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Add instruction on how to find out if host supports MountPropagation.
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Sheng Yang 2018-08-09 17:14:42 -07:00 committed by GitHub
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@ -39,6 +39,24 @@ Longhorn can be used in Kubernetes to provide persistent storage through either
1. It's enabled by default in Kubernetes v1.10. But some early versions of RKE may not enable it.
3. If above conditions cannot be met, Longhorn will falls back to use Flexvolume driver.
### Check if your setup satisfied CSI requirement
1. Use the following command to check your Kubernetes server version
```
> kubectl version
Client Version: version.Info{Major:"1", Minor:"10", GitVersion:"v1.10.3", GitCommit:"2bba0127d85d5a46ab4b778548be28623b32d0b0", GitTreeState:"clean", BuildDate:"2018-05-21T09:17:39Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"10", GitVersion:"v1.10.1", GitCommit:"d4ab47518836c750f9949b9e0d387f20fb92260b", GitTreeState:"clean", BuildDate:"2018-04-12T14:14:26Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"linux/amd64"}
```
The `Server Version` should be `v1.10` or above.
2. Use the following command on the hosts to check if the feature gate is enabled for Mount Propagation
```
> ps aux|grep kube|grep MountPropagation
root 1707 3.1 12.4 1087008 503848 ? Ssl Jul12 1288:35 kube-apiserver --storage-backend=etcd3 --client-ca-file=/etc/kubernetes/ssl/kube-ca.pem --tls-cert-file=/etc/kubernetes/ssl/kube-apiserver.pem --kubelet-client-certificate=/etc/kubernetes/ssl/kube-apiserver.pem --apiserver-count=1 --secure-port=6443 --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname --kubelet-client-key=/etc/kubernetes/ssl/kube-apiserver-key.pem --tls-cipher-suites=TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305 --allow-privileged=true --insecure-port=0 --admission-control=ServiceAccount,NamespaceLifecycle,LimitRanger,PersistentVolumeLabel,DefaultStorageClass,ResourceQuota,DefaultTolerationSeconds --cloud-provider= --service-cluster-ip-range=10.43.0.0/16 --tls-private-key-file=/etc/kubernetes/ssl/kube-apiserver-key.pem --service-account-key-file=/etc/kubernetes/ssl/kube-apiserver-key.pem --authorization-mode=Node,RBAC --bind-address=0.0.0.0 --feature-gates=MountPropagation=true --insecure-bind-address=127.0.0.1 --etcd-cafile=/etc/kubernetes/ssl/kube-ca.pem --etcd-certfile=/etc/kubernetes/ssl/kube-node.pem --etcd-keyfile=/etc/kubernetes/ssl/kube-node-key.pem --etcd-servers=https://138.197.199.191:2379 --etcd-prefix=/registry
root 1760 4.7 6.4 1508564 260724 ? Ssl Jul12 1970:59 kubelet --network-plugin=cni --resolv-conf=/etc/resolv.conf --cluster-domain=cluster.local --v=2 --enforce-node-allocatable= --cgroups-per-qos=True --cni-bin-dir=/opt/cni/bin --cluster-dns=10.43.0.10 --cloud-provider= --fail-swap-on=false --address=0.0.0.0 --cadvisor-port=0 --volume-plugin-dir=/var/lib/kubelet/volumeplugins --hostname-override=yasker-longhorn-dev-1 --client-ca-file=/etc/kubernetes/ssl/kube-ca.pem --root-dir=/var/lib/kubelet --tls-cipher-suites=TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305 --feature-gates=MountPropagation=true --cni-conf-dir=/etc/cni/net.d --allow-privileged=true --pod-infra-container-image=rancher/pause-amd64:3.0 --kubeconfig=/etc/kubernetes/ssl/kubecfg-kube-node.yaml --read-only-port=0 --anonymous-auth=false --cgroup-driver=cgroupfs
```
Both `kube-apiserver` and `kubelet` should have `--feature-gates=MountPropagation=true`
### Requirement for the Flexvolume driver
1. Kubernetes v1.8+