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A Cloud Guru

Automate Kubernetes Image Vulnerability Scanning

Container image vulnerabilities can be a major attack vector for your Kubernetes infrastructure. In this lab, you will implement automated image scanning to ensure that severely vulnerable images do not run in your cluster.

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Path Info

Level

Advanced

Duration

30m

Published

Jun 04, 2021

Challenge

Configure the Admission Controller
You will find a skeleton admission control configuration at /etc/kubernetes/admission-control/admission-control.conf. Configure the admission controller by adding the necessary configuration to this file.

When configuring the admission controller:
- The kubeconfig is located at /etc/kubernetes/admission-control/imagepolicy_backend.kubeconfig.
- Configure the admission controller to deny workload creation by default, even if the backend webhook cannot be reached.
Challenge

Edit the Admission Controller's kubeconfig to Point to the Backend Webhook

Modify the admission controller's kubeconfig to point to the backend service.

The kubeconfig is located at /etc/kubernetes/admission-control/imagepolicy_backend.kubeconfig.

The backend service can be reached at acg.trivy.k8s.webhook:8090/scan.

Certificates are already set up in the kubeconfig, and the API server is already set up to be able to locate these certificate files.
Challenge

Enable Any Necessary Admission Control Plugins

Configure the API server to enable any necessary admission control plugins.

Once this is done, the API server should be using the backend webhook to scan images and deny workloads that have major vulnerabilities.

You can find Pod manifest files in /home/cloud_user you can use to test your setup. The Pod defined in good-pod.yml should succeed, while the Pod in bad-pod.yml should fail to be created due to image vulnerabilities.

Author

A Cloud Guru

The Cloud Content team comprises subject matter experts hyper focused on services offered by the leading cloud vendors (AWS, GCP, and Azure), as well as cloud-related technologies such as Linux and DevOps. The team is thrilled to share their knowledge to help you build modern tech solutions from the ground up, secure and optimize your environments, and so much more!

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