRI-O.
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helm and other feature may not be supported due to docker dependency.
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_To use CRI-O instead of Docker, set the following variables:_
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Use cri-o instead of docker, set following variable:
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#### all.yml
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#### all.yml
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```
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```yaml
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download_container: false
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download_container: false
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skip_downloads: false
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skip_downloads: false
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```
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```
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#### k8s-cluster.yml
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#### k8s-cluster.yml
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```
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```yaml
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etcd_deployment_type: host
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etcd_deployment_type: host
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kubelet_deployment_type: host
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kubelet_deployment_type: host
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container_manager: crio
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container_manager: crio
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```
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```
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[CRI-O]: https://cri-o.io/
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