/lib/systemd/system/systemd-resolved.service

/lib/systemd/system/systemd-resolved.service

#  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]
AmbientCapabilities=CAP_SETPCAP CAP_NET_RAW CAP_NET_BIND_SERVICE
CapabilityBoundingSet=CAP_SETPCAP CAP_NET_RAW CAP_NET_BIND_SERVICE
ExecStart=!!/lib/systemd/systemd-resolved
LockPersonality=yes
MemoryDenyWriteExecute=yes
NoNewPrivileges=yes
PrivateDevices=yes
PrivateTmp=yes
ProtectControlGroups=yes
ProtectHome=yes
ProtectKernelModules=yes
ProtectKernelTunables=yes
ProtectKernelLogs=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
WatchdogSec=3min

[Install]
WantedBy=multi-user.target
Alias=dbus-org.freedesktop.resolve1.service

See also

• Systemd: systemctl, systemd-journald, journalctl systemd-cat, systemd-logind, systemd-networkd:networkctl, systemd-timesyncd, systemd-resolved, systemd-udevd , Systemd-logind: loginctl, hostnamectl, udevadm, systemd-run, portablectl, systemd-nspawn, systemd resource management, Timer (systemd), systemd logs, /etc/systemd/, systemd services, systemd-mount, /run/systemd/, .service, /usr/lib/systemd/, /usr/lib/systemd/system/, /usr/lib/systemd/system/systemd-resolved.service, /lib/systemd/, machinectl, systemd-oomd, systemd-analyze

https://wiki.ubuntu.com/DebuggingSystemd