fuck systemd-networkd-wait-online.service: "start job is running for wait for network to be configured"

fuck systemd-networkd-wait-online.service: “start job is running for wait for network to be configured”

When using Ubuntu, I have encountered this kind of situation many times.

It looks like the image shown.

​image​

After booting into the system, you can see through systemd-analyze blame​ that the startup time of systemd-networkd-wait-online.service reaches several minutes.

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r00t@f4keserver:~$ sudo systemctl status systemd-networkd-wait-online.service
● systemd-networkd-wait-online.service - Wait for Network to be Configured
     Loaded: loaded (/lib/systemd/system/systemd-networkd-wait-online.service; enabled-runtime; vendor preset: disabled)
     Active: active (exited) since Mon 2024-01-15 03:36:01 UTC; 12min ago
       Docs: man:systemd-networkd-wait-online.service(8)
   Main PID: 624 (code=exited, status=0/SUCCESS)
        CPU: 4ms

Jan 15 03:35:56 f4keserver systemd[1]: Starting Wait for Network to be Configured...
Jan 15 03:36:01 f4keserver systemd-networkd-wait-online[624]: managing: ens33
Jan 15 03:36:01 f4keserver systemd[1]: Finished Wait for Network to be Configured.

r00t@f4keserver:~$ cat /lib/systemd/system/systemd-networkd-wait-online.service
#  SPDX-License-Identifier: LGPL-2.1-or-later
#
#  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
Requires=systemd-networkd.service
After=systemd-networkd.service
Before=network-online.target shutdown.target

[Service]
Type=oneshot
ExecStart=/lib/systemd/systemd-networkd-wait-online
RemainAfterExit=yes

[Install]
WantedBy=network-online.target

You can see that there is a timeout​ parameter for /lib/systemd/systemd-networkd-wait-online​. This means you can add the argument --timeout=1​ in the corresponding systemd-networkd-wait-online service file, indicating a timeout of 1 second.

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r00t@f4keserver:~$ /lib/systemd/systemd-networkd-wait-online --help
systemd-networkd-wait-online [OPTIONS...]

Block until network is configured.

  -h --help                 Show this help
     --version              Print version string
  -q --quiet                Do not show status information
  -i --interface=INTERFACE[:MIN_OPERSTATE[:MAX_OPERSTATE]]
                            Block until at least these interfaces have appeared
     --ignore=INTERFACE     Don't take these interfaces into account
  -o --operational-state=MIN_OPERSTATE[:MAX_OPERSTATE]
                            Required operational state
  -4 --ipv4                 Requires at least one IPv4 address
  -6 --ipv6                 Requires at least one IPv6 address
     --any                  Wait until at least one of the interfaces is online
     --timeout=SECS         Maximum time to wait for network connectivity

See the systemd-networkd-wait-online.service(8) man page for details.

look like this

/lib/systemd/system/systemd-networkd-wait-online.service

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[Unit]
Description=Wait for Network to be Configured
Documentation=man:systemd-networkd-wait-online.service(8)
DefaultDependencies=no
Conflicts=shutdown.target
Requires=systemd-networkd.service
After=systemd-networkd.service
Before=network-online.target shutdown.target

[Service]
Type=oneshot
ExecStart=/lib/systemd/systemd-networkd-wait-online --timeout=1
RemainAfterExit=yes

[Install]
WantedBy=network-online.target