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Merge pull request #1130 from kokhang/coreos-flexvolume-docs

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Adding documentation to configure flexvolume in coreos
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Jared Watts
2017-10-26 07:47:24 -07:00
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Documentation/k8s-pre-reqs.md
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@@ -22,6 +22,37 @@ Creating the Rook operator requires privileges for setting up RBAC. To launch th
-subj "/CN=admin/O=system:masters"
```
## Flexvolume Configuration
Rook uses [Flexvolume](https://github.com/kubernetes/community/blob/master/contributors/devel/flexvolume.md) to integrate with Kubernetes for performing storage operations. In some operating systems where Kubernetes is deployed, the [default Flexvolume plugin directory](https://github.com/kubernetes/community/blob/master/contributors/devel/flexvolume.md#prerequisites) (the directory where flexvolume drivers are installed) is **read-only**.
This is the case for Kubernetes deployments on CoreOS and Rancher.
In these environments, the Kubelet needs to be told to use a different flexvolume plugin directory that is accessible and writeable.
To do this, you will need to first add the `--volume-plugin-dir` flag to the Kubelet and then restart the Kubelet process.
These steps need to be carried out on **all nodes** in your cluster.
### CoreOS Container Linux
In CoreOS, our recomendation is to specify the flag as shown below:
```bash
--volume-plugin-dir=/var/lib/kubelet/volumeplugins
```
Restart Kubelet in order for this change to take effect.
### Rancher
Rancher provides an easy way to configure Kubelet. This flag can be provided to the Kubelet configuration template at deployment time or by using the `up to date` feature if Kubernetes is already deployed.
To configure Flexvolume in Rancher, specify this Kubelet flag as shown below:
```bash
--volume-plugin-dir=/var/lib/kubelet/volumeplugins
```
Restart Kubelet in order for this change to take effect.
## Minikube
To install `minikube`, refer to this [page](https://github.com/kubernetes/minikube/releases). Once you have `minikube` installed, start a cluster by doing the following: