How to add flag to kubelet

Question

I want to deploy rook for kubernetes. I use 1 master and 3 worker and the host is ubuntu in baremetal. but the container stuck in creating container. after a lot of search i und

Answer 1

There are two options.

I. set

KUBELET_EXTRA_ARGS=--FLEXVOLUME_DIR_PATH=/var/lib/kubelet/volumeplugins

within the file

/etc/default/kubelet

And restart kubelete service

sudo systemctl restart kubelet

II. You can set kubelet parameters via a config file.

For example:

kind: KubeletConfiguration
apiVersion: kubelet.config.k8s.io/v1beta1
env:
- name: FLEXVOLUME_DIR_PATH
  value: "/var/lib/kubelet/volumeplugins"

Then, you just start the Kubelet with the --config flag set to the path of the Kubelet’s config file

sudo kubelet --config=/etc/default/kubelet/custom-conf.config

https://kubernetes.io/docs/tasks/administer-cluster/kubelet-config-file/

Answer 2

@yasin lachini,
If you deploy kubernetes cluster on baremetal, you don't need to configure anything. That is because /usr/libexec/kubernetes/kubelet-plugins/volume/exec/ is the kubelet default FlexVolume path and Rook assumes the default FlexVolume path if not set differently.

My env:
rook-ceph/operator.yml (use default FLEXVOLUME_DIR_PATH) :

...
        # Set the path where the Rook agent can find the flex volumes
        # - name: FLEXVOLUME_DIR_PATH
        #   value: "/usr/libexec/kubernetes/kubelet-plugins/volume/exec"
...

After deploy,on node:

# ls /usr/libexec/kubernetes/kubelet-plugins/volume/exec/
ceph.rook.io~rook  ceph.rook.io~rook-ceph-system  rook.io~rook  rook.io~rook-ceph-system