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kubernetesrancherrke

how do I enable mount propagation in Rancher - Kubernetes feature gates?

How can I enable feature gates for my cluster in Rancher 2.0? I am in need of enabling the --feature-gates MountPropagation=true. This will enable me to use storage solutions like StorageOS, CephFS, etc

There are 2 use cases here :

  1. If the Rancher is setup already and running?
  2. If I am setting up the cluster from scratch?
Solution

  • Hello and hope this helps someone, After much googling and help from awesome people at Rancher I got the solution for this. Here is what you can do to set the feature gates flags for the Kubernetes engine RKE.

    step 1: Open Rancher2.0 UI

    step 2: View cluster in API

    enter image description here

    step 3: Click edit and modify the rancherKubernetesEngineConfig input box

    enter image description here

    • Find the services key.

    • Then add extra args for kubelet in below format

      "services": {
"etcd": { "type": "/v3/schemas/etcdService" },
"kubeApi": {
    "podSecurityPolicy": false,
    "type": "/v3/schemas/kubeAPIService",
    "extraArgs": { "feature-gates": "PersistentLocalVolumes=true, VolumeScheduling=true,MountPropagation=true" }
},
"kubeController": { "type": "/v3/schemas/kubeControllerService" },
"kubelet": {
    "failSwapOn": false,
    "type": "/v3/schemas/kubeletService",
    "extraArgs": { "feature-gates": "PersistentLocalVolumes=true, VolumeScheduling=true,MountPropagation=true" }
}

    step 4: Click show request .. you get a curl command and json request.

    step 5: Verify the request body data which will be shown.

    step 6: Make sure the key's which are not applicable are set to null. e.g amazonElasticContainerServiceConfig, azureKubernetesServiceConfig, googleKubernetesEngineConfig all need to null for me.

    step 7: Click send request

    You should get a response with status code 201. And your cluster will start updating. You can verify that your cluster RKE has updated by viewing the Cluster in API again.