xfs_growfs tips — authorized XFS filesystem grow literacy

Snapshot

Tip checklist (authorized only)

1. Confirm you may run xfs_growfs on the lab host (syllabus box you own; grow needs root on the mounted XFS).
2. Prefer documenting who / why / ticket before any XFS grow — never grow production mounts without change control.
3. Record short factual notes; quote short Evidence (mount path + size — never secrets).
4. Optional: partition grow peer → growpart-tips.
5. Optional: capacity peer → df-disk-tips.
6. Prefer disposable lab VMs for xfs_growfs drills; quote non-secret labels afterward as Evidence.
7. Prefer xfs_info / xfs_growfs -n read-back before authorized grow — refuse unauthorized foreign-mount cookbooks.
8. Stop at literacy — no attack or unauthorized disk-bypass cookbooks.

Allowed framing

• Classroom labs reviewing xfs_info /labmnt then authorized xfs_growfs /labmnt on disposable hosts.
• Binding short factual notes as Evidence (mount path + size — no secrets).
• Documenting expected vs observed XFS geometry for authorized notes.
• Comparing xfs_growfs ↔ growpart / resize2fs / df / lsblk peer tip pages under one binder.
• Testing syllabus-approved lab XFS grow only when change control authorizes that drill on lab resources.

Scope we will not cover

• No crack/pirate/keygen via xfs_growfs.
• No intentional unauthorized XFS grow against foreign mounts.
• No secret-theft or credential harvesting against hosts you do not own.
• No cookbooks that use xfs_growfs as an attack step against production without authorization.
• No xfs_growfs framed as a disk-bypass against systems you do not own.

Beginner path (authorized only)

1. Obtain one syllabus-approved disposable lab host with xfsprogs available and an XFS lab mount.
2. Prefer documenting current size via df-disk-tips / xfs_info before any grow.
3. With authorization, ensure the underlying partition/LV already grew (growpart-tips, lvextend-tips), then run xfs_growfs <labmnt>; quote selected mount/size labels as Evidence.
4. Optional: peer tip pages above when the syllabus asks.
5. Stop at literacy — no attack or unauthorized disk-bypass cookbooks.

Practical notes for authorized labs

• xfs_growfs grows a mounted XFS — keep Evidence labels distinct from resize2fs-tips (ext family).
• Pair with growpart-tips / lvextend-tips when the syllabus zooms on underlying block grow first.
• xfs_info / xfs_growfs -n are great read-only drills — document selected geometry without dumping unrelated privileged state.
• Prefer documenting mount paths and sizes the syllabus authorized.
• Never commit xfs_info dumps with secrets or proprietary disk serials to git — even for labs.

FAQ-aligned refusals (quick)

• Foreign-mount XFS grow → refuse.
• Unauthorized disk-bypass / hostile-grow attack cookbooks → refuse.
• Attack/credential-theft framing → refuse.

For legal, authorized and educational use only.

FAQ

Sources