[systemd-devel] Dealing with read-only rootfs

[Ryan Gonzalez]

The ostree docs have a good description of what to do here: 
https://ostree.readthedocs.io/en/latest/manual/adapting-existing/

In particular, see the "System layout" section.


On June 17, 2018 12:03:22 PM Jérémy Rosen <jeremy.rosen at smile.fr> wrote:

> Hello everybody
>
> I am trying to understand the recommanded way to deal with read-only
> rootfs...
>
> my understanding is that (slightly simplified)
> * /run must be a tmpfs
> * /var must be writable, and will usually be persistant (can be a tmpfs too)
> * everything else can be read-only
>
> My problem comes with populating an empty /var. There seems to be hints
> to a systemd-provided mechanism to do that, but I can't find any
> documentation for it
>
> Apparently, tmpfiles.d should copy the content from /usr/share/factory
> to /var when /var is empty, but I can't find what actually implements that
>
> * is it dynamically added in /run ?
> * is it just a recommanded way, and I have to implemented myself ? if
> yes, is the directory /usr/share/factory documented anywhere ?
> * what qualifies as "empty /var" ? (this is mostly about being robust to
> power-loss during the copying of /var)
>
> Any hints would be welcomed
>
> thx
> Jeremy
>
>
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