[GKE] Can I apply the metadata "startup-script-url" to GKE instance when I create a Cluster?

[Shigeomi Takada]

Hi

I use GKE.

I set the metadata "startup-script-url" to apply my startup-script file as follows. 

{

  "cluster": {

    "name": "cluster1",

    "initialNodeCount": 3,

    "nodeConfig": {

      "metadata": {

        "startup-script-url": "https://storage.googleapis.com/my-bucket/my-startup-script "

      }

    }

  }

}

But my startup-script dose not work. When I create a GCE instance with the metadata "startup-script-url", I'm able to make it work. I think that I can apply a startup-script to GKE instances in the same way to apply a startup-script to GCE instances.

I referred to this site how to apply the startup-script to the instance.

https://cloud.google.com/compute/docs/startupscript

Cannot I apply the metadata "startup-script-url" to GKE instance on specifications?

Dose anyone have any idea?

Regards,

Shigeomi

[Robert Bailey]

Startup scripts are not allowed to be specified for GKE nodes. From https://cloud.google.com/container-engine/reference/rest/v1/NodeConfig:

Additionally, to avoid ambiguity, keys must not conflict with any other metadata keys for the project or be one of the four reserved keys: "instance-template", "kube-env", "startup-script", and "user-data"

Take a look at https://github.com/kubernetes/contrib/tree/master/startup-script for a way to replace the functionality of startup scripts with a daemonset. 

 

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