kubernetes/kops · error

error setting file owner/group for %q: %v

Error message

error setting file owner/group for %q: %v

What it means

After resolving user and group IDs, EnsureFileOwner calls os.Lchown to apply the new ownership to the file. If the kernel rejects the chown (permission or filesystem error), the raw error is wrapped as 'error setting file owner/group'. Unlike the lookup errors, this indicates the IDs were valid but the operation itself was denied or failed.

Source

Thrown at upup/pkg/fi/files_owner.go:71

	if groupName != "" {
		group, err := LookupGroup(groupName)
		if err != nil {
			return changed, fmt.Errorf("error looking up group %q: %v", groupName, err)
		}
		if group == nil {
			return changed, fmt.Errorf("group %q not found", groupName)
		}
		groupID = group.Gid
	}

	if actualUserID == userID && actualGroupID == groupID {
		return changed, nil
	}

	klog.Infof("Changing file owner/group for %q to %s:%s", destPath, owner, groupName)
	err = os.Lchown(destPath, userID, groupID)
	if err != nil {
		return changed, fmt.Errorf("error setting file owner/group for %q: %v", destPath, err)
	}
	changed = true

	return changed, nil
}

View on GitHub (pinned to 4c8573c808)

Solutions

1. Re-run the command with elevated privileges (sudo / run as root)
2. Ensure the process user owns the file or is a member of the target group
3. Check filesystem is writable and does not block chown (mount options, immutable flag: `lsattr`, `chattr -i`)
4. Verify with `id` which users/groups the process can assume

Example fix

// before
$ kops update cluster ...   # EPERM on chown
// after
$ sudo kops update cluster ...

if os.Geteuid() != 0 { return fmt.Errorf("chown of %q requires root; re-run with elevated privileges", path) }

if err != nil { var perr *fs.PathError; if errors.As(err, &perr) && errors.Is(perr.Err, syscall.EPERM) { return fmt.Errorf("insufficient privileges to chown %s; run as root", path) } return err }

When it happens

Trigger: os.Lchown(destPath, userID, groupID) returns an error during RenderLocal — typically EPERM/EACCES because the process is not root and not the file's current owner, or the filesystem disallows chown (some NFS/network mounts, read-only fs).

Common situations: Running `kops create/replace` asset rendering without sudo when targeting root-owned files; read-only or root-squashed NFS mount; container running as non-root user; immutable file attribute set.

Related errors

• creating directories %q: %w
• unable to read snippet: %s, error: %s
• unable to read template: %s, error: %s
• error creating file %q: %v
• creating directory %q: %w

AI-assisted analysis of kubernetes/kops@4c8573c808 (2026-09-05). Data as JSON: /api/errors/68c1ca9f060aec84. Report an issue: GitHub.