Cis K8S V1111 2.1

2.1 Ensure that the --cert-file and --key-file arguments are set as appropriate (Automated)

Profile Applicability

• Level 1 - Master Node

Description

Configure TLS encryption for the etcd service.

Rationale

etcd is a highly-available key value store used by Kubernetes deployments for persistent storage of all of its REST API objects. These objects are sensitive in nature and should be encrypted in transit.

Impact

Client connections only over TLS would be served.

Audit

Run the following command on the etcd server node:

ps -ef | grep etcd

Verify that the --cert-file and the --key-file arguments are set as appropriate.

Remediation

Follow the etcd service documentation and configure TLS encryption. Then, edit the etcd pod specification file /etc/kubernetes/manifests/etcd.yaml on the master node and set the below parameters.

--cert-file=</path/to/ca-file>
--key-file=</path/to/key-file>

Default Value

By default, TLS encryption is not set.

References

1. https://coreos.com/etcd/docs/latest/op-guide/security.html
2. https://kubernetes.io/docs/admin/etcd/

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