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Update csi-config.md

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Sheng Yang 2019-03-26 18:23:07 -07:00 committed by GitHub
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@ -7,7 +7,7 @@
## Instruction ## Instruction
### For Kubernetes v1.11 only ### For RancherOS/CoreOS + Kubernetes v1.11 only
The following step is not needed for Kubernetes v1.12+. The following step is not needed for Kubernetes v1.12+.
Add extra_binds for kubelet in RKE `cluster.yml`: Add extra_binds for kubelet in RKE `cluster.yml`:
@ -59,12 +59,12 @@
### Common issues ### Common issues
#### Failed to get arg root-dir: Cannot get kubelet root dir, no related proc for root-dir detection ... #### Failed to get arg root-dir: Cannot get kubelet root dir, no related proc for root-dir detection ...
This error is due to Longhorn cannot find out where is the root dir setup for Kubelet, so the CSI plugin installation would fail. This error is due to Longhorn cannot find out where is the root dir setup for Kubelet, so the CSI plugin installation failed.
User can override the root-dir detection by manually setting argument `kubelet-root-dir` here: User can override the root-dir detection by manually setting argument `kubelet-root-dir` here:
https://github.com/rancher/longhorn/blob/master/deploy/longhorn.yaml#L329 https://github.com/rancher/longhorn/blob/master/deploy/longhorn.yaml#L329
**How to find `root-dir`?** #### How to find `root-dir`?
**For RancherOS/CoreOS** **For RancherOS/CoreOS**
@ -75,7 +75,7 @@ e.g.
$ ps aux | grep kubelet $ ps aux | grep kubelet
root 3755 4.4 2.9 744404 120020 ? Ssl 00:45 0:02 kubelet --root-dir=/opt/rke/var/lib/kubelet --volume-plugin-dir=/var/lib/kubelet/volumeplugins root 3755 4.4 2.9 744404 120020 ? Ssl 00:45 0:02 kubelet --root-dir=/opt/rke/var/lib/kubelet --volume-plugin-dir=/var/lib/kubelet/volumeplugins
``` ```
You will find `root-dir` in the cmdline of proc `kubelet`. By default it is `/opt/rke/var/lil/kubelet` if you are using RKE. You will find `root-dir` in the cmdline of proc `kubelet`. If it's not set, the default value `/var/lib/kubelet` would be used. In the case of RancherOS/CoreOS, the root-dir would be `/opt/rke/var/lib/kubelet` as shown above.
**For K3S** **For K3S**
@ -87,7 +87,7 @@ $ ps uax | grep k3s
root 4160 0.0 0.0 51420 3948 pts/0 S+ 00:55 0:00 sudo /usr/local/bin/k3s server --data-dir /opt/test/kubelet root 4160 0.0 0.0 51420 3948 pts/0 S+ 00:55 0:00 sudo /usr/local/bin/k3s server --data-dir /opt/test/kubelet
root 4161 49.0 4.0 259204 164292 pts/0 Sl+ 00:55 0:04 /usr/local/bin/k3s server --data-dir /opt/test/kubelet root 4161 49.0 4.0 259204 164292 pts/0 Sl+ 00:55 0:04 /usr/local/bin/k3s server --data-dir /opt/test/kubelet
``` ```
You will find `data-dir` in the cmdline of proc `k3s`. By default it is not set and `/var/lib/rancher/k3s` will be used. Then joining `data-dir` with `/agent/kubelet` you will get the `root-dir`. So the default `root-dir` is `/var/lib/rancher/k3s/agent/kubelet`. You will find `data-dir` in the cmdline of proc `k3s`. By default it is not set and `/var/lib/rancher/k3s` will be used. Then joining `data-dir` with `/agent/kubelet` you will get the `root-dir`. So the default `root-dir` for K3S is `/var/lib/rancher/k3s/agent/kubelet`.
## Background ## Background
@ -116,4 +116,4 @@ CSI doesn't work with RancherOS/CoreOS + RKE before Longhorn v0.4.1. The reason
## Reference ## Reference
https://github.com/kubernetes-csi/driver-registrar https://github.com/kubernetes-csi/driver-registrar
https://coreos.com/os/docs/latest/iscsi.html https://coreos.com/os/docs/latest/iscsi.html