/lib/systemd/system/systemd-resolved.service is in systemd 237-3ubuntu10.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 | # SPDX-License-Identifier: LGPL-2.1+
#
# 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=https://www.freedesktop.org/wiki/Software/systemd/resolved
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-sysusers.service systemd-networkd.service
Before=network.target nss-lookup.target shutdown.target
Conflicts=shutdown.target
Wants=nss-lookup.target
[Service]
Type=notify
Restart=always
RestartSec=0
ExecStart=!!/lib/systemd/systemd-resolved
WatchdogSec=3min
User=systemd-resolve
CapabilityBoundingSet=CAP_SETPCAP CAP_NET_RAW CAP_NET_BIND_SERVICE
AmbientCapabilities=CAP_SETPCAP CAP_NET_RAW CAP_NET_BIND_SERVICE
PrivateTmp=yes
PrivateDevices=yes
ProtectSystem=strict
ProtectHome=yes
ProtectControlGroups=yes
ProtectKernelTunables=yes
ProtectKernelModules=yes
MemoryDenyWriteExecute=yes
RestrictRealtime=yes
RestrictAddressFamilies=AF_UNIX AF_NETLINK AF_INET AF_INET6
SystemCallFilter=~@clock @cpu-emulation @debug @keyring @module @mount @obsolete @raw-io @reboot @swap
SystemCallArchitectures=native
LockPersonality=yes
RuntimeDirectory=systemd/resolve
RuntimeDirectoryPreserve=yes
[Install]
WantedBy=multi-user.target
Alias=dbus-org.freedesktop.resolve1.service
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