Guides

Ensure that the --hostname-override argument is not set (Kubelet) (Openshift)

Do not override node hostnames.

Suggest Edits

Risk Level: Low
Cloud Entity: Node
CloudGuard Rule ID: D9.K8S.NET.32
Covered by Spectral: No
Category: Compute

GSL LOGIC

KubernetesNode should not have kubeletData.kubeletconfig.hostnameOverride

REMEDIATION

Edit the kubelet service file /etc/systemd/system/kubelet.service.d/10-kubeadm.conf
on each worker node and remove the --hostname-override argument from the
KUBELET_SYSTEM_PODS_ARGS variable.
Based on your system, restart the kubelet service. For example:
systemctl daemon-reload
systemctl restart kubelet.service

References

  1. https://docs.openshift.com/container-platform/4.5/architecture/control-plane.html#understanding-machine-config-operator_control-plane
  2. https://github.com/openshift/machine-config-operator/blob/release-4.5/templates/master/01-master-kubelet/_base/files/kubelet.yaml
  3. https://github.com/openshift/machine-config-operator/blob/release-4.5/templates/worker/01-worker-kubelet/_base/files/kubelet.yaml
  4. https://kubernetes.io/docs/reference/command-line-tools-reference/kubelet/
  5. https://github.com/kubernetes/kubernetes/issues/22063

Node

A node is a worker machine in Kubernetes, previously known as a minion. A node may be a VM or physical machine, depending on the cluster. Each node contains the services necessary to run pods and is managed by the master components. The services on a node include the container runtime, kubelet and kube-proxy.

Compliance Frameworks

  • CIS Amazon Elastic Kubernetes Service (EKS) Benchmark v1.0.1
  • CIS Amazon Elastic Kubernetes Service (EKS) Benchmark v1.1.0
  • CIS Amazon Elastic Kubernetes Service (EKS) Benchmark v1.2.0
  • CIS Amazon Elastic Kubernetes Service (EKS) Benchmark v1.3.0
  • CIS Google Kubernetes Engine (GKE) Benchmark v1.2.0
  • CIS Google Kubernetes Engine (GKE) Benchmark v1.4.0
  • CIS Kubernetes Benchmark v1.20
  • CIS Kubernetes Benchmark v1.23
  • CIS Kubernetes Benchmark v1.24
  • CIS Kubernetes Benchmark v1.4.0
  • CIS Kubernetes Benchmark v1.6.1
  • CIS Microsoft Kubernetes Engine (AKS) Benchmark v1.3.0
  • CIS OpenShift Container Platform v4 Benchmark v1.1.0
  • Kubernetes NIST.SP.800-190
  • Kubernetes v.1.13 CloudGuard Best Practices
  • Kubernetes v.1.14 CloudGuard Best Practices
  • OpenShift Container Platform v3

Updated about 1 year ago