Kubernetes

This pack defines the properties that will be used by Spectro Cloud to bring up the Kubernetes cluster. Most of the Kubernetes hardening standards recommended by the Center for Internet Security is enabled by default.

Info: Only Kubernetes versions 1.16 and above is supported

Supported Kubernetes versions

Versions supported in the latest release are highlighted.

1.16.x

1.17.x

1.18.x

1.19.x

1.20.x

1.21.x

1.16.15
1.16.14
1.16.13
1.16.8
1.16.7
1.16.4
1.16.3

Notable parameters

Name	Supported values	Default value	Description
pack.k8sHardening	True, False	True	Flag to decide if Kubernetes hardening should be applied.
			When set to True, additional flags configured in `kubeadmconfig` will be honored and will be set to the corresponding components.
			When set to True, additional flags configured in kubeadmconfig will be honored and will be set to the corresponding components.
pack.podCIDR	`192.168.0.0/16`	CIDR range for the pod networking. This should match the networking layer property `calicoNetworkCIDR`.	CIDR range for Pods in cluster
pack.serviceClusterIpRange	`10.96.0.0/12`	CIDR range for the services. This should not overlap with any IP ranges assigned to nodes for pods.	CIDR range for Services in the Cluster
kubeadmconfig.apiServer.extraArgs			List of additional apiServer flags to be set
kubeadmconfig.apiServer.extraVolumes			List of additional volumes to be mounted on apiServer
kubeadmconfig.controllerManager.extraArgs			List of additional ControllerManager flags to be set
kubeadmconfig.scheduler.extraArgs			List of additional Kube Scheduler flags to be set
kubeadmconfig.files			List of additional files to be copied over to the nodes
kubeadmconfig.preKubeadmCommands			List of additional commands to be executed before kubeadm commands are run
kubeadmconfig.postKubeadmCommands			List of additional commands to be executed after kubeadm commands are run

Example Kubeadm config

kubeadmconfig:
  apiServer:
    extraArgs:
      anonymous-auth: "true"
      insecure-port: "0"
      profiling: "false"
    extraVolumes:
      - name: audit-policy
        hostPath: /etc/kubernetes/audit-policy.yaml
        mountPath: /etc/kubernetes/audit-policy.yaml
        readOnly: true
        pathType: File
  controllerManager:
    extraArgs:
      profiling: "false"
      terminated-pod-gc-threshold: "25"
      use-service-account-credentials: "true"
  scheduler:
    extraArgs:
      profiling: "false"
  kubeletExtraArgs:
    read-only-port : "0"
    event-qps: "0"
    protect-kernel-defaults: "true"
  files:
    - path: hardening/audit-policy.yaml
      targetPath: /etc/kubernetes/audit-policy.yaml
      targetOwner: "root:root"
      targetPermissions: "0600"
  preKubeadmCommands:
    - 'echo "Executing preKubeadmCmds"'
  postKubeadmCommands:
    - 'echo "Executing postKubeadmCmds"'

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