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From: Vittorio Mori <vittorio.mori@gmail.com>
Date: Fri, 24 Jul 2020 13:07:46 +0200
Message-ID: <CAD4qdYAbhk86in4dP_e4P41_y-PM=PLt3OFT5iJDqnhui9i-wQ@mail.gmail.com>
Subject: Re: SAN boot/aoe support for init script (initramfs)
To: Tuan Hoang <tmhoang@linux.ibm.com>, alpine-user@lists.alpinelinux.org
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I actually hacked the init script by adding the following lines:

echo "AOE root mount"
        ifconfig eth0 up
        sleep 5
        modprobe aoe
        echo "AOE modprobed"
        sleep 2
        /usr/sbin/aoe-discover
        echo "AOE discover"
        sleep 2
        /usr/sbin/aoe-discover
        echo "AOE discover"
        sleep 1

Just before the

   mount ${rootfstype:+-t} ${rootfstype} \
                        -o ${KOPT_rootflags:-ro} \
                        ${KOPT_root#ZFS=} $sysroot

 stanza, leaving the init script basically untouched.

I also added the aoe.ko modules, and the ethernet card modules in the
initramfs-lts  file.

I tried it with two physical machines (an old Fujitsu Celsius W380, and a
T1700 Dell Precision), and they boot flawlessly.
All it's rather fast for being just an ancient gigabit ethernet card.

It's a very very ugly hack: I need to rewrite it properly : i.e.: loop
until the /dev/etherd devices are created, then boot - and some error
checks of course.
 Will do it today, maybe.





Il giorno ven 24 lug 2020 alle ore 12:46 Tuan Hoang <tmhoang@linux.ibm.com>
ha scritto:

> This sounds interesting. Guess I'd setup a VM acting as SAN and PXE
> server to feed storage disks to other VM booting with AOE.
>
> Then I could have a look into patching initramfs. Sounds like a plan.
>
> On 7/23/20 8:51 AM, Vittorio Mori wrote:
> > I am building a boot server with Alpine for my homeserver.
> >
> > I'd like to use aoe (ATA over ethernet) for my SAN, to boot the distro
> > from the SAN directly, with iPXE.
> >
> > I managed to make it work by adding the necessary files into the initram
> > (network modules, aoe modules, aoe utils), but the initramfs init script
> > always ends up to the emergency shell (, and I have to mount sysroot by
> > hand with three commands:
> >
> > ifconfig eth0 up
> > /usr/sbin/aoe-discover
> > mount /dev/ethernet/e0.0p3 /sysroot
> >
> > when I exit the emergency shell, the system boots regularly and
> > everything is fine.
> >
> > I tried to modify the init script, but it looks fairly complex and hard
> > to understand in some parts, and I can't make it work as expected.
> >
> > Can I get some hints on how to put those three commands into init ?
> >
> > Thanks.
> >
>

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<div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr">I actually hacked the in=
it script by adding the following lines:<br><br><div>echo &quot;AOE root mo=
unt&quot;</div><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 ifconfig eth0 up</div><div>=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 sleep 5</div><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 m=
odprobe aoe</div><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 echo &quot;AOE modprobed&=
quot;</div><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 sleep 2</div><div>=C2=A0 =C2=A0=
 =C2=A0 =C2=A0 /usr/sbin/aoe-discover</div><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0=
 echo &quot;AOE discover&quot;</div><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 sleep =
2</div><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 /usr/sbin/aoe-discover</div><div>=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 echo &quot;AOE discover&quot;</div><div>=C2=A0 =
=C2=A0 =C2=A0 =C2=A0 sleep 1<br><br>Just before the=C2=A0<br><br><div>=C2=
=A0 =C2=A0mount ${rootfstype:+-t} ${rootfstype} \</div><div>=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 -o ${=
KOPT_rootflags:-ro} \</div><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 ${KOPT_root#ZFS=3D} $sysroot</div=
></div><div><br>=C2=A0stanza, leaving the init script basically untouched.<=
br><br>I also added the aoe.ko modules, and the ethernet card modules in th=
e initramfs-lts=C2=A0 file.<br><br>I tried it with two physical machines (a=
n old Fujitsu=C2=A0Celsius W380, and a T1700 Dell Precision), and they=C2=
=A0boot=C2=A0flawlessly.<br>All it&#39;s rather fast for being just an anci=
ent gigabit ethernet card.<br><br></div><div>It&#39;s a very very ugly hack=
: I need to rewrite it properly : i.e.: loop until=C2=A0the /dev/etherd dev=
ices are created,=C2=A0then boot - and some error checks of course.<br>=C2=
=A0Will do it today,=C2=A0maybe.<br><br><br><br><br></div></div></div></div=
><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">Il gi=
orno ven 24 lug 2020 alle ore 12:46 Tuan Hoang &lt;<a href=3D"mailto:tmhoan=
g@linux.ibm.com">tmhoang@linux.ibm.com</a>&gt; ha scritto:<br></div><blockq=
uote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1p=
x solid rgb(204,204,204);padding-left:1ex">This sounds interesting. Guess I=
&#39;d setup a VM acting as SAN and PXE<br>
server to feed storage disks to other VM booting with AOE.<br>
<br>
Then I could have a look into patching initramfs. Sounds like a plan.<br>
<br>
On 7/23/20 8:51 AM, Vittorio Mori wrote:<br>
&gt; I am building a boot server with Alpine for my homeserver.<br>
&gt; <br>
&gt; I&#39;d like to use aoe (ATA over ethernet) for my SAN, to boot the di=
stro<br>
&gt; from the SAN directly, with iPXE.<br>
&gt; <br>
&gt; I managed to make it work by adding the necessary files into the initr=
am<br>
&gt; (network modules, aoe modules, aoe utils), but the initramfs init scri=
pt<br>
&gt; always ends up to the emergency shell (, and I have to mount sysroot b=
y<br>
&gt; hand with three commands:<br>
&gt; <br>
&gt; ifconfig eth0 up<br>
&gt; /usr/sbin/aoe-discover<br>
&gt; mount /dev/ethernet/e0.0p3 /sysroot<br>
&gt; <br>
&gt; when I exit the emergency shell, the system boots regularly and<br>
&gt; everything is fine.<br>
&gt; <br>
&gt; I tried to modify the init script, but it looks fairly complex and har=
d<br>
&gt; to understand in some parts, and I can&#39;t make it work as expected.=
<br>
&gt; <br>
&gt; Can I get some hints on how to put those three commands into init ?<br=
>
&gt; <br>
&gt; Thanks.<br>
&gt; <br>
</blockquote></div>

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