kubelet
========
###### tags: `k8s`

:::info
An ==agent== that runs on each node in the cluster. ***It makes sure that containers are running in a Pod.***
:::

+ The kubelet takes a set of PodSpecs that are provided through various mechanisms and ensures that the ==containers== described in those PodSpecs are ***running and healthy***.
+ The kubelet doesn't manage containers which were not created by Kubernetes.


## cri-tools
> from kubernetes community

cri-tools aims to provide a series of ***debugging and validation tools*** for Kubelet CRI, which includes:
+ <kbd>crictl</kbd>: CLI for kubelet CRI.
+ <kbd>critest</kbd>: validation test suites for kubelet CRI.

### useful commands

crictl pull busybox
crictl images
crictl ps
crictl exec -ti busybox sh
crictl pods

## trouble shooting

systemctl status kubelet
journalctl -u kubelet -f