[Cialug] Spontaneous Outbreak of Read-Only-ness

[Josh More]

That happens if there is a detected problem with a file system.  Linux
forces it to remount as read only to protect the data.

Do a deep fsck on those volumes and run drive tests using both smartctl and
the manufacturer's tools.

On Wed, Feb 24, 2016 at 11:24 AM, Todd Walton <tdwalton at gmail.com> wrote:

> I've had two weird read-only-izings happen in the past 24 hours.
>
> First, a RHEL 6 box: Found I couldn't write files to /tmp, even as root.
> Further poking revealed that I couldn't write to / either. 'cat
> /proc/mounts' said / was rw. Changing SELinux to permissive didn't help.
> Rebooted. All is well.
>
> Then, a CentOS 6 box: Tried to update root password. It took the password
> twice and then said "passwd: Authentication token manipulation error". I
> tried to mv the shadow file, thinking maybe I'd re-shadow passwd, but it
> wouldn't let me move it because... read-only filesystem. Again, 'cat
> /proc/mounts' showed that that should not have been the case. I rebooted
> and all is now well.
>
> I can't troubleshoot these further right now because I made the problem go
> away. But anybody seen this before?
>
> --
> Todd
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