Re: overlayfs - vaild to mount mergedir over lowerdir?

[Mark Corbin <mcorbin@lunarenergy.com>]

On Thu, 30 Oct 2025 at 17:54, Amir Goldstein <amir73il@gmail.com> wrote:
>
> On Thu, Oct 30, 2025 at 6:26 PM Mark Corbin <mcorbin@lunarenergy.com> wrote:
> >
> > Hello
> >
> > Is it valid/safe to mount an overlayfs mergedir over the lowerdir?
> >
> > The Yocto/OE mount-copybind script does exactly that:
> >
> > overlay on /srv type overlay
> > (rw,relatime,lowerdir=/srv,upperdir=/var/volatile/srv,workdir=/var/vola
> > tile/.srv-work)
> >
> > I wanted to do something similar with a read-only /etc where the
> > merged /etc is mounted on /etc, e.g.
> > mount -v -t overlay overlay -o
> > lowerdir=/etc,upperdir=/data/etc,workdir=/data/etc-work /etc
> >
> > Any issues or recommendations?
>
> None that I can think of.
> Overlayfs has no problem with that.
> It gets a reference to the lowerdir object at mount time *before*
> attaching itself to the mount point and that's it.
>
> Thanks,
> Amir.

Thanks Amir.

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Mark Corbin
Senior Software Engineer  |  lunarenergy.com  |  LinkedIn  |  Instagram

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