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mirror of https://github.com/systemd/systemd-stable.git synced 2024-12-24 21:34:08 +03:00
systemd-stable/units/systemd-resolved.service.in
Zbigniew Jędrzejewski-Szmek 79a67f3ca4 units: start systemd-resolved in basic.target
In the olden days systemd-resolved used dbus and it didn't make sense to start
it before dbus which is started fairly late. But we have mostly ported resolved
over to varlink. The queries from nss-resolve are done using varlink, so name
resolution can work without dbus. resolvectl still uses dbus, so e.g. 'resolvectl
query' will not work, but by starting systemd-resolved earlier we're not making this
any worse.

If systemd-resolved is started after dbus, it registers the name and everything
is fine. If it is started before dbus, it'll watch for the dbus socket and
connect later. So it should be fine to start systemd-resolved earlier. (If dbus
is stopped and restarted, unfortunately systemd-resolved does not reconnect.
This seems to be a small bug: since our daemons know how to watch for
dbus.socket, they could restart the watch if they ever lose the connection. But
this scenario shouldn't happen in normal boot, and restarting dbus is not
supported anyway.)

Moving the start earlier the following advantages:
- name resolution becomes availabe earlier, in particular for synthesized
  hostnames even before the network is up.
- basic.target is part of initrd.target, so systemd-resolved will get started
  in the initrd if installed. This is required for nfs-root when the server is
  specified using a name (https://bugzilla.redhat.com/show_bug.cgi?id=2037311).
2022-01-09 20:03:22 +01:00

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SYSTEMD

# 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-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
BusName=org.freedesktop.resolve1
CapabilityBoundingSet=CAP_SETPCAP CAP_NET_RAW CAP_NET_BIND_SERVICE
ExecStart=!!{{ROOTLIBEXECDIR}}/systemd-resolved
LockPersonality=yes
MemoryDenyWriteExecute=yes
NoNewPrivileges=yes
PrivateDevices=yes
PrivateTmp=yes
ProtectProc=invisible
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
{{SERVICE_WATCHDOG}}
[Install]
WantedBy=basic.target
Alias=dbus-org.freedesktop.resolve1.service