Skip to main content
Version: 2.0.x

Fetching Cluster Images

It can be difficult to know exactly what images are actively running in your environment. Below is a simple way to generate a list of every image in a running cluster, store it as an environment variable, and turn that list into a Hauler manifest you can sync into your store.

Capturing your cluster's images as a manifest makes the set reproducible: you can version-control it, review changes over time, and re-sync the exact same content on demand - so rebuilding a haul or standing up the cluster again in a disconnected environment is repeatable rather than a manual scramble.

Fetch Cluster Images​

# fetch all images in the cluster, remove duplicates, alphabetize, and put on a newline
export IMAGE_LIST=$({
  kubectl get pods --all-namespaces -o jsonpath="{range .items[*]}{.spec.containers[*].image} {.spec.initContainers[*].image} {.spec.ephemeralContainers[*].image}{'\n'}{end}"
  kubectl get cronjobs --all-namespaces -o jsonpath="{range .items[*]}{.spec.jobTemplate.spec.template.spec.containers[*].image} {.spec.jobTemplate.spec.template.spec.initContainers[*].image}{'\n'}{end}"
} | tr ' ' '\n' | sort -u | sed '/^$/d')

Example Output​

# view the list of images from the cluster
echo $IMAGE_LIST
index.docker.io/rancher/hardened-etcd:v3.5.1-k3s1-build20220112
index.docker.io/rancher/hardened-kubernetes:v1.23.5-rke2r1-build20220316
index.docker.io/rancher/rke2-cloud-provider:v0.0.3-build20211118
rancher/hardened-calico:v3.21.4-build20220228
rancher/hardened-cluster-autoscaler:v1.8.5-build20211119
rancher/hardened-coredns:v1.9.1-build20220318
rancher/hardened-flannel:v0.17.0-build20220317
rancher/hardened-k8s-metrics-server:v0.5.0-build20211119
rancher/klipper-helm:v0.7.0-build20220315
rancher/nginx-ingress-controller:nginx-1.0.2-hardened4

Generate Hauler Manifest​

# add the required formatting for the image list
export IMAGE_LIST_MODIFIED=$(echo "${IMAGE_LIST}" | sed 's/^/    - name: /')

# create the hauler manifest with the updated image list
cat << EOF >> hauler-manifest.yaml
apiVersion: content.hauler.cattle.io/v1
kind: Images
metadata:
  name: hauler-cluster-images
spec:
  images:
$IMAGE_LIST_MODIFIED
EOF

Resulting Hauler Manifest​

hauler-manifest.yaml
apiVersion: content.hauler.cattle.io/v1
kind: Images
metadata:
  name: hauler-cluster-images
spec:
  images:
    - name: index.docker.io/rancher/hardened-etcd:v3.5.1-k3s1-build20220112
    - name: index.docker.io/rancher/hardened-kubernetes:v1.23.5-rke2r1-build20220316
    - name: index.docker.io/rancher/rke2-cloud-provider:v0.0.3-build20211118
    - name: rancher/hardened-calico:v3.21.4-build20220228
    - name: rancher/hardened-cluster-autoscaler:v1.8.5-build20211119
    - name: rancher/hardened-coredns:v1.9.1-build20220318
    - name: rancher/hardened-flannel:v0.17.0-build20220317
    - name: rancher/hardened-k8s-metrics-server:v0.5.0-build20211119
    - name: rancher/klipper-helm:v0.7.0-build20220315
    - name: rancher/nginx-ingress-controller:nginx-1.0.2-hardened4

Sync the Manifest​

With the manifest generated, sync its images into your store with hauler store sync:

hauler store sync --filename hauler-manifest.yaml