kubectl get all deployments with specific image tag - kubectl

Question

I have a question. how to find all deployments in cluster with specific tag image.
I want something like that:
kubectl get deployment -A -o jsonpath='{range .items[*]}{.spec.template.spec.containers[*].image}{"\n"}{end}'
But with deployments names and with specific image tags.

Answer 1

I don't have a cluster available to try this.
You don't want to range but filter and I think (!?) you won't be able to use kubectl's JSONPath to:
filter only ${TAG} from image: ${REPO}:${TAG} but you can filter by the value of a field e.g. ${REPO}:${TAG}
Return the deployments' metadata.name values
IIRC you can't nest filter, so you can't item[?(#.spec.template.spec.containers[?(#.image=\"${IMAGE}\")].metadata.name
You can enumerate same-level fields e.g. container.name if that helps. I haven't tried this but:
IMAGE="..."
FILTER="{
.items[*].spec.template.spec.containers[?(#.image==\"${IMAGE}\")].name
}"
kubectl \
get deployments \
--all-namespaces \
--output=jsonpath="${FILTER}"
This may be better done with a tool like jq:
IMAGE="..."
FILTER="
.items[]|
select(.spec.template.spec.containers[].image==\"${IMAGE}\")
.metadata.name
"
kubectl \
get deployments \
--all-namespaces \
--output=json \
| jq -r "${FILTER}"
NOTE Using jq you can filter by ${TAG} too. I'll leave that exercise to you.