Re: [gentoo-user] Systemd and static network

["Canek Peláez Valdés" <caneko@gmail.com>]

On Thu, Jul 25, 2013 at 5:46 AM, Michael Hampicke <mh@hadt.biz> wrote:
> Howdy folks,
>
> currently I am migrating some servers to systemd, and I am wondering
> what's the best way to set up static networking. Until now, I always
> used dhcp + networkmanager (workstations, laptops).
>
> Some suggested creating your own network unit and manually start
> ifconfig/route or ip via ExecStart, some suggested Arch's netctl which
> seems to support static addresses and brings a systemd unit file.
>
> At the moment, following the KISS principle, I tend to a customized unit
> file.
>
> What do you use - and what are the benefits of your method?

I use the following unit in one of my servers:

# -------------------------------------------------------------------------------------------
[Unit]
Description=Static network service
After=local-fs.target
Documentation=man:ifconfig(8)
Documentation=man:route(8)

[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart=/bin/ifconfig <DEVICE> <IP> broadcast <BCAST> netmask <NETMASK> up
ExecStart=/bin/route add default gw <GW> <DEVICE>
# -------------------------------------------------------------------------------------------

Obviously, change the necessary parameters.

The benefit is that it doesn't get any more simple, I believe. If DHCP
is available and I don't want to use NetworkManager, I use the
following unit:

# -------------------------------------------------------------------------------------------
[Unit]
Description=DHCP on %I
After=basic.target

[Service]
ExecStartPre=/bin/ifconfig %I up
ExecStart=/sbin/dhcpcd -B %I

[Install]
WantedBy=multi-user.target
# -------------------------------------------------------------------------------------------

You can then enable the unit with:

systemctl enable dhcpcd@DEV.service

where DEV is enp0s0, or whatever funny name udev gives to your network
card. I think I got the unit from Arch, or maybe I wrote; I honestly
don't remember.

Regards.
-- 
Canek Peláez Valdés
Posgrado en Ciencia e Ingeniería de la Computación
Universidad Nacional Autónoma de México