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snyk/kubernetes-monitor

Summary

Container to monitor Kubernetes clusters' security

Prerequisites

  • 50 GiB of storage in the form of emptyDir.
  • External internet access from the Kubernetes cluster, specifically to kubernetes-upstream.snyk.io.
  • 1 CPU, 2 GiB RAM
  • 1 Kubernetes worker node of type linux/amd64 - supported and tested only on the AMD64 CPU architecture

Supported Kubernetes distributions:

  • Any Kubernetes Certified distribution, for example: GKE, AKS, EKS, OCP.
  • OCP 4.1+ if running on OpenShift - supported and tested on Generally Available versions

Tested with the following Security Context Constraint on OCP.

Installing

The Snyk monitor (kubernetes-monitor) requires some minimal configuration items in order to work correctly.

As with any Kubernetes deployment, the kubernetes-monitor runs within a single namespace. If you do not already have access to a namespace where you want to deploy the monitor, you can run the following command to create one:

kubectl create namespace snyk-monitor

Notice our namespace is called snyk-monitor and it is used for the following commands in scoping the resources.

The Snyk monitor relies on using your Snyk Integration ID, which must be provided from a Kubernetes secret. The secret must be called snyk-monitor. The steps to create the secret are as such:

  1. Locate your Snyk Integration ID from the Snyk Integrations page (navigate to https://app.snyk.io/org/YOUR-ORGANIZATION-NAME/manage/integrations/kubernetes) and copy it. The Snyk Integration ID is a UUID and looks similar to the following:
abcd1234-abcd-1234-abcd-1234abcd1234

The Snyk Integration ID is used in the --from-literal=integrationId= parameter in the next step.

  1. If you are not using any private registries, create a Kubernetes secret called snyk-monitor containing the Snyk Integration ID from the previous step running the following command:
kubectl create secret generic snyk-monitor -n snyk-monitor --from-literal=dockercfg.json={} --from-literal=integrationId=abcd1234-abcd-1234-abcd-1234abcd1234

Continue to YAML files installation instructions below.

  1. If you're using a private registry, you should create a dockercfg.json file. The dockercfg.json file is necessary to allow the monitor to look up images in private registries. Usually your credentials can be found in $HOME/.docker/config.json. These must also be added to the dockercfg.json file.

Create a file named dockercfg.json. Store your credentials in there; it should look like this:

{
  // If your cluster does not run on GKE or it runs on GKE and pulls images from other private registries, add the following:
  "auths": {
    "gcr.io": {
      "auth": "BASE64-ENCODED-AUTH-DETAILS"
    }
    // Add other registries as necessary
  },
  
  // If your cluster runs on GKE and you are using GCR, add the following:
  "credHelpers": {
    "us.gcr.io": "gcloud",
    "asia.gcr.io": "gcloud",
    "marketplace.gcr.io": "gcloud",
    "gcr.io": "gcloud",
    "eu.gcr.io": "gcloud",
    "staging-k8s.gcr.io": "gcloud"
  }
}

Finally, create the secret in Kubernetes by running the following command:

kubectl create secret generic snyk-monitor -n snyk-monitor --from-file=./dockercfg.json --from-literal=integrationId=abcd1234-abcd-1234-abcd-1234abcd1234
  1. If your private registry requires installing certificates (*.crt, *.cert, *.key only) please put them in a folder and create the following ConfigMap:
kubectl create configmap snyk-monitor-certs -n snyk-monitor --from-file=<path_to_certs_folder>
  1. If you are using an insecure registry or your registry is using unqualified images, you can provide a registries.conf file. See the documentation for information on the format and examples.

Create a file named registries.conf, see example adding an insecure registry:

[[registry]]
location = "internal-registry-for-example.net/bar"
insecure = true

Once you've created the file, you can use it to create the following ConfigMap:

kubectl create configmap snyk-monitor-registries-conf -n snyk-monitor --from-file=<path_to_registries_conf_file>

Installation from YAML files

The kubernetes-monitor can run in one of two modes: constrained to a single namespace, or with access to the whole cluster. In other words, the monitor can scan containers in one particular namespace, or it can scan all containers in your cluster. The choice of which deployment to use depends on the permissions you have on your cluster.

For cluster-scoped deployment you can create the necessary ServiceAccount, ClusterRole, and ClusterRoleBinding required for the monitor's deployment. These objects ensure the monitor has the right (limited) level of access to resources in the cluster. The command is as follows:

kubectl apply -f snyk-monitor-cluster-permissions.yaml

Note that even though the monitor operates in the whole cluster, the ClusterRole ensures it can only read or watch resources; the monitor can never modify your objects!

For a namespaced deployment you can create the necessary ServiceAccount, Role, and RoleBinding required for the monitor's deployment:

kubectl apply -f snyk-monitor-namespaced-permissions.yaml

Similarly to the cluster-scoped deployment, this Role ensures the monitor can only read or watch resources, never to modify them!

By default, the Snyk monitor sends workload information to Snyk using a default cluster name. To change the cluster name, you can modify snyk-monitor-namespaced-permissions.yaml (for the Namespaced deployment) or snyk-monitor-cluster-permissions.yaml (for the Cluster-scoped deployment) and set the string value of clusterName to the name of your cluster. You will now see your workloads appearing in Snyk under the new cluster name.

Finally, to launch the Snyk monitor in your cluster, run the following:

kubectl apply -f snyk-monitor-deployment.yaml

Upgrades

You can apply the latest version of the YAML installation files to upgrade.

If running with Operator Lifecycle Manager (OLM) then OLM will handle upgrades for you when you request to install the latest version. This applies to OpenShift (OCP) and regular installations of OLM.

Setting up proxying

Proxying traffic through a forwarding proxy can be achieved by modifying the snyk-monitor-cluster-permissions.yaml or snyk-monitor-namespaced-permissions.yaml (depending on which one was applied) and setting the following variables in the ConfigMap:

  • http_proxy
  • https_proxy
  • no_proxy

For example:

apiVersion: v1
kind: ConfigMap
metadata:
  ...
data:
  ...
  https_proxy: "http://192.168.99.100:8080"

The snyk-monitor currently works with HTTP proxies only.

Note that snyk-monitor does not proxy requests to the Kubernetes API server.

Note that snyk-monitor does not support wildcards or CIDR addresses in no_proxy -- it will only look for exact matches. For example:

# not OK:
no_proxy: *.example.local,*.other.global,192.168.0.0/16

# OK:
no_proxy: long.domain.name.local,example.local

Changing log level

To lower snyk-monitor's logging verbosity log_level value could be set to one of these options:

  • 'WARN'
  • 'ERROR'

By default, log_level is 'INFO'.

Using a PVC

By default, snyk-monitor uses an emptyDir for temporary storage. If you prefer to have a PVC that uses a statically or dynamically provisioned PV that you have created, then set the following value

  • pvc.enabled true

The PVC's name defaults to snyk-monitor-pvc. If you prefer to override this, then use the following value:

  • pvc.name

Terms and conditions

The Snyk Container Kubernetes integration uses Red Hat UBI (Universal Base Image).

Before downloading or using this application, you must agree to the Red Hat subscription agreement located at redhat.com/licenses. If you do not agree with these terms, do not download or use the application. If you have an existing Red Hat Enterprise Agreement (or other negotiated agreement with Red Hat) with terms that govern subscription services associated with Containers, then your existing agreement will control.