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Update csi-config.md

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Sheng Yang 2019-03-26 18:24:46 -07:00 committed by GitHub
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@ -53,13 +53,13 @@
``` ```
#### K3S: #### K3S:
No extra configuration is needed. No extra configuration is needed as long as you have `open-iscsi` or `iscsiadm` installed on the node.
## Troubleshooting ## Troubleshooting
### 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 failed. This error is due to Longhorn cannot detect 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
@ -77,6 +77,8 @@ root 3755 4.4 2.9 744404 120020 ? Ssl 00:45 0:02 kubelet --root-
``` ```
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. 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.
If kubelet is using a configuration file, you would need to check the configuration file to locate the `root-dir` parameter.
**For K3S** **For K3S**
Run `ps aux | grep k3s` and get argument `--data-dir` or `-d` on k3s node. Run `ps aux | grep k3s` and get argument `--data-dir` or `-d` on k3s node.
@ -89,6 +91,7 @@ root 4161 49.0 4.0 259204 164292 pts/0 Sl+ 00:55 0:04 /usr/local/bin/
``` ```
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`. 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`.
If K3S is using a configuration file, you would need to check the configuration file to locate the `data-dir` parameter.
## Background ## Background
CSI doesn't work with RancherOS/CoreOS + RKE before Longhorn v0.4.1. The reason is: CSI doesn't work with RancherOS/CoreOS + RKE before Longhorn v0.4.1. The reason is: