Discussion:
systemd-networkd: How to configure network with environment variables?
(too old to reply)
Lennart Poettering
2021-04-23 08:00:32 UTC
Permalink
Dear systemd folks,
Due to historical reasons, in our environment we have a configuration file
$ more /etc/local/mxhost.conf
MX_NETDEV=net02
MX_IPADDR=141.14.18.X
Then a custom service unit `network.service` [1] configures the network with
the configuration file as environment file.
[Unit]
Description=Network Connectivity
DefaultDependencies=no
[Service]
EnvironmentFile=/etc/local/mxhost.conf
Type=oneshot
RemainAfterExit=yes
ExecStart=/usr/sbin/mxnetctl start
ExecStart=/sbin/ip addr add ${MX_IPADDR}/20 broadcast 141.14.31.255 dev
${MX_NETDEV}
ExecStart=/sbin/ip link set up dev ${MX_NETDEV}
ExecStart=/sbin/ip route add default via 141.14.16.X
ExecStop=/sbin/ip addr del ${MX_IPADDR}/20 dev ${MX_NETDEV}
StandardOutput=syslog
[Install]
WantedBy=network.target
Wanting to use systemd-network but keeping local device configuration in
`/etc/local` is there an easy way? systemd.network(5) does not say anything
about, that environment variables could be used.
If that does not work, do you have another suggestion? Possible, but not
No, networkd has no support for that.
1. Use a generator to create .network files from `/etc/local/mxhost.conf`.
Yes, that should be really easy to implement, i.e. just write a small
shell script, that sources that config files and outputs the .network
file into /run somewhere via a here document, and then run this script
during boot, and order it before networkd, so that the conversion is
completed on each boot, before networkd is run.

Lennart

--
Lennart Poettering, Berlin
Nicholas Labich
2021-04-23 13:09:37 UTC
Permalink
On Fri, Apr 23, 2021 at 10:00:32 +0200 Lennart Poettering
Post by Lennart Poettering
Dear systemd folks,
Due to historical reasons, in our environment we have a configuration file
$ more /etc/local/mxhost.conf
MX_NETDEV=net02
MX_IPADDR=141.14.18.X
Then a custom service unit `network.service` [1] configures the network with
the configuration file as environment file.
[Unit]
Description=Network Connectivity
DefaultDependencies=no
[Service]
EnvironmentFile=/etc/local/mxhost.conf
Type=oneshot
RemainAfterExit=yes
ExecStart=/usr/sbin/mxnetctl start
ExecStart=/sbin/ip addr add ${MX_IPADDR}/20 broadcast 141.14.31.255 dev
${MX_NETDEV}
ExecStart=/sbin/ip link set up dev ${MX_NETDEV}
ExecStart=/sbin/ip route add default via 141.14.16.X
ExecStop=/sbin/ip addr del ${MX_IPADDR}/20 dev ${MX_NETDEV}
StandardOutput=syslog
[Install]
WantedBy=network.target
Wanting to use systemd-network but keeping local device configuration in
`/etc/local` is there an easy way? systemd.network(5) does not say anything
about, that environment variables could be used.
If that does not work, do you have another suggestion? Possible, but not
No, networkd has no support for that.
1. Use a generator to create .network files from `/etc/local/mxhost.conf`.
Yes, that should be really easy to implement, i.e. just write a small
shell script, that sources that config files and outputs the .network
file into /run somewhere via a here document, and then run this script
during boot, and order it before networkd, so that the conversion is
completed on each boot, before networkd is run.
Lennart
This would be a nice feature in networkd. Another use case would be to
supply a WireGuard PrivateKeyFile via the CREDENTIALS_DIRECTORY from a
container host. I'm not sure that this can be implemented with a
generator (please correct me if I'm wrong).

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