# Cis Docker V170 7.7

> Ensure that node certificates are rotated as appropriate

- Skill: `cyberstrikeus/cis-docker-v170-7-7` (Agent Skill)
- Install (CLI): `npx skillmds@latest add cyberstrikeus/cis-docker-v170-7-7`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cyberstrikeus/cis-docker-v170-7-7/raw
- Safety review: PASS (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: DevOps & Infra
- Author: cyberstrikeus (https://skillmd.com/u/cyberstrikeus)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/cyberstrikeus/cis-docker-v170-7-7

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# CIS Docker Benchmark v1.7.0 - Control 7.7

## Profile Applicability

- **Level:** 1
- **Type:** Manual
- **Platform:** Docker Swarm

## Description

You should rotate swarm node certificates in line with your organizational security policy.

## Rationale

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. By default, node certificates are rotated every 90 days, but you should rotate them more often or as appropriate in your environment.

## Impact

None

## Audit Procedure

Run one of the commands below and ensure that the node certificate `Expiry Duration` is set as appropriate.

```bash
docker info | grep "Expiry Duration"
docker info --format 'NodeCertExpiry: {{ .Swarm.Cluster.Spec.CAConfig.NodeCertExpiry }}'
```

## Remediation

You should run the command to set the desired expiry time on the node certificate.

For example:

```bash
docker swarm update --cert-expiry 48h
```

## Default Value

By default, node certificates are rotated automatically every 90 days.

## References

1. https://docs.docker.com/engine/reference/commandline/swarm_update/#examples

## CIS Controls

**v8:**

- **5.2 Use Unique Passwords**
  - Use unique passwords for all enterprise assets. Best practice implementation includes, at a minimum, an 8-character password for accounts using MFA and a 14-character password for accounts not using MFA.

**v7:**

- **4.4 Use Unique Passwords**
  - Where multi-factor authentication is not supported (such as local administrator, root, or service accounts), accounts will use passwords that are unique to that system.