概述

本文档是对 Rancher v2.3.3 安全加固指南的补充。加固指南提供了用于加固 Rancher 的生产环境集群的指南，该基准自测指南旨在帮助您针对安全基准中的每个控制，来评估加固集群的安全级别。本指南将逐步介绍各种控制，并提供更新的示例命令以审核 Rancher 创建的集群中的合规性。此文档的适用人群是：Rancher 运维人员、安全团队、审核员和决策者。

加固指南旨在与特定版本的安全加固指南，CIS Kubernetes Benchmark，Kubernetes 和 Rancher 一起使用：

由于 Rancher 和 RKE 以容器的方式安装 Kubernetes，因此 CIS Kubernetes Benchmark 中的许多控制验证检查均不适用，完成 CIS 扫描后，这些检测对应的结论是（不适用）。

有关每个审核的更多详细信息，包括测试失败的原因和补救措施，您可以参考 CIS Kubernetes Benchmark v1.4.1 的相应部分。登录后，可以下载基准测试。

Rancher 和 RKE 通过 Docker 容器安装 Kubernetes 服务。配置在初始化时通过给容器传递参数的方式设置，而不是通过配置文件定义。

如果控制审核与原始 CIS 基准不同，则将提供 Rancher Labs 特定的审核命令以进行测试。执行测试时，您将需要访问所有三个 RKE 角色的主机上的 Docker 命令行。这些命令还利用了jq和（使用有效的 kubeconfig 文件）来测试和评估测试结果。

已知的失败的计分测试

Rancher 目前无法通过以下计分测试，Rancher Labs 会通过发布版本升级来解决这些问题。

  • 1.1.21 - Ensure that the --kubelet-certificate-authority argument is set as appropriate (Scored)
  • 2.1.8 - Ensure that the --hostname-override argument is not set (Scored)

1.1.1 - Ensure that the —anonymous-auth argument is set to false (Scored)

Audit

Returned Value: --anonymous-auth=false

Result: Pass

1.1.2 - Ensure that the —basic-auth-file argument is not set (Scored)

Audit

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--basic-auth-file=.*").string'

Returned Value: null

Result: Pass

1.1.3 - Ensure that the —insecure-allow-any-token argument is not set (Scored)

Audit

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--insecure-allow-any-token").string'

Returned Value: null

Result: Pass

1.1.4 - Ensure that the —kubelet-https argument is set to true (Scored)

Audit

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--kubelet-https=false").string'

Returned Value: null

Result: Pass

1.1.5 - Ensure that the —insecure-bind-address argument is not set (Scored)

Notes

Flag not set or --insecure-bind-address=127.0.0.1. RKE sets this flag to --insecure-bind-address=127.0.0.1

Audit

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--insecure-bind-address=(?:(?!127\\.0\\.0\\.1).)+")'

Returned Value: null

Result: Pass

1.1.6 - Ensure that the —insecure-port argument is set to 0 (Scored)

Audit

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--insecure-port=0").string'

Returned Value: --insecure-port=0

Result: Pass

1.1.7 - Ensure that the —secure-port argument is not set to 0 (Scored)

Audit

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--secure-port=6443").string'

Returned Value: --secure-port=6443

Result: Pass

1.1.8 - Ensure that the —profiling argument is set to false (Scored)

Audit

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--profiling=false").string'

Returned Value: --profiling=false

Result: Pass

1.1.9 - Ensure that the —repair-malformed-updates argument is set to false (Scored)

Note: This deprecated flag was removed in 1.14, so it cannot be set.

Result: Pass

1.1.10 - Ensure that the admission control plugin AlwaysAdmit is not set (Scored)

Audit

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--enable-admission-plugins=.*(AlwaysAdmit).*").captures[].string'

Returned Value: null

Result: Pass

1.1.11 - Ensure that the admission control plugin AlwaysPullImages is set (Scored)

Audit

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--enable-admission-plugins=.*(AlwaysPullImages).*").captures[].string'

Returned Value: AlwaysPullImages

Result: Pass

1.1.12 - Ensure that the admission control plugin DenyEscalatingExec is set (Scored)

Audit

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--enable-admission-plugins=.*(DenyEscalatingExec).*").captures[].string'

Returned Value: DenyEscalatingExec

Result: Pass

1.1.13 - Ensure that the admission control plugin SecurityContextDeny is set (Not Scored)

Notes

This SHOULD NOT be set if you are using a PodSecurityPolicy (PSP). From the CIS Benchmark document:

Several system services (such as nginx-ingress) utilize SecurityContext to switch users and assign capabilities. These exceptions to the general principle of not allowing privilege or capabilities can be managed with PSP.

Audit

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--enable-admission-plugins=.*(SecurityContextDeny).*").captures[].string'

Returned Value: null

Result: Document

1.1.14 - Ensure that the admission control plugin NamespaceLifecycle is set (Scored)

Audit

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--enable-admission-plugins=.*(NamespaceLifecycle).*").captures[].string'

Returned Value: NamespaceLifecycle

Result: Pass

1.1.15 - Ensure that the —audit-log-path argument is set as appropriate (Scored)

Notes

This path is the path inside of the container. It’s combined with the RKE cluster.yml extra-binds: option to map the audit log to the host filesystem.

Audit logs should be collected and shipped off-system to guarantee their integrity.

Audit

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--audit-log-path=/var/log/kube-audit/audit-log.json").string'

Returned Value: --audit-log-log=/var/log/kube-audit/audit-log.json

Result: Pass

1.1.16 - Ensure that the —audit-log-maxage argument is set to 30 or as appropriate (Scored)

Notes

Audit logs should be collected and shipped off-system to guarantee their integrity. Rancher Labs recommends setting this argument to a low value to prevent audit logs from filling the local disk.

Audit

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--audit-log-maxage=\\d+").string'

Returned Value: --audit-log-maxage=30

Result: Pass

1.1.17 - Ensure that the —audit-log-maxbackup argument is set to 10 or as appropriate (Scored)

Notes

Audit logs should be collected and shipped off-system to guarantee their integrity. Rancher Labs recommends setting this argument to a low value to prevent audit logs from filling the local disk.

Audit

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--audit-log-maxbackup=\\d+").string'

Returned Value: --audit-log-maxbackup=10

Result: Pass

1.1.18 - Ensure that the —audit-log-maxsize argument is set to 100 or as appropriate (Scored)

Notes

Audit logs should be collected and shipped off-system to guarantee their integrity.

Audit

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--audit-log-maxsize=\\d+").string'

Returned Value: --audit-log-maxsize=100

Result: Pass

1.1.19 - Ensure that the —authorization-mode argument is not set to AlwaysAllow (Scored)

Audit

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--authorization-mode=(Node|RBAC|,)+").string'

Returned Value: --authorization-mode=Node,RBAC

Result: Pass

1.1.20 - Ensure that the —token-auth-file parameter is not set (Scored)

Audit

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--token-auth-file=.*").string'

Returned Value: null

Result: Pass

1.1.21 - Ensure that the —kubelet-certificate-authority argument is set as appropriate (Scored)

Audit

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--kubelet-certificate-authority=.*").string'

Returned Value: --kubelet-certificate-authority=/etc/kubernetes/ssl/kube-ca.pem

Result: Pass

1.1.22 - Ensure that the —kubelet-client-certificate and —kubelet-client-key arguments are set as appropriate (Scored)

Audit (--kubelet-client-certificate)

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--kubelet-client-certificate=.*").string'

Returned Value: --kubelet-client-certificate=/etc/kubernetes/ssl/kube-apiserver.pem

Audit (--kubelet-client-key)

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--kubelet-client-key=.*").string'

Returned Value: --kubelet-client-key=/etc/kubernetes/ssl/kube-apiserver-key.pem

Result: Pass

1.1.23 Ensure that the —service-account-lookup argument is set to true (Scored)

Audit

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--service-account-lookup=true").string'

Returned Value: --service-account-lookup=true

Result: Pass

1.1.24 - Ensure that the admission control plugin PodSecurityPolicy is set (Scored)

Audit

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--enable-admission-plugins=.*(PodSecurityPolicy).*").captures[].string'

Returned Value: PodSecurityPolicy

Result: Pass

1.1.25 - Ensure that the —service-account-key-file argument is set as appropriate (Scored)

Audit

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--service-account-key-file=.*").string'

Returned Value: --service-account-key-file=/etc/kubernetes/ssl/kube-service-account-token-key.pem

Result: Pass

1.1.26 - Ensure that the —etcd-certfile and —etcd-keyfile arguments are set as appropriate (Scored)

Audit (--etcd-certfile)

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--etcd-certfile=.*").string'

Returned Value: --etcd-certfile=/etc/kubernetes/ssl/kube-node.pem

Audit (--etcd-keyfile)

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--etcd-keyfile=.*").string'

Returned Value: --etcd-keyfile=/etc/kubernetes/ssl/kube-node-key.pem

Result: Pass

1.1.27 - Ensure that the admission control plugin ServiceAccount is set (Scored)

Audit

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--enable-admission-plugins=.*(ServiceAccount).*").captures[].string'

Returned Value: ServiceAccount

Result: Pass

1.1.28 - Ensure that the —tls-cert-file and —tls-private-key-file arguments are set as appropriate (Scored)

Audit (--tls-cert-file)

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--tls-cert-file=.*").string'

Returned Value: --tls-cert-file=/etc/kubernetes/ssl/kube-apiserver.pem

Audit (--tls-key-file)

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--tls-private-key-file=.*").string'

Returned Value: --tls-private-key-file=/etc/kubernetes/ssl/kube-apiserver-key.pem

Result: Pass

1.1.29 - Ensure that the —client-ca-file argument is set as appropriate (Scored)

Audit

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--client-ca-file=.*").string'

Returned Value: --client-ca-file=/etc/kubernetes/ssl/kube-ca.pem

Result: Pass

1.1.30 - Ensure that the API Server only makes use of strong cryptographic ciphers (Not Scored)

Audit (Allowed Ciphers)

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--tls-cipher-suites=.*(TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256).*").captures[].string'

Returned Value: TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--tls-cipher-suites=.*(TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256).*").captures[].string'

Returned Value: TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--tls-cipher-suites=.*(TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305).*").captures[].string'

Returned Value: TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--tls-cipher-suites=.*(TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384).*").captures[].string'

Returned Value: TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--tls-cipher-suites=.*(TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305).*").captures[].string'

Returned Value: TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--tls-cipher-suites=.*(TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384).*").captures[].string'

Returned Value: TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--tls-cipher-suites=.*(TLS_RSA_WITH_AES_256_GCM_SHA384).*").captures[].string'

Returned Value: TLS_RSA_WITH_AES_256_GCM_SHA384

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--tls-cipher-suites=.*(TLS_RSA_WITH_AES_128_GCM_SHA256).*").captures[].string'

Returned Value: TLS_RSA_WITH_AES_128_GCM_SHA256

Audit (Disallowed Ciphers)

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--tls-cipher-suites=.*(CBC).*").captures[].string'

Returned Value: null

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--tls-cipher-suites=.*(RC4).*").captures[].string'

Returned Value: null

Result: Pass

1.1.31 - Ensure that the —etcd-cafile argument is set as appropriate (Scored)

Audit

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--etcd-cafile=.*").string'

Returned Value: --etcd-cafile=/etc/kubernetes/ssl/kube-ca.pem

Result: Pass

1.1.32 - Ensure that the —authorization-mode argument includes Node (Scored)

Audit

Returned Value: --authorization-mode=Node,RBAC

Result: Pass

1.1.33 - Ensure that the admission control plugin NodeRestriction is set (Scored)

Audit

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--enable-admission-plugins=.*(NodeRestriction).*").captures[].string'

Returned Value: NodeRestriction

Result: Pass

1.1.34 - Ensure that the —experimental-encryption-provider-config argument is set as appropriate (Scored)

Notes In Kubernetes 1.16.x this flag is --encryption-provider-config

Audit

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--encryption-provider-config=.*").string'

Returned Value: encryption-provider-config=/etc/kubernetes/ssl/encryption.yaml

Result: Pass

1.1.35 - Ensure that the encryption provider is set to aescbc (Scored)

Notes

Only the first provider in the list is active.

Audit

  1. grep -A 1 providers: /etc/kubernetes/ssl/encryption.yaml | grep aescbc

Returned Value: - aescbc:

Result: Pass

1.1.36 - Ensure that the admission control plugin EventRateLimit is set (Scored)

Notes

The EventRateLimit plugin requires setting the --admission-control-config-file option and configuring details in the following files:

  • /etc/kubernetes/admission.yaml

See Host Configuration for details.

Audit (Admissions plugin)

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--enable-admission-plugins=.*(EventRateLimit).*").captures[].string'

Returned Value: EventRateLimit

Audit (--admission-control-config-file)

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--admission-control-config-file=.*").string'

Returned Value: --admission-control-config-file=/etc/kubernetes/admission.yaml

Result: Pass

1.1.37 Ensure that the AdvancedAuditing argument is not set to false (Scored)

AdvancedAuditing=false should not be set, but --audit-policy-file should be set and configured. See Host Configuration for a sample audit policy file.

Audit (Feature Gate)

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--feature-gates=.*(AdvancedAuditing=false).*").captures[].string'

Returned Value:

Audit (Audit Policy File)

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--audit-policy-file=.*").string'

Returned Value: --audit-policy-file=/etc/kubernetes/audit-policy.yaml

Result: Pass

1.1.38 Ensure that the —request-timeout argument is set as appropriate (Scored)

Notes

RKE uses the default value of 60s and doesn’t set this option. Tuning this value is specific to the environment.

Audit

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--request-timeout=.*").string'

Returned Value: null

Result: Pass

Ensure that the —authorization-mode argument includes RBAC (Scored)

Audit

  1. docker inspect kube-apiserver | jq -e '.[0].Args[] | match("--authorization-mode=.*").string'

Returned Value: "--authorization-mode=Node,RBAC"

Result: Pass

1.2 - Scheduler

1.2.1 - Ensure that the —profiling argument is set to false (Scored)

Audit

  1. docker inspect kube-scheduler | jq -e '.[0].Args[] | match("--profiling=false").string'

Returned Value: --profiling=false

Result: Pass

1.2.2 - Ensure that the —address argument is set to 127.0.0.1 (Scored)

Audit

  1. docker inspect kube-scheduler | jq -e '.[0].Args[] | match("--address=127\\.0\\.0\\.1").string'

Returned Value: --address=127.0.0.1

Result: Pass

1.3.1 - Ensure that the —terminated-pod-gc-threshold argument is set as appropriate (Scored)

Audit

  1. docker inspect kube-controller-manager | jq -e '.[0].Args[] | match("--terminated-pod-gc-threshold=\\d+").string'

Returned Value: --terminated-pod-gc-threshold=1000

Result: Pass

1.3.2 - Ensure that the —profiling argument is set to false (Scored)

Audit

  1. docker inspect kube-controller-manager | jq -e '.[0].Args[] | match("--profiling=false").string'

Returned Value: --profiling=false

Result: Pass

1.3.3 - Ensure that the —use-service-account-credentials argument is set to true (Scored)

Audit

  1. docker inspect kube-controller-manager | jq -e '.[0].Args[] | match("--use-service-account-credentials=true").string'

Returned Value: --use-service-account-credentials=true

Result: Pass

1.3.4 - Ensure that the —service-account-private-key-file argument is set as appropriate (Scored)

Audit

  1. docker inspect kube-controller-manager | jq -e '.[0].Args[] | match("--service-account-private-key-file=.*").string'

Returned Value: --service-account-private-key-file=/etc/kubernetes/ssl/kube-service-account-token-key.pem

Result: Pass

1.3.5 - Ensure that the —root-ca-file argument is set as appropriate (Scored)

Audit

  1. docker inspect kube-controller-manager | jq -e '.[0].Args[] | match("--root-ca-file=.*").string'

Returned Value: --root-ca-file=/etc/kubernetes/ssl/kube-ca.pem

Result: Pass

1.3.6 - Ensure that the RotateKubeletServerCertificate argument is set to true (Scored)

Notes

RKE does not yet support certificate rotation. This feature is due for the 0.1.12 release of RKE.

Audit

  1. docker inspect kube-controller-manager | jq -e '.[0].Args[] | match("--feature-gates=.*(RotateKubeletServerCertificate=true).*").captures[].string'

Returned Value: RotateKubeletServerCertificate=true

Result: Pass

1.3.7 - Ensure that the —address argument is set to 127.0.0.1 (Scored)

Audit

  1. docker inspect kube-controller-manager | jq -e '.[0].Args[] | match("--address=127\\.0\\.0\\.1").string'

Returned Value: --address=127.0.0.1

Result: Pass

1.4 - Configuration Files

1.4.1 - Ensure that the API server pod specification file permissions are set to 644 or more restrictive (Scored)

Notes

RKE doesn’t require or maintain a configuration file for kube-apiserver. All configuration is passed in as arguments at container run time.

Result: Pass (Not Applicable)

1.4.2 - Ensure that the API server pod specification file ownership is set to root:root (Scored)

Notes

RKE doesn’t require or maintain a configuration file for kube-apiserver. All configuration is passed in as arguments at container run time.

Result: Pass (Not Applicable)

1.4.3 - Ensure that the controller manager pod specification file permissions are set to 644 or more restrictive (Scored)

Notes

RKE doesn’t require or maintain a configuration file for kube-controller-manager. All configuration is passed in as arguments at container run time.

Result: Pass (Not Applicable)

1.4.4 - Ensure that the controller manager pod specification file ownership is set to root:root (Scored)

Notes

RKE doesn’t require or maintain a configuration file for kube-controller-manager. All configuration is passed in as arguments at container run time.

Result: Pass (Not Applicable)

1.4.5 - Ensure that the scheduler pod specification file permissions are set to 644 or more restrictive (Scored)

Notes

RKE doesn’t require or maintain a configuration file for kube-scheduler. All configuration is passed in as arguments at container run time.

Result: Pass (Not Applicable)

1.4.6 - Ensure that the scheduler pod specification file ownership is set to root:root (Scored)

Notes

RKE doesn’t require or maintain a configuration file for kube-scheduler. All configuration is passed in as arguments at container run time.

Result: Pass (Not Applicable)

1.4.7 - Ensure that the etcd pod specification file permissions are set to 644 or more restrictive (Scored)

Notes

RKE doesn’t require or maintain a configuration file for etcd. All configuration is passed in as arguments at container run time.

Result: Pass (Not Applicable)

1.4.8 - Ensure that the etcd pod specification file ownership is set to root:root (Scored)

Notes

RKE doesn’t require or maintain a configuration file for etcd. All configuration is passed in as arguments at container run time.

Result: Pass (Not Applicable)

1.4.9 - Ensure that the Container Network Interface file permissions are set to 644 or more restrictive (Not Scored)

Notes

This is a manual check.

Audit (/var/lib/cni/networks/k8s-pod-network)

Note This may return a lockfile. Permissions on this file do not need to be as restrictive as the CNI files.

  1. stat -c "%n - %a" /var/lib/cni/networks/k8s-pod-network/*

Returned Value:

  1. /var/lib/cni/networks/k8s-pod-network/10.42.0.2 - 644
  2. /var/lib/cni/networks/k8s-pod-network/10.42.0.3 - 644
  3. /var/lib/cni/networks/k8s-pod-network/last_reserved_ip.0 - 644
  4. /var/lib/cni/networks/k8s-pod-network/lock - 750

Audit (/etc/cni/net.d)

  1. stat -c "%n - %a" /etc/cni/net.d/*

Returned Value:

  1. /etc/cni/net.d/10-canal.conflist - 644
  2. /etc/cni/net.d/calico-kubeconfig - 600

Result: Pass

1.4.10 - Ensure that the Container Network Interface file ownership is set to root:root (Not Scored)

Notes

This is a manual check.

Audit (/var/lib/cni/networks/k8s-pod-network)

  1. stat -c "%n - %U:%G" /var/lib/cni/networks/k8s-pod-network/*

Returned Value:

  1. /var/lib/cni/networks/k8s-pod-network/10.42.0.2 - root:root
  2. /var/lib/cni/networks/k8s-pod-network/10.42.0.3 - root:root
  3. /var/lib/cni/networks/k8s-pod-network/last_reserved_ip.0 - root:root
  4. /var/lib/cni/networks/k8s-pod-network/lock - root:root

Audit (/etc/cni/net.d)

  1. stat -c "%n - %U:%G" /etc/cni/net.d/*

Returned Value:

  1. /etc/cni/net.d/10-canal.conflist - root:root
  2. /etc/cni/net.d/calico-kubeconfig - root:root

Result: Pass

1.4.11 - Ensure that the etcd data directory permissions are set to 700 or more restrictive (Scored)

Notes

Files underneath the data dir have permissions set to 700

  1. stat -c "%n - %a" /var/lib/etcd/*

Audit

  1. stat -c %a /var/lib/etcd

Returned Value: 700

Result: Pass

1.4.12 - Ensure that the etcd data directory ownership is set to etcd:etcd (Scored)

Notes

The etcd container runs as the etcd user. The data directory and files are owned by etcd.

Audit

  1. stat -c %U:%G /var/lib/etcd

Returned Value: etcd:etcd

Result: Pass

1.4.13 - Ensure that the file permissions for admin.conf are set to 644 or more restrictive (Scored)

Notes

RKE does not store the kubernetes default kubeconfig credentials file on the nodes. It’s presented to user where RKE is run. We recommend that this kube_config_cluster.yml file be kept in secure store.

Result: Pass (Not Applicable)

1.4.14 - Ensure that ownership of admin.conf is set to root:root (Scored)

Notes

RKE does not store the default kubectl config credentials file on the nodes. It presents credentials to the user when rke is first run, and only on the device where the user ran the command. Rancher Labs recommends that this kube_config_cluster.yml file be kept in secure store.

Result: Pass (Not Applicable)

1.4.15 - Ensure that the file permissions for scheduler.conf are set to 644 or more restrictive (Scored)

Audit

  1. stat -c %a /etc/kubernetes/ssl/kubecfg-kube-scheduler.yaml

Returned Value: 640

Result: Pass

1.4.16 - Ensure that the file ownership of scheduler.conf is set to root:root (Scored)

Audit

  1. stat -c %U:%G /etc/kubernetes/ssl/kubecfg-kube-scheduler.yaml

Returned Value: root:root

Result: Pass

1.4.17 - Ensure that the file permissions for controller-manager.conf are set to 644 or more restrictive (Scored)

Audit

  1. stat -c %a /etc/kubernetes/ssl/kubecfg-kube-controller-manager.yaml

Returned Value: 640

Result: Pass

1.4.18 - Ensure that the file ownership of controller-manager.conf is set to root:root (Scored)

Audit

  1. stat -c %U:%G /etc/kubernetes/ssl/kubecfg-kube-controller-manager.yaml

Returned Value: root:root

Result: Pass

1.4.19 - Ensure that the Kubernetes PKI directory and file ownership is set to root:root (Scored)

Audit

  1. ls -laR /etc/kubernetes/ssl/ |grep -v yaml

Returned Value:

  1. total 128
  2. drwxr-xr-x 2 root root 4096 Jul  1 19:53 .
  3. drwxr-xr-x 4 root root 4096 Jul  1 19:53 ..
  4. -rw------- 1 root root 1679 Jul  1 19:53 kube-apiserver-key.pem
  5. -rw------- 1 root root 1679 Jul  1 19:53 kube-apiserver-proxy-client-key.pem
  6. -rw-r--r-- 1 root root 1107 Jul  1 19:53 kube-apiserver-proxy-client.pem
  7. -rw------- 1 root root 1675 Jul  1 19:53 kube-apiserver-requestheader-ca-key.pem
  8. -rw-r--r-- 1 root root 1082 Jul  1 19:53 kube-apiserver-requestheader-ca.pem
  9. -rw-r--r-- 1 root root 1285 Jul  1 19:53 kube-apiserver.pem
  10. -rw------- 1 root root 1675 Jul  1 19:53 kube-ca-key.pem
  11. -rw-r--r-- 1 root root 1017 Jul  1 19:53 kube-ca.pem
  12. -rw------- 1 root root 1679 Jul  1 19:53 kube-controller-manager-key.pem
  13. -rw-r--r-- 1 root root 1062 Jul  1 19:53 kube-controller-manager.pem
  14. -rw------- 1 root root 1675 Jul  1 19:53 kube-etcd-172-31-16-161-key.pem
  15. -rw-r--r-- 1 root root 1277 Jul  1 19:53 kube-etcd-172-31-16-161.pem
  16. -rw------- 1 root root 1679 Jul  1 19:53 kube-etcd-172-31-24-134-key.pem
  17. -rw-r--r-- 1 root root 1277 Jul  1 19:53 kube-etcd-172-31-24-134.pem
  18. -rw------- 1 root root 1675 Jul  1 19:53 kube-etcd-172-31-30-57-key.pem
  19. -rw-r--r-- 1 root root 1277 Jul  1 19:53 kube-etcd-172-31-30-57.pem
  20. -rw------- 1 root root 1679 Jul  1 19:53 kube-node-key.pem
  21. -rw-r--r-- 1 root root 1070 Jul  1 19:53 kube-node.pem
  22. -rw------- 1 root root 1679 Jul  1 19:53 kube-proxy-key.pem
  23. -rw-r--r-- 1 root root 1046 Jul  1 19:53 kube-proxy.pem
  24. -rw------- 1 root root 1679 Jul  1 19:53 kube-scheduler-key.pem
  25. -rw-r--r-- 1 root root 1050 Jul  1 19:53 kube-scheduler.pem
  26. -rw------- 1 root root 1679 Jul  1 19:53 kube-service-account-token-key.pem
  27. -rw-r--r-- 1 root root 1285 Jul  1 19:53 kube-service-account-token.pem

Result: Pass

1.4.20 - Ensure that the Kubernetes PKI certificate file permissions are set to 644 or more restrictive (Scored)

Audit

  1. stat -c "%n - %a" /etc/kubernetes/ssl/*.pem |grep -v key

Returned Value:

  1. /etc/kubernetes/ssl/kube-apiserver-proxy-client.pem - 640
  2. /etc/kubernetes/ssl/kube-apiserver-requestheader-ca.pem - 640
  3. /etc/kubernetes/ssl/kube-apiserver.pem - 640
  4. /etc/kubernetes/ssl/kube-ca.pem - 640
  5. /etc/kubernetes/ssl/kube-controller-manager.pem - 640
  6. /etc/kubernetes/ssl/kube-etcd-172-31-16-161.pem - 640
  7. /etc/kubernetes/ssl/kube-etcd-172-31-24-134.pem - 640
  8. /etc/kubernetes/ssl/kube-etcd-172-31-30-57.pem - 640
  9. /etc/kubernetes/ssl/kube-node.pem - 640
  10. /etc/kubernetes/ssl/kube-proxy.pem - 640
  11. /etc/kubernetes/ssl/kube-scheduler.pem - 640
  12. /etc/kubernetes/ssl/kube-service-account-token.pem - 640

Result: Pass

1.4.21 - Ensure that the Kubernetes PKI key file permissions are set to 600 (Scored)

Audit

  1. stat -c "%n - %a" /etc/kubernetes/ssl/*key*

Returned Value:

  1. /etc/kubernetes/ssl/kube-apiserver-key.pem - 600
  2. /etc/kubernetes/ssl/kube-apiserver-proxy-client-key.pem - 600
  3. /etc/kubernetes/ssl/kube-apiserver-requestheader-ca-key.pem - 600
  4. /etc/kubernetes/ssl/kube-ca-key.pem - 600
  5. /etc/kubernetes/ssl/kube-controller-manager-key.pem - 600
  7. /etc/kubernetes/ssl/kube-etcd-172-31-24-134-key.pem - 600
  8. /etc/kubernetes/ssl/kube-etcd-172-31-30-57-key.pem - 600
  9. /etc/kubernetes/ssl/kube-node-key.pem - 600
  10. /etc/kubernetes/ssl/kube-proxy-key.pem - 600
  11. /etc/kubernetes/ssl/kube-scheduler-key.pem - 600
  12. /etc/kubernetes/ssl/kube-service-account-token-key.pem - 600

Result: Pass

1.5.1 - Ensure that the —cert-file and —key-file arguments are set as appropriate (Scored)

Audit (--cert-file)

  1. docker inspect etcd | jq -e '.[0].Args[] | match("--cert-file=.*").string'

Note Certificate file name may vary slightly, since it contains the IP of the etcd container.

Returned Value: --cert-file=/etc/kubernetes/ssl/kube-etcd-172-31-24-134.pem

Audit (--key-file)

  1. docker inspect etcd | jq -e '.[0].Args[] | match("--key-file=.*").string'

Note Key file name may vary slightly, since it contains the IP of the etcd container.

Returned Value: --key-file=/etc/kubernetes/ssl/kube-etcd-172-31-24-134-key.pem

Result: Pass

1.5.2 - Ensure that the —client-cert-auth argument is set to true (Scored)

Notes

Setting “—client-cert-auth” is the equivalent of setting “—client-cert-auth=true”.

Audit

Returned Value: --client-cert-auth

Result: Pass

1.5.3 - Ensure that the —auto-tls argument is not set to true (Scored)

Audit

  1. docker inspect etcd | jq -e '.[0].Args[] | match("--auto-tls(?:(?!=false).*)").string'

Returned Value: null

Result: Pass

1.5.4 - Ensure that the —peer-cert-file and —peer-key-file arguments are set as appropriate (Scored)

Audit (--peer-cert-file)

  1. docker inspect etcd | jq -e '.[0].Args[] | match("--peer-cert-file=.*").string'

Note Certificate file name may vary slightly, since it contains the IP of the etcd container.

Returned Value: --peer-cert-file=/etc/kubernetes/ssl/kube-etcd-172-31-22-135.pem

Audit (--peer-key-file)

  1. docker inspect etcd | jq -e '.[0].Args[] | match("--peer-key-file=.*").string'

Note Key file name may vary slightly, since it contains the IP of the etcd container.

Returned Value: --peer-key-file=/etc/kubernetes/ssl/kube-etcd-172-31-22-135-key.pem

Result: Pass

1.5.5 - Ensure that the —peer-client-cert-auth argument is set to true (Scored)

Notes

Setting --peer-client-cert-auth is the equivalent of setting --peer-client-cert-auth=true.

Audit

  1. docker inspect etcd | jq -e '.[0].Args[] | match("--peer-client-cert-auth(=true)*").string'

Returned Value: --peer-client-cert-auth

Result: Pass

1.5.6 - Ensure that the —peer-auto-tls argument is not set to true (Scored)

Audit

  1. docker inspect etcd | jq -e '.[0].Args[] | match("--peer-auto-tls(?:(?!=false).*)").string'

Returned Value: null

Result: Pass

1.5.7 - Ensure that a unique Certificate Authority is used for etcd (Not Scored)

Mitigation

RKE supports connecting to an external etcd cluster. This external cluster could be configured with its own discreet CA.

Notes

--trusted-ca-file is set and different from the --client-ca-file used by kube-apiserver.

  1. docker inspect etcd | jq -e '.[0].Args[] | match("--trusted-ca-file=(?:(?!/etc/kubernetes/ssl/kube-ca.pem).*)").string'

Returned Value: null

Result: Pass (See Mitigation)

1.6 - General Security Primitives

These “Not Scored” controls are implementation best practices. To ease the administrative burden, we recommend that you implement these best practices on your workload clusters by creating clusters with Rancher rather than using RKE alone.

1.6.1 - Ensure that the cluster-admin role is only used where required (Not Scored)

Rancher has built in support for maintaining and enforcing Kubernetes RBAC on your workload clusters.

Rancher has the ability integrate with external authentication sources (LDAP, SAML, AD…) allows easy access with unique credentials to your existing users or groups.

1.6.2 - Create administrative boundaries between resources using namespaces (Not Scored)

With Rancher, users or groups can be assigned access to all clusters, a single cluster or a “Project” (a group of one or more namespaces in a cluster). This allows granular access control to cluster resources.

1.6.3 - Create network segmentation using Network Policies (Not Scored)

Rancher can (optionally) automatically create Network Policies to isolate “Projects” (a group of one or more namespaces) in a cluster.

See “Cluster Options” when creating a cluster with Rancher to turn on Network Isolation.

1.6.4 - Ensure that the seccomp profile is set to docker/default in your pod definitions (Not Scored)

Since this requires the enabling of AllAlpha feature gates we would not recommend enabling this feature at the moment.

1.6.5 - Apply security context to your pods and containers (Not Scored)

This practice does go against control 1.1.13, but we prefer using a PodSecurityPolicy and allowing security context to be set over a blanket deny.

Rancher allows users to set various Security Context options when launching pods via the GUI interface.

1.6.6 - Configure image provenance using the ImagePolicyWebhook admission controller (Not Scored)

Image Policy Webhook requires a 3rd party service to enforce policy. This can be configured in the --admission-control-config-file. See the Host configuration section for the admission.yaml file.

1.6.7 - Configure network policies as appropriate (Not Scored)

Rancher can (optionally) automatically create Network Policies to isolate projects (a group of one or more namespaces) within a cluster.

See the Cluster Options section when creating a cluster with Rancher to turn on network isolation.

1.6.8 - Place compensating controls in the form of PodSecurityPolicy (PSP) and RBAC for privileged container usage (Not Scored)

Section 1.7 of this guide shows how to add and configure a default “restricted” PSP based on controls.

With Rancher you can create a centrally maintained “restricted” PSP and deploy it to all of the clusters that Rancher manages.

1.7 - Pod Security Policies (PSP)

This RKE configuration has two Pod Security Policies.

  • default-psp: assigned to namespaces that require additional privileged access: kube-system, ingress-nginx and cattle-system.
  • restricted-psp: This is the cluster default PSP and follows the best practices defined by controls in this section.

1.7.1 - Do not admit privileged containers (Not Scored)

Notes

The restricted PodSecurityPolicy is available to all ServiceAccounts.

Audit

  1. kubectl get psp restricted-psp -o jsonpath='{.spec.privileged}' | grep "true"

Returned Value: null

Result: Pass

1.7.2 - Do not admit containers wishing to share the host process ID namespace (Scored)

Notes

The restricted PodSecurityPolicy is available to all ServiceAccounts.

Audit

  1. kubectl get psp restricted-psp -o jsonpath='{.spec.hostPID}' | grep "true"

Returned Value: null

Result: Pass

1.7.3 - Do not admit containers wishing to share the host IPC namespace (Scored)

Notes

The restricted PodSecurityPolicy is available to all ServiceAccounts.

Audit

  1. kubectl get psp restricted-psp -o jsonpath='{.spec.hostIPC}' | grep "true"

Returned Value: null

Result: Pass

1.7.4 - Do not admit containers wishing to share the host network namespace (Scored)

Notes

The restricted PodSecurityPolicy is available to all ServiceAccounts.

Audit

  1. kubectl get psp restricted-psp -o jsonpath='{.spec.hostNetwork}' | grep "true"

Returned Value: null

Result: Pass

1.7.5 - Do not admit containers with allowPrivilegeEscalation (Scored)

Notes

The restricted PodSecurityPolicy is available to all ServiceAccounts.

Audit

  1. kubectl get psp restricted-psp -o jsonpath='{.spec.allowPrivilegeEscalation}' | grep "true"

Returned Value: null

Result: Pass

1.7.6 - Do not admit containers whose processes run as root (Not Scored)

Notes

The restricted PodSecurityPolicy is available to all ServiceAccounts.

Audit

  1. kubectl get psp restricted-psp -o jsonpath='{.spec.runAsUser.rule}' | grep "RunAsAny"

Returned Value: RunAsAny

Result: Pass

1.7.7 - Do not admit containers with dangerous capabilities (Not Scored)

Notes

The restricted PodSecurityPolicy is available to all ServiceAccounts.

Audit

  1. kubectl get psp restricted-psp -o jsonpath='{.spec.requiredDropCapabilities}' | grep "NET_RAW"

Returned Value: null

Result: Pass

2 - Worker Node Security Configuration

2.1 - Kubelet

2.1.1 - Ensure that the —anonymous-auth argument is set to false (Scored)

Audit

  1. docker inspect kubelet | jq -e '.[0].Args[] | match("--anonymous-auth=false").string'

Returned Value: --anonymous-auth=false

Result: Pass

2.1.2 - Ensure that the —authorization-mode argument is not set to AlwaysAllow (Scored)

Audit

  1. docker inspect kubelet | jq -e '.[0].Args[] | match("--authorization-mode=Webhook").string'

Returned Value: --authorization-mode=Webhook

Result: Pass

2.1.3 - Ensure that the —client-ca-file argument is set as appropriate (Scored)

Audit

  1. docker inspect kubelet | jq -e '.[0].Args[] | match("--client-ca-file=.*").string'

Returned Value: --client-ca-file=/etc/kubernetes/ssl/kube-ca.pem

Result: Pass

2.1.4 - Ensure that the —read-only-port argument is set to 0 (Scored)

Audit

  1. docker inspect kubelet | jq -e '.[0].Args[] | match("--read-only-port=0").string'

Returned Value: --read-only-port=0

Result: Pass

2.1.5 - Ensure that the —streaming-connection-idle-timeout argument is not set to 0 (Scored)

Audit

  1. docker inspect kubelet | jq -e '.[0].Args[] | match("--streaming-connection-idle-timeout=.*").string'

Returned Value: --streaming-connection-idle-timeout=30m

Result: Pass

2.1.6 - Ensure that the —protect-kernel-defaults argument is set to true (Scored)

Audit

  1. docker inspect kubelet | jq -e '.[0].Args[] | match("--protect-kernel-defaults=true").string'

Returned Value: --protect-kernel-defaults=true

Result: Pass

2.1.7 - Ensure that the —make-iptables-util-chains argument is set to true (Scored)

Audit

  1. docker inspect kubelet | jq -e '.[0].Args[] | match("--make-iptables-util-chains=true").string'

Returned Value: --make-iptables-util-chains=true

Result: Pass

2.1.8 - Ensure that the —hostname-override argument is not set (Scored)

Notes This is used by most cloud providers. Not setting this is not practical in most cases.

Audit

  1. docker inspect kubelet | jq -e '.[0].Args[] | match("--hostname-override=.*").string'

Returned Value: --hostname-override=<ipv4 address>

Result: Fail

2.1.9 - Ensure that the —event-qps argument is set to 0 (Scored)

Audit

  1. docker inspect kubelet | jq -e '.[0].Args[] | match("--event-qps=0").string'

Returned Value: --event-qps=0

Result: Pass

2.1.10 - Ensure that the —tls-cert-file and —tls-private-key-file arguments are set as appropriate (Scored)

Notes

RKE does not set these options and uses the kubelet’s self generated certificates for TLS communication. These files are located in the default directory (/var/lib/kubelet/pki).

Audit (--tls-cert-file)

  1. docker inspect kubelet | jq -e '.[0].Args[] | match("--tls-cert-file=.*").string'

Returned Value: --tls-cert-file=/etc/kubernetes/ssl/kube-kubelet-172-31-40-84.pem

Audit (--tls-private-key-file)

  1. docker inspect kubelet | jq -e '.[0].Args[] | match("--tls-private-key-file=.*").string'

Returned Value: --tls-private-key-file=/etc/kubernetes/ssl/kube-kubelet-172-31-40-84-key.pem

Result: Pass

2.1.11 - Ensure that the —cadvisor-port argument is set to 0 (Scored)

Audit

  1. docker inspect kubelet | jq -e '.[0].Args[] | match("--cadvisor-port=0").string'

Returned Value: null

Result: Pass

2.1.12 - Ensure that the —rotate-certificates argument is not set to false (Scored)

Notes

RKE handles certificate rotation through an external process.

Audit

  1. docker inspect kubelet | jq -e '.[0].Args[] | match("--rotate-certificates=true").string'

Returned Value: null

Result: Pass (Not Applicable)

2.1.13 - Ensure that the RotateKubeletServerCertificate argument is set to true (Scored)

Audit

  1. docker inspect kubelet | jq -e '.[0].Args[] | match("--feature-gates=.*(RotateKubeletServerCertificate=true).*").captures[].string'

Returned Value: RotateKubeletServerCertificate=true

Result: Pass

2.1.14 - Ensure that the kubelet only makes use of strong cryptographic ciphers (Not Scored)

Audit (Allowed Ciphers)

  1. docker inspect kubelet | jq -e '.[0].Args[] | match("--tls-cipher-suites=.*(TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256).*").captures[].string'

Returned Value: TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256

Audit

  1. docker inspect kubelet | jq -e '.[0].Args[] | match("--tls-cipher-suites=.*(TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256).*").captures[].string'

Returned Value: TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256

Audit

  1. docker inspect kubelet | jq -e '.[0].Args[] | match("--tls-cipher-suites=.*(TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305).*").captures[].string'

Returned Value: TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305

Audit

  1. docker inspect kubelet | jq -e '.[0].Args[] | match("--tls-cipher-suites=.*(TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384).*").captures[].string'

Returned Value: TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384

Audit

  1. docker inspect kubelet | jq -e '.[0].Args[] | match("--tls-cipher-suites=.*(TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305).*").captures[].string'

Returned Value: TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305

Audit

  1. docker inspect kubelet | jq -e '.[0].Args[] | match("--tls-cipher-suites=.*(TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384).*").captures[].string'

Returned Value: TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384

Audit

  1. docker inspect kubelet | jq -e '.[0].Args[] | match("--tls-cipher-suites=.*(TLS_RSA_WITH_AES_256_GCM_SHA384).*").captures[].string'

Returned Value: TLS_RSA_WITH_AES_256_GCM_SHA384

Audit

  1. docker inspect kubelet | jq -e '.[0].Args[] | match("--tls-cipher-suites=.*(TLS_RSA_WITH_AES_128_GCM_SHA256).*").captures[].string'

Returned Value: TLS_RSA_WITH_AES_128_GCM_SHA256

Audit (Disallowed Ciphers)

  1. docker inspect kubelet | jq -e '.[0].Args[] | match("--tls-cipher-suites=.*(CBC).*").captures[].string'

Returned Value: null

Audit

  1. docker inspect kubelet | jq -e '.[0].Args[] | match("--tls-cipher-suites=.*(RC4).*").captures[].string'

Returned Value: null

Result: Pass

2.2.1 - Ensure that the permissions for kubelet.conf are set to 644 or more restrictive (Scored)

Notes

This is the value of the --kubeconfig option.

Audit

  1. stat -c %a /etc/kubernetes/ssl/kubecfg-kube-node.yaml

Returned Value: 640

Result: Pass

2.2.2 - Ensure that the kubelet.conf file ownership is set to root:root (Scored)

Notes

This is the value of the --kubeconfig option.

Audit

  1. stat -c %U:%G /etc/kubernetes/ssl/kubecfg-kube-node.yaml

Returned Value: root:root

Result: Pass

2.2.3 - Ensure that the kubelet service file permissions are set to 644 or more restrictive (Scored)

Notes

RKE doesn’t require or maintain a configuration file for kubelet. All configuration is passed in as arguments at container run time.

Result: Pass (Not Applicable)

2.2.4 - Ensure that the kubelet service file ownership is set to root:root (Scored)

Notes

RKE doesn’t require or maintain a configuration file for kubelet. All configuration is passed in as arguments at container run time.

Result: Pass (Not Applicable)

2.2.5 - Ensure that the proxy kubeconfig file permissions are set to 644 or more restrictive (Scored)

Audit

  1. stat -c %a /etc/kubernetes/ssl/kubecfg-kube-proxy.yaml

Returned Value: 640

Result: Pass

2.2.6 - Ensure that the proxy kubeconfig file ownership is set to root:root (Scored)

Audit

    Returned Value: root:root

    Result: Pass

    2.2.7 - Ensure that the certificate authorities file permissions are set to 644 or more restrictive (Scored)

    Audit

    Returned Value: 640

    Result: Pass

    2.2.8 - Ensure that the client certificate authorities file ownership is set to root:root (Scored)

    Audit

    1. stat -c %U:%G /etc/kubernetes/ssl/kube-ca.pem

    Returned Value: root:root

    Result: Pass

    2.2.9 - Ensure that the kubelet configuration file ownership is set to root:root (Scored)

    Notes

    RKE doesn’t require or maintain a configuration file for kubelet. All configuration is passed in as arguments at container run time.

    Result: Pass (Not Applicable)

    2.2.10 - Ensure that the kubelet configuration file permissions are set to 644 or more restrictive (Scored)

    Notes

    RKE doesn’t require or maintain a configuration file for kubelet. All configuration is passed in as arguments at container run time.

    Result: Pass (Not Applicable)