On Wed, 23 Sep 2020 at 04:33, Carlos Lopez <clopmz@xxxxxxxxxxx> wrote:
> Hi all,
>
>
> With SystemD, how can I make certain service dependent on certain network
> interfaces being up?
>
> For example, I have an 802.1ad bond interface I need to wait on for being
> up (this interface has no ip address assigned, it is used to capture
> networks packets with a tcpdump’s script). Every time this service fails
> because bond interface is not up.
>
>
>
> I have configured the service as:
>
>
> [Unit]
>
> Description=tcpdump capture script
>
> After=network.target
>
> Wants=network-online.target
>
>
>
> But it doesn’t work …. Any tip or trick?
>
>
>
So the network just calls the scripts and exits so they can take a while to
get working. I think this website covers what you want to do
https://unix.stackexchange.com/questions/257888/systemd-wait-for-network-interface-to-be-up-before-running-service
systemctl list-units --no-pager | grep subsystem-net
Then look for the device which matches the one you are listening to. Change
the After=network.target to
BindsTo=sys-devices-virtual-net-<device>.device
After=sys-devices-virtual-net-<device>.device
where <device> is the interface you found (aka eth2, br9, bond0 etc)
> My host is CentOS8 x86_64.
>
>
> Regards,
> C. L. Martinez
>
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--
Stephen J Smoogen.
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