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Full Discussion: Network interfaces error
Operating Systems Linux Network interfaces error Post 303006138 by RudiC on Friday 27th of October 2017 12:12:01 PM
Old 10-27-2017
Well, that might be the first step in a long and stony itinerary. You now need to investigate why it failed to start. Could the IFs be raised before? When did that stop functioning? Any system / systemd modifications ever since? Possible HW failures? Or, maybe a far fetched thought: does it fail because the IFs are already running?

Above is stating that the service can't raise the interface(s). Is that all or do you get more info?
When I issue the command
Code:
systemctl status networking.service
● networking.service - Raise network interfaces
   Loaded: loaded (/lib/systemd/system/networking.service; enabled; vendor preset: enabled)
   Active: active (exited) since Fri 2017-10-27 09:48:38 CEST; 8h ago
     Docs: man:interfaces(5)
. . .

you see IFs have been raised, but there's also a hint to read a man page. Therein, there are references to config files which you might want to double check (Are the right IFs listed? Do they exist?) and examples plus links for further reading like e.g. the Debian Reference manual.
 

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LEARN ABOUT POSIX

systemd-networkd-wait-online.service

SYSTEMD-NETWORKD-WAIT-ONLINE.SERVICE(8) 		     systemd-networkd.service			   SYSTEMD-NETWORKD-WAIT-ONLINE.SERVICE(8)

NAME

       systemd-networkd-wait-online.service, systemd-networkd-wait-online - Wait for network to come online

SYNOPSIS

       systemd-networkd-wait-online.service

       /lib/systemd/systemd-networkd-wait-online

DESCRIPTION

       systemd-networkd-wait-online is a one-shot system service that waits for the network to be configured. By default, it will wait for all
       links it is aware of and which are managed by systemd-networkd.service(8) to be fully configured or failed, and for at least one link to
       gain a carrier.

OPTIONS

       The following options are understood:

       -i, --interface=
	   Network interface to wait for before deciding if the system is online. This is useful when a system has several interfaces which will
	   be configured, but a particular one is necessary to access some network resources. This option may be used more than once to wait for
	   multiple network interfaces. When used, all other interfaces are ignored.

       --ignore=
	   Network interfaces to be ignored when deciding if the system is online. By default, only the loopback interface is ignored. This option
	   may be used more than once to ignore multiple network interfaces.

       --timeout=
	   Fail the service if the network is not online by the time the timeout elapses. A timeout of 0 disables the timeout. Defaults to 120
	   seconds.

SEE ALSO

       systemd(1), systemd-networkd.service(8)

systemd 237												   SYSTEMD-NETWORKD-WAIT-ONLINE.SERVICE(8)
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