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From: Jerome Marc <marcgruselle@gmail.com>
Date: Tue, 9 Dec 2025 10:33:43 +0100
Message-ID: <CAD1Ag0wz=DcL19yE3JLfKH9fsc4wObYpmh5CDMJ72eN08cDzwQ@mail.gmail.com>
Subject: Re: running containers (Podman or Docker) in diskless mode ?
To: Guido Trotter <ultrotter@debian.org>
Cc: ~alpine/users@lists.alpinelinux.org
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I need an image. There is no problem running the process inside the
container in a read-only root. There are options for that. But even if the
guest is read-only, it doesn't mean that the container host can use a ro
filesystem. I guess that lxc could be more flexible for that.

Le mar. 9 d=C3=A9c. 2025 =C3=A0 08:24, Guido Trotter <ultrotter@debian.org>=
 a =C3=A9crit :

> If you're running just a container it should depend on what process you
> run in the container... You wouldn't need to run "the os" necessarily, so
> using read only would work if your process never writes to disk. In some
> cases you might not need an os image at all.
>
> On Tue, 9 Dec 2025, 01:26 Jerome Marc, <marcgruselle@gmail.com> wrote:
>
>> Hello,
>>
>> I would like to deploy a small container on my RPI.
>> The OS is running in diskless mode (lbu) and I have a quite large data
>> partition which is read-only.
>> I use the data partition to store large stuff like node libraries.
>>
>> By the way I was expecting to be able to start a container from this
>> read-only partition. As the container is immutable I don't see any reaso=
n
>> to make the partition rw, except of course when updating the docker imag=
e.
>> So does anyone tried (and hopefully succeeded) to run a container that w=
ay ?
>>
>> Thank you.
>>
>>
>>

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<div dir=3D"ltr">I need an image. There is no problem running the process i=
nside the container in a read-only root. There are options for that. But ev=
en if the guest is read-only, it doesn&#39;t mean that=C2=A0the container h=
ost can use a ro filesystem. I guess that lxc could be more flexible for th=
at.</div><br><div class=3D"gmail_quote gmail_quote_container"><div dir=3D"l=
tr" class=3D"gmail_attr">Le=C2=A0mar. 9 d=C3=A9c. 2025 =C3=A0=C2=A008:24, G=
uido Trotter &lt;<a href=3D"mailto:ultrotter@debian.org">ultrotter@debian.o=
rg</a>&gt; a =C3=A9crit=C2=A0:<br></div><blockquote class=3D"gmail_quote" s=
tyle=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);pad=
ding-left:1ex"><div dir=3D"auto">If you&#39;re running just a container it =
should depend on what process you run in the container... You wouldn&#39;t =
need to run &quot;the os&quot; necessarily, so using read only would work i=
f your process never writes to disk. In some cases you might not need an os=
 image at all.</div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=
=3D"gmail_attr">On Tue, 9 Dec 2025, 01:26 Jerome Marc, &lt;<a href=3D"mailt=
o:marcgruselle@gmail.com" target=3D"_blank">marcgruselle@gmail.com</a>&gt; =
wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0=
px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=
=3D"ltr">Hello,<br><div><br></div><div>I would like to deploy a small conta=
iner on my RPI.</div><div>The=C2=A0OS is running in diskless mode (lbu) and=
 I have a quite=C2=A0large data partition which is read-only.</div><div>I u=
se the data partition to store large stuff=C2=A0like node libraries.</div><=
div><br></div><div>By the way I was expecting to be able to start a contain=
er from this read-only partition. As the container is immutable I don&#39;t=
 see any reason to make the partition rw, except of course when updating th=
e docker image. So does anyone tried (and hopefully succeeded) to run a con=
tainer that way ?</div><div><br></div><div>Thank you.</div><div><br></div><=
div><br></div></div>
</blockquote></div>
</blockquote></div>

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