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systemd-stable/units/systemd-networkd-wait-online.service.in

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Add SPDX license headers to unit files
2017-11-18 17:35:03 +01:00
# SPDX-License-Identifier: LGPL-2.1+
#
networkd-wait-online: improve interoptability and enable by default To make sure we don't delay boot on systems where (some) network links are managed by someone else we don't block if something else has successfully brought up a link. We will still block until all links we are aware of that are managed by networkd have been configured, but if no such links exist, and someone else have configured a link sufficiently that it has a carrier, it may be that the link is ready so we should no longer block. Note that in all likelyhood the link is not ready (no addresses/routes configured), so whatever network managment daemon configured it should provide a similar wait-online service to block network-online.target until it is ready. The aim is to block as long as we know networking is not fully configured, but no longer. This will allow systemd-networkd-wait-online.service to be enabled on any system, even if we don't know whether networkd is the main/only network manager. Even in the case networking is fully configured by networkd, the default behavior may not be sufficient: if two links need to be configured, but the first is fully configured before the second one appears we will assume the network is up. To work around that, we allow specifying specific devices to wait for before considering the network up. This unit is enabled by default, just like systemd-networkd, but will only be pulled in if anyone pulls in network-online.target.
2014-04-23 17:42:55 +02:00
# This file is part of systemd.
#
# systemd is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
[Unit]
Description=Wait for Network to be Configured
Documentation=man:systemd-networkd-wait-online.service(8)
DefaultDependencies=no
Conflicts=shutdown.target
units: use Requires in systemd-networkd-wait-online.service (#6065) In the initial design, foobar-wait-online.service would have Requisite=foobar.service, so that foobar-wait-online.service could be enabled unconditionally, irrespective of whether foobar.service itself is enabled. Unfortunately this doesn't work too well: 1. the message about foobar-wait-online.service being skipped because of a "missing dependency" *looks* like an is problem. This is mostly cosmetic, but it also quite confusing. We generally don't want any messages of this type during default boot. 2. it is impossible to start and wait for the network in an implementation-agnostic way: systemctl start network-online.target, or Wants/After=network-online.target in a unit don't work because pulling in network-online.target pulls in foobar-wait-online.service, but it in turn does not pull in foobar.service. During startup, foobar.service is pulled in by multi-user.target, but not in a smaller transaction which does not include multi-user.target. This change means that *-wait-online.service should be installed through presets, so that it can be enabled/disabled at will by the administrator. Our own systemd-networkd-wait-online.service does this already, and similar change has been requested for NetworkManager-wait-online.service (https://bugzilla.redhat.com/show_bug.cgi?id=1455704). This change should by mostly backwards-compatible, unless somebody has some wait-online.service enabled, without having the corresponding network implementation enabled, and they are relying on it not being started. I think that's relatively unlikely because of issue 1. above, and I'm not aware of this being the default in any distro. And being able to start the network in an implementation-agnostic way is pretty important, see https://bugzilla.redhat.com/show_bug.cgi?id=1452866.
2017-07-03 11:05:20 -04:00
Requires=systemd-networkd.service
networkd-wait-online: improve interoptability and enable by default To make sure we don't delay boot on systems where (some) network links are managed by someone else we don't block if something else has successfully brought up a link. We will still block until all links we are aware of that are managed by networkd have been configured, but if no such links exist, and someone else have configured a link sufficiently that it has a carrier, it may be that the link is ready so we should no longer block. Note that in all likelyhood the link is not ready (no addresses/routes configured), so whatever network managment daemon configured it should provide a similar wait-online service to block network-online.target until it is ready. The aim is to block as long as we know networking is not fully configured, but no longer. This will allow systemd-networkd-wait-online.service to be enabled on any system, even if we don't know whether networkd is the main/only network manager. Even in the case networking is fully configured by networkd, the default behavior may not be sufficient: if two links need to be configured, but the first is fully configured before the second one appears we will assume the network is up. To work around that, we allow specifying specific devices to wait for before considering the network up. This unit is enabled by default, just like systemd-networkd, but will only be pulled in if anyone pulls in network-online.target.
2014-04-23 17:42:55 +02:00
After=systemd-networkd.service
units: add missing Before=shutdown.target for units which it Conflicts There's a few services missing this ordering. Also remove a duplicate Conflicts=shutdown.target from systemd-volatile-root.service.
2017-09-25 12:10:38 +01:00
Before=network-online.target shutdown.target
networkd-wait-online: improve interoptability and enable by default To make sure we don't delay boot on systems where (some) network links are managed by someone else we don't block if something else has successfully brought up a link. We will still block until all links we are aware of that are managed by networkd have been configured, but if no such links exist, and someone else have configured a link sufficiently that it has a carrier, it may be that the link is ready so we should no longer block. Note that in all likelyhood the link is not ready (no addresses/routes configured), so whatever network managment daemon configured it should provide a similar wait-online service to block network-online.target until it is ready. The aim is to block as long as we know networking is not fully configured, but no longer. This will allow systemd-networkd-wait-online.service to be enabled on any system, even if we don't know whether networkd is the main/only network manager. Even in the case networking is fully configured by networkd, the default behavior may not be sufficient: if two links need to be configured, but the first is fully configured before the second one appears we will assume the network is up. To work around that, we allow specifying specific devices to wait for before considering the network up. This unit is enabled by default, just like systemd-networkd, but will only be pulled in if anyone pulls in network-online.target.
2014-04-23 17:42:55 +02:00
[Service]
Type=oneshot
ExecStart=@rootlibexecdir@/systemd-networkd-wait-online
RemainAfterExit=yes
[Install]
WantedBy=network-online.target
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