unable to view docker images on google kubernetes node v1.21.4-gke.2300

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I created a new kubernetes cluster (GKE) and installed an application using helm.

I was able to locate the gke-node on which my pod was deployed using the command, kubectl get pod -n namespace -o wide

Post that i logged on to the kubernetes-node, however on this node i am unable to view the docker images. This is the case on v1.21.4-gke.2300

In the older-version v1.19.13-gke.1200, i was able to observe the docker-images on nodes when they were pulled from repository

I can view the list of docker-images on v1.21.4-gke.2300 with the command kubectl get pods -n geo-test -o jsonpath="{.items[*].spec.containers[*].image}" | tr -s '[[:space:]]' '\n' | sort | uniq -c

But i would like to know where in the cluster are these images getting stored and why i am not able to observe them in the node like i did in the older version

My reason for asking is, because in version v1.19.13-gke.1200, i was able to perform minor changes in the docker-image, build a custom-image and use that for installation instead of storing the images in the gcr and pulling it from there Any suggestion on how to go about it in the new

v1.19.13-gke.1200

google-kubernetes-engine kubernetes docker
2 Answers

Starting with GKE node version 1.19, the default node image for Linux nodes is the Container-Optimized OS with containerd (cos_containerd) variant instead of the Container-Optimized OS with Docker (cos) variant.

Now instead of docker commands you can use crictl. Refer to the crictl user guide for the complete set of supported features and usage information.

Specifically, you can run crictl images to list the images, available on the node.

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In addition to the information already given to you, here is a set of commands using crictl. Here you can see the images command, which is to list the images in your container.

crictl  [global options] command [command options] [arguments...]

COMMANDS:

attach: Attach to a running container

create: Create a new container

exec: Run a command in a running container

version: Display runtime version information

images, image, img: List images

inspect: Display the status of one or more containers

inspecti: Return the status of one or more images

imagefsinfo: Return image filesystem info

inspectp: Display the status of one or more pods

logs: Fetch the logs of a container

port-forward: Forward local port to a pod

ps: List containers

pull: Pull an image from a registry

run: Run a new container inside a sandbox

runp: Run a new pod

rm: Remove one or more containers

rmi: Remove one or more images

rmp: Remove one or more pods

pods: List pods

start: Start one or more created containers

info: Display information of the container runtime

stop: Stop one or more running containers

stopp: Stop one or more running pods

update: Update one or more running containers

config: Get and set crictl client configuration options

stats: List container(s) resource usage statistics

completion: Output bash shell completion code

help, h: Shows a list of commands or help for one command

Here is a link to the complete command list

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