Am Mittwoch, dem 21.04.2021 um 14:24 -0400 schrieb Bruce A. Johnson:
> Is there a correct way to obtain information about the DHCP lease
> received by systemd-networkd's DHCP client functionality? It was easy
> enough to find SERVER_ADDRESS in /var/run/systemd/netif/leases/4, but
> there is a big fat warning stamped at the top of the file:
>
> > # This is private data. Do not parse.
> I'd like to be able to make a widget that can tell me which DHCP server
> issued my lease, how much more time I have, etc., mainly because I want
> to be able to ping something that is known to be on the network. I'm
> dealing with a lazy sysadmin who doesn't want to put a gateway on this
> private network, I haven't found a solution using the CLI tools.
>
> Thanks in advance.
Hi Bruce,
IMHO "having a lease" is not a good metric to determine if you can
access something.
I would suggest something along this line:
--- /etc/systemd/system/internal-network-accessable.target
[Unit]
Description=Internal System Accessable
---
--- /etc/systemd/system/check-if-internal-system-is-accessable.service
[Unit]
Description=Check if internal system can be reached
[Service]
ExecStart=/usr/local/bin/check-if-internal-system-is-accessable.sh
Restart=always
[Install]
WantedBy=multi-user.target
---
--- /usr/local/bin/check-if-internal-system-is-accessable.sh
#!/usr/bin/bash
while :; do
if wget -q --spider $INTERNAL_RESOURCE; then
systemctl start internal-network-accessable.target
else
systemctl stop internal-network-accessable.target
fi
sleep 600
done
---
Than you can check just the status of the .target. You may need to
tweak the lifeness probe, YMMV.
Also in sd-networkd you can configure a .network to never loose its
lease, see man:systemd.network → KeepConfiguration=
HTH
Silvio
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