[arch-releng] [RFC][PATCH] [configs/releng] Use systemd-networkd instead of dhcpcd

[Gerardo Exequiel Pozzi]

On 02/25/2014 10:10 PM, Tom Gundersen wrote:
> On Wed, Feb 26, 2014 at 1:43 AM, Gerardo Exequiel Pozzi
> <vmlinuz386 at yahoo.com.ar> wrote:
>> Signed-off-by: Gerardo Exequiel Pozzi <vmlinuz386 at yahoo.com.ar>
>> ---
>>  .../releng/root-image/etc/systemd/network/dhcp-on-ethernet.network   | 5 +++++
>>  configs/releng/root-image/etc/udev/rules.d/81-dhcpcd.rules           | 1 -
>>  configs/releng/root-image/root/customize_root_image.sh               | 2 +-
>>  3 files changed, 6 insertions(+), 2 deletions(-)
>>  create mode 100644 configs/releng/root-image/etc/systemd/network/dhcp-on-ethernet.network
>>  delete mode 100644 configs/releng/root-image/etc/udev/rules.d/81-dhcpcd.rules
>>
>> diff --git a/configs/releng/root-image/etc/systemd/network/dhcp-on-ethernet.network b/configs/releng/root-image/etc/systemd/network/dhcp-on-ethernet.network
>> new file mode 100644
>> index 0000000..aec1849
>> --- /dev/null
>> +++ b/configs/releng/root-image/etc/systemd/network/dhcp-on-ethernet.network
>> @@ -0,0 +1,5 @@
>> +[Match]
>> +Name=en*
>> +
>> +[Network]
>> +DHCP=yes
>> diff --git a/configs/releng/root-image/etc/udev/rules.d/81-dhcpcd.rules b/configs/releng/root-image/etc/udev/rules.d/81-dhcpcd.rules
>> deleted file mode 100644
>> index 1c4053c..0000000
>> --- a/configs/releng/root-image/etc/udev/rules.d/81-dhcpcd.rules
>> +++ /dev/null
>> @@ -1 +0,0 @@
>> -ACTION=="add", SUBSYSTEM=="net", ENV{INTERFACE}=="en*|eth*", ENV{SYSTEMD_WANTS}="dhcpcd@$name.service"
>> diff --git a/configs/releng/root-image/root/customize_root_image.sh b/configs/releng/root-image/root/customize_root_image.sh
>> index 9c85453..3e01e2d 100755
>> --- a/configs/releng/root-image/root/customize_root_image.sh
>> +++ b/configs/releng/root-image/root/customize_root_image.sh
>> @@ -18,5 +18,5 @@ chmod 440 /etc/sudoers.d/g_wheel
>>  sed -i "s/#Server/Server/g" /etc/pacman.d/mirrorlist
>>  sed -i 's/#\(Storage=\)auto/\1volatile/' /etc/systemd/journald.conf
>>
>> -systemctl enable pacman-init.service choose-mirror.service
>> +systemctl enable pacman-init.service choose-mirror.service systemd-networkd.service
>>  systemctl set-default multi-user.target
> 
> 
> Please also symlink /etc/resolv.conf to
> /run/systemd/network/resolv.conf (I need to document that better,
> sorry about that). Otherwise, (surprisingly ;-) ) +1 from me.
> 
> Cheers,
> 
> Tom
> 

Oki doki! Thanks for your great work!

The issue here is when booting via PXE... The initcpio hook, writes on
(append) etc/resolv.conf. Now, I think that I need to hack, and write to
/run/systemd/network/resolv.conf instead.

* Under PXE scenario: systemd-networkd will not be used because
interface rename will fail (already UP from initramfs as eth) then
/run/systemd/network/resolv.conf is untouched from systemd-network.

* Under non-PXE scenario: /run/systemd/network/resolv.conf will be
touched only by systemd-network.

Also I think that can be a good idea for PXE scenario if-down-eth0, on
initramfs as last step, then in this case, rename does work and dhcpcd
is requested again but from systemd-networkd on real-root-fs.


-- 
Gerardo Exequiel Pozzi
\cos^2\alpha + \sin^2\alpha = 1

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