k8s-sidecar | This is a docker container intended to run inside a kubernetes cluster to collect config maps with a

You are running Jenkins itself as a container. Therefore the docker command line application must be present in the container, not the host.

Easiest solution: Use a Jenkins docker image that contains the docker cli already, for example https://hub.docker.com/r/trion/jenkins-docker-client

You can use a different jsonpath to get all images:

kubectl get pods -A -o jsonpath="{..image}"

If you just want unique images: kubectl get pods -A -o jsonpath="{..image}" | tr -s '[[:space:]]' '\n' | sort -u.

Substituting -A for the namespace of your chart or manifests.

If you have the manifests on your machine and not deployed, of course, you can just grep: grep 'image: ' *.yml

You can also use Go template syntax:

kubectl get pods -A -o go-template --template="{{range .items}}{{range .spec.containers}}{{.image}} {{end}}{{end}}"

If you have more than one chart in a given namespace, I think grepping would be the best way: helm template some-chart | grep 'image:'

EDIT:

Since this will be running in CI, it would be better to use a little bit of code to avoid potential false positives. This Python script does the trick:

Firstly make sure that you had executed command:

Possible explanation.

Workaround, create your cluster with 1.15 version and it should work.

I would suggest few changes do it like this

1. Keep everything blank for jenkins tunnel. Jenkins will automatically will pick it up.

2. If you deployed this jenkins instance in kubernetes cluster then please use internal address for jenkins_url like http://jenkins.infrastructure.svc i assume your jenkins service name is jenkins and it is ClusterIP

I never used this sidecar - I manually setup replica, but I guess you are missing KUBERNETES_MONGO_SERVICE_NAME to use stable network IDs as mentioned in sidecar repository