ceph-s3 SKILL.md skillA
ceph-s3 from air-gapped/skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add air-gapped/skills/ceph-s3@git:20261027.61472c6Pins git:20261027.61472c6 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- air-gapped/skills
- Path
.claude/skills/ceph-s3/SKILL.md- Versions recorded
- 12
- Latest version
- git:20261027.61472c6, committed Oct 27, 2026
- First version recorded
- Sep 22, 2026
- Size
- 8,057 bytes
- Repository stars
- 6
- License
- MIT
Run Ceph RGW as an S3 endpoint under Rook (CephObjectStore, CephObjectStoreUser, ObjectBucketClaim, COSI, CephBucketTopic, multisite realms/zones). Core knowledge: the 19.2.6 / 20.2.4 RGW security fixes and their fallout (SigV4 hardening rejecting presigned PUTs and RGW's own multisite forwarding; rgw_sigv4_insecure + rgw_s3_client_max_sig_ver), AWS SDK default checksums vs RGW (CRC64NVME only in Tentacle), bucket index sharding and large-omap warnings, Tentacle's two-phase reshard, RGW…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# ceph-s3 Defaults read from `src/common/options/rgw.yaml.in` at v19.2.6 and v20.2.4; Rook docs at v1.20.7 and master; tracker and ceph-users as cited. Verified **2026-09-23**. Focus argument → section: `security` → §19.2.6 / 20.2.4 fixes; `compat` → §AWS SDK checksums and §Tentacle S3 behaviour changes; `sharding` → §Bucket index and resharding; `multisite` → SigV4 item 2, §Multisite sync status and the Multisite row of §Rook object CRDs; `rook` → §Rook object CRDs. No argument: match the symptom to a section heading. ## 19.2.6 / 20.2.4 RGW security fixes and their fallout | CVE | What | Fixed | |---|---|---| | CVE-2026-54330 | SigV4 did not check that added `x-amz-*` headers on a presigned request were signed | 19.2.6, 20.2.4 | | CVE-2026-39944 | STS session-token fields (`is_admin`, account type) could be bit-flipped → RGW admin | 19.2.6, 20.2.4 | | CVE-2025-30156 | CephX (cluster-wide, not RGW-only) — see rook-ceph-best-practices | 19.2.6, 20.2.4 | The SigV4 fix breaks two things: 1. **Clients sending an unsigned `Content-Type` or `x-amz-content-sha256`** (boto3 presigned PUTs with a content type, aws-sdk-php, minio-go — so …
Read the whole file at its exact version.
How to install
mdr add air-gapped/skills/ceph-s3@sha256:cfc880a48d816e9cThe line at the top of this page pins the label git:20261027.61472c6, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_lexvnip47mlyfryj)
7 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 12 versions of this file, between Sep 22, 2026 and Oct 27, 2026, about one every 3 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261027.61472c6 latest | 2026-10-27 | 61472c6 | 8,057 B | A | view · diff |
| git:20261027.70a257a | 2026-10-27 | 70a257a | 8,103 B | A | view · diff |
| git:20261027.a491242 | 2026-10-27 | a491242 | 8,041 B | A | view · diff |
| git:20261027.e88f0f3 | 2026-10-27 | e88f0f3 | 8,090 B | A | view · diff |
| git:20261027.697dffc | 2026-10-27 | 697dffc | 8,069 B | A | view · diff |
| git:20261003.d3b6237 | 2026-10-03 | d3b6237 | 7,588 B | A | view · diff |
| git:20261003.6b7bb91 | 2026-10-03 | 6b7bb91 | 7,061 B | A | view · diff |
| git:20260922.b895457 | 2026-09-22 | b895457 | 6,718 B | A | view · diff |
| git:20260922.f2b5f63 | 2026-09-22 | f2b5f63 | 6,522 B | A | view · diff |
| git:20260922.7cd165c | 2026-09-22 | 7cd165c | 6,557 B | A | view · diff |
| git:20260922.2ecf55f | 2026-09-22 | 2ecf55f | 6,564 B | A | view · diff |
| git:20260922.ffb08a5 | 2026-09-22 | ffb08a5 | 6,760 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (8057 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
air-gapped/skills · 6 stars · license MIT · pushed 2026-11-04 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_lexvnip47mlyfryj GET https://markdownregistry.com/api/v1/resolve?ref=air-gapped/skills/ceph-s3 GET https://markdownregistry.com/api/v1/blob/cfc880a48d816e9c313396f7d02425d887d7d6329bffe3db2889587f8c7261d8
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.