K
Q

Kubernetes change kubelet config at all cluster

5/12/2018

I need add argument --authentication-token-webhook in Kubelet. I can change file /etc/systemd/system/kubelet.service.d/10-kubeadm.conf at all nodes step by step with my hands. But it is not funny )). How can I change Kubelet arguments from single point?

-- Ivan
devops
kubelet
kubernetes

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1 Answer

5/12/2018

You can either

  1. configure your Kubernetes workers via tools like Puppet or Ansible. Write your service drop-in once and deploy it via the tool to all nodes. Make sure you don't restart all kubelets at once (keyword serial for Ansible). Also, don't change 10-kubeadm.conf, drop in another file like 20-kubeadm-extra-args.conf and set the environment variable KUBELET_EXTRA_ARGS.
  2. or use a Kubernetes feature called DynamicKubeletConfig. Beware that this is an alpha feature (as of Kubernetes 1.10) and has to be enabled by hand. I wouldn't recommend this method (yet, as long as it's an alpha feature), but it might become a feasible option in the future.
-- embik
Source: StackOverflow