EKS kubelet snap
================

EKS worker nodes run kubelet from the `kubelet-eks snap`_. The snap 
channel is set based on the Kubernetes version corresponding to the EKS worker node image. For
Kubernetes version `X.Y` the channel is set to `X.Y.P/stable` where `P` is the latest kubelet `X.Y`
patch version supported by the image. For example, the latest supported version of kubelet is 1.28.2
for Kubernetes 1.28, as of this writing (23 Jan 2024). Therefore, the channel of the ``kubelet-eks`` snap
in the latest image corresponding to the Kubernetes version is set to `1.28.2/stable`.

Note that the `latest` channel track of the snap is unused.

See the `official snap documentation <https://snapcraft.io/docs/channels>`_ for more information
about the concept of channels and tracks.

Automatic snap updates
~~~~~~~~~~~~~~~~~~~~~~

In EKS worker node images, automatic background updates of ``kubelet-eks``, ``aws-cli``, and
**all** other installed snaps are disabled. To enable automatic background updates of **all**
installed snaps run the following command in the worker node:

.. code::

    sudo snap refresh --unhold

To enable automatic background updates of only the ``kubelet-eks`` snap, run the following command in
the worker node:

.. code::

    sudo snap refresh --unhold kubelet-eks

Updates of ``kubelet-eks`` snap shouldn't affect running workloads, but Kubernetes API access for the
node is expected to be unavailable for up to 30 seconds.

.. _`kubelet-eks snap`: https://snapcraft.io/kubelet-eks