Kubernetes Runtime Inventory

Overview

Using Anchore’s runtime inventory agents provides Anchore Enterprise access to what images are being used in your deployments. This can help give insight into where vulnerabilities or policy violations are in your production workloads.

Anchore uses a go binary called anchore-k8s-inventory that leverages the Kubernetes Go SDK to reach out and list containers in a configurable set of namespaces to determine which images are running.

anchore-k8s-inventory can be deployed via its helm chart, embedded within your Kubernetes cluster as an agent. It will require access to the Anchore API.

General Runtime Configuration

Getting Started

The most common way to track inventory is to install anchore-k8s-inventory as an agent in your cluster. To do this you will need to configure credentials and information about your deployment in the values file. It is recommended to first configure a specific robot user for the account where you’ll want to track your Kubernetes inventory.

As an agent anchore-k8s-inventory is installed using helm and the helm chart is hosted as part of the https://charts.anchore.io repo. It is based on the anchore/k8s-inventory docker image.

To install the helm chart, follow these steps:

1. Configure your username, password, Anchore account, Anchore URL and cluster name in the values file.

k8sInventory:
  # Path should not be changed, cluster value is used to tell Anchore which cluster this inventory is coming from
  kubeconfig:
    cluster: <unique-name-for-your-cluster>

  anchoreRegistration:
    #RegistrationId: ""
    IntegrationName: "<unique-name-for-your-cluster>"
    IntegrationDescription: ""

  anchore:
    url: <URL for your>

    # Note: recommend using the inventory-agent role
    user: <user>
    password: <password>
    account: <account>

2. Run helm install in the cluster(s) you wish to track

$ helm repo add anchore https://charts.anchore.io
$ helm install <release> -f <values.yaml> anchore/k8s-inventory

anchore-k8s-inventory must be able to resolve the Anchore URL and requires API credentials. Review the anchore-k8s-inventory logs if you are not able to see the inventory results in the UI.

Note: the Anchore API Password can be provided via a Kubernetes secret, or injected into the environment of the anchore-k8s-inventory container

• For injecting the environment variable, see: injectSecretsViaEnv
• For providing your own secret for the Anchore API Password, see: useExistingSecret. K8s Inventory creates it’s own secret based on your values.yaml file for key k8sInventory.anchore.password, but the k8sInventory.useExistingSecret key allows you to create your own secret and provide it in the values file. See the K8s Inventory repo for more information about the K8s Inventory specific configuration

Usage

To verify that you are tracking Kubernetes Inventory you can access inventory results with the command anchorectl inventory list and look for results where the TYPE is kubernetes.

The UI also displays the Kubernetes Inventory and allows operators to visually navigate the images, vulnerability results, and see the results of the policy evaluation.

For more details about watching clusters, and reviewing policy results see the Using Kubernetes Inventory section.

Inventory Time-To-Live

As part of reporting on your runtime environment, Anchore maintains an active record of the containers, the images they run, and other related metadata based on time they were last reported by an inventory agent.

The configuration setting below allow you to specify how long inventory should remain part of the Catalog Service’s working set. These are the default settings found in the values file.

services:
  catalog:
    runtime_inventory:
      inventory_ingest_overwrite: false
      inventory_ttl_days: 120

Below are a few examples on how you may want to use this feature.

Keep most recently reported inventory

inventory_ingest_overwrite: true
inventory_ttl_days: 7

For each cluster/namespace reported from the inventory agent, the system will delete any previously reported containers and images and replace it with the new inventory.

Note: The inventory_ttl_days is still needed to remove any cluster/namespaces that are no longer reported as well as some of the supporting metadata (ie. pods, nodes). This value should be configured to be long enough that inventory isn’t incorrectly removed in case of an outage from the reporting agent. The exact value depends on each deployment, but 7 days is a reasonable value here.

Keep inventory reported over a time period

inventory_ingest_overwrite: false
inventory_ttl_days: 14

This will delete any container and image that has not been reported by an agent in the last 14 days. This includes its supporting metadata (ie. pods, nodes).

Keep inventory indefinitely

inventory_ingest_overwrite: false
inventory_ttl_days: 0

This will keep any containers, images, and supporting metadata reported by an inventory agent indefinitely.

Deleting Inventory via API

Where it is not desirable to wait for the Image TTL to remove runtime inventory images it is possible to manually delete inventory items via the API by issuing a DELETE to /v2/inventories with the following query parameters.

• inventory_type (required) - either ecs or kubernetes
• context (required) - it must match a context as seen by the output of anchorectl inventory list
  • Kubernetes - this is a combination of cluster name (as defined by the anchore-k8s-inventory config) and a namespace containing running containers e.g. cluster1/default.
  • ECS - this is the cluster ARN e.g. arn:aws:ecs:eu-west-2:123456789012:cluster/myclustername
• image_digest (optional) - set if you only want to remove a specific image

e.g. DELETE /v2/inventories?inventory_type=<string>&context=<string>&image_digest=<string>

Using curl: curl -X DELETE -u username:password "http://{servername:port}/v2/inventories?inventory_type=&context=&image_digest=

Agents

Anchore provides agents for collecting the inventory of different container runtime environments:

• Kubernetes Runtime Inventory
• ECS Runtime Inventory