I have a DigitalOcean flexVolume on CoreOS. I am following this documentation for CoreOS from TonyZou.
Note that CoreOS mounts /usr as read-only so instead you'll want to add --volume-plugin-dir=/etc/kubernetes/volumeplugins to KUBELET_ARGS in /etc/kubernetes/kubelet.env and put the plugins there instead.
Restart kubelet with systemctl restart kubelet.service.
I create file in /etc/kubernetes/kubelet.env with content:
KUBELET_ARGS=--volume-plugin-dir=/etc/kubernetes/volumeplugins
And my driver in /etc/kubernetes/volumeplugins folder. However, the pod using the flexvolume driver keeps remaining in ContainerCreating status. Not sure if the kubelet.env file is getting picked up by kubelet. Any suggestions?
Your kubelet didn't pick up the kubelet.env.
If you wanna run the kubelet manually, you should add KUBELET_ARGS=--volume-plugin-dir=/etc/kubernetes/volumeplugins in your shell environment.
If you wanna run the kubelet by systemd, you should add the kubelet.env in your kubelet systemd config file and reload the config file.
You can maybe add the /etc/kubernetes/kubelet.env file to your kubelet systemd unit. Something like
EnvironmentFile=/etc/kubernetes/kubelet.env
This ensures that the kubelet service will pick up your env file.