[systemd-devel] Question: systemd-resolved.service delayed almost 90s start after systemd-sysctl.service

[Alien Kong]

Hi, Paul

Thank you for your reply.

This is a low-probability, sporadic problem. Currently, there is no
`journalctl -b` information with `debug` on the command line.

The unit information of the two services is as follows:
1. systemctl cat systemd-resolved

# /usr/lib/systemd/system/systemd-resolved.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=Network Name Resolution
Documentation=man:systemd-resolved.service(8)
Documentation=man:org.freedesktop.resolve1(5)
Documentation=
https://www.freedesktop.org/wiki/Software/systemd/writing-network-configuration-managers
Documentation=
https://www.freedesktop.org/wiki/Software/systemd/writing-resolver-clients

DefaultDependencies=no
After=systemd-sysctl.service systemd-sysusers.service
Before=sysinit.target network.target nss-lookup.target shutdown.target
initrd-switch-root.target
Conflicts=shutdown.target initrd-switch-root.target
Wants=nss-lookup.target

[Service]
AmbientCapabilities=CAP_SETPCAP CAP_NET_RAW CAP_NET_BIND_SERVICE
BusName=org.freedesktop.resolve1
CapabilityBoundingSet=CAP_SETPCAP CAP_NET_RAW CAP_NET_BIND_SERVICE
ExecStart=!!/usr/lib/systemd/systemd-resolved
LockPersonality=yes
MemoryDenyWriteExecute=yes
NoNewPrivileges=yes
PrivateDevices=yes
PrivateTmp=yes
ProtectClock=yes
ProtectControlGroups=yes
ProtectHome=yes
ProtectKernelLogs=yes
ProtectKernelModules=yes
ProtectKernelTunables=yes
ProtectSystem=strict
Restart=always
RestartSec=0
RestrictAddressFamilies=AF_UNIX AF_NETLINK AF_INET AF_INET6
RestrictNamespaces=yes
RestrictRealtime=yes
RestrictSUIDSGID=yes
RuntimeDirectory=systemd/resolve
RuntimeDirectoryPreserve=yes
SystemCallArchitectures=native
SystemCallErrorNumber=EPERM
SystemCallFilter=@system-service
Type=notify
User=systemd-resolve
ImportCredential=network.dns
ImportCredential=network.search_domains
WatchdogSec=3min

[Install]
WantedBy=sysinit.target
Alias=dbus-org.freedesktop.resolve1.service
2. systemctl cat systemd-sysctl.service
# /usr/lib/systemd/system/systemd-sysctl.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=Apply Kernel Variables
Documentation=man:systemd-sysctl.service(8) man:sysctl.d(5)
DefaultDependencies=no
Conflicts=shutdown.target
After=systemd-modules-load.service
Before=sysinit.target shutdown.target
ConditionPathIsReadWrite=/proc/sys/net/

[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart=/usr/lib/systemd/systemd-sysctl
TimeoutSec=90s
ImportCredential=sysctl.*

Best regards,
Alien Kong
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