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Type: Bug
Resolution: Done
Priority: Major
Fix Version/s: 4.20.z
Affects Version/s: 4.20.z
Component/s: Bare Metal Hardware Provisioning / cluster-baremetal-operator
Labels:
- triaged

Activity Type:
None
Blocked:
False
Blocked Reason:

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None

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None
Story Points:
2
Severity:
None
Regression:
None

Target Backport Versions:
None
Target Version:

4.20.z
Release Blocker:
None
Sprint:
Metal Platform 283, Metal Platform 284
sprint_count:
2

SFDC Cases Counter:
SFDC Cases Open:
SFDC Cases Links:

PX Impact Score:

Release Note Status:
Done
Release Note Type:
Bug Fix
Release Note Text:

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Before this update, the Security Context Constraints (SCC) additionally set `readOnlyRootFilesystem: true`. As a consequence, read-only file system errors occurred. With this release, by default, SSC sets the `readOnlyRootFilesystem` value to false. As a result, read-only file system errors do not occur.

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Before this update, the Security Context Constraints (SCC) additionally set `readOnlyRootFilesystem: true`. As a consequence, read-only file system errors occurred. With this release, by default, SSC sets the `readOnlyRootFilesystem` value to false. As a result, read-only file system errors do not occur.

Escape Reason:
None
Escape Impact:
None
Corrective Measures:
None
SDLC stage when should've been found:
None

Description of problem:

Security context constrains ( SCC ) part of OCP 4.20.11 enforces readOnlyRootFilesystem: true, which is only supported in OCP 4.21 and later. This causes Read-only file system errors. Refer the discussion in  https://issues.redhat.com/browse/OCPBUGS-65971 for more details.

Version-Release number of selected component (if applicable): 4.20.11

How reproducible:
If there is a SCC that enforces the above mentioned behavior, then we will always hit this issue.

Steps to Reproduce:
1. Deploy a cluster with above mentioned SCC present

Actual results:
Deployment fails as the machine-os-images init container part of metal3-image-customization fails with below error :
/bin/copy-metal: line 43: /coreos/coreos-aarch64.iso.sha256: Read-only file system

Expected results:
Deployment should succeed

depends on

OCPBUGS-65971 The machine-os-images container writes to /coreos during runtime which will fail for readOnlyRootFS

Closed

is related to

OCPBUGS-65971 The machine-os-images container writes to /coreos during runtime which will fail for readOnlyRootFS

Closed

relates to

OCPBUGS-76340 After upgrade to 4.20.10, ironic-proxy pods are in CrashLoopBackOff due to read-only file system

POST

links to

openshift/cluster-baremetal-operator#552: OCPBUGS-75933: Explicitly set ReadOnlyRootFilesystem to false for machine-os-images so that SCC don't end up enforcing it to true

Assignee:: Himanshu Roy

Reporter:: Himanshu Roy

QA Contact:: Jad Haj Yahya

Need Info From:: None

Votes:: 4 Vote for this issue

Watchers:: 17 Start watching this issue

Created:: 2026/02/05 5:29 AM

Updated:: 2026/03/02 10:34 AM

Resolved:: 2026/02/25 4:37 PM

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