Ensure that node certificates are rotated as appropriate

MediumLevel 1Manual reviewdocker

Description

You should rotate swarm node certificates in line with your organizational security policy. Docker Swarm uses TLS for clustering operations between its nodes. Certificate rotation ensures that in an event such as a compromised node or key, it is difficult to impersonate a node. Reported as a manual review item: the audit needs a site-specific judgement.

How it is checked

Audit method: Manual review

This recommendation cannot be checked automatically. A scan lists it with these instructions when you pass --include-manual.

Run one of the commands below and ensure that the node certificate Expiry Duration is set as appropriate. docker info | grep "Expiry Duration" docker info --format 'NodeCertExpiry: {{ .Swarm.Cluster.Spec.CAConfig.NodeCertExpiry }}'

How it is fixed

Fix method: Guidance or infrastructure patch

You should run the command to set the desired expiry time on the node certificate. For example: docker swarm update --cert-expiry 48h

Properties

Operating systems: Any
Tags: dockermanual
Reference: CIS Docker Benchmark v1.9.0 - 7.7 Ensure that node certificates are rotated as appropriate