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Enable udev to set the transmit queue length of a device via a new directive to
be used in link files. The kernel stores this parameter as an unsigned 32 bit
integer. As typical values currently range in the order of 10 to a few 10,000
packets reduce the domain of valid values for this directive to 0..4294967294
and take the excluded 4294967295 == UINT32_MAX to indicate that the directive
is unset.
When suspend-then-hibernate is called, hooks have no ability to determine which
stage of the request is being handled; they only see 'pre' and 'post' with the
verb 'suspend-then-hibernate'. This change introduces an environment variable
called SYSTEMD_SLEEP_ACTION that contains the name of the action that is
processing: 'suspend', 'hibernate', 'hybrid-sleep', or
'suspend-after-failed-hibernate'.
Enhance systemd-networkd to be able to control a CAN device's berr-reporting
flag via the new boolean directive BusErrorReporting= to be used in network
files.
Importing the full environment is convenient, but it doesn't work too well in
practice, because we get a metric ton of shell-specific crap that should never
end up in the global environment block:
$ systemctl --user show-environment
...
SHELL=/bin/zsh
AUTOJUMP_ERROR_PATH=/home/zbyszek/.local/share/autojump/errors.log
AUTOJUMP_SOURCED=1
CONDA_SHLVL=0
CVS_RSH=ssh
DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus
DESKTOP_SESSION=gnome
DISPLAY=:0
FPATH=/usr/share/Modules/init/zsh-functions:/usr/local/share/zsh/site-functions:/usr/share/zsh/site-functions:/usr/share/zsh/5.8/functions
GDMSESSION=gnome
GDM_LANG=en_US.UTF-8
GNOME_SETUP_DISPLAY=:1
GUESTFISH_INIT=$'\\e[1;34m'
GUESTFISH_OUTPUT=$'\\e[0m'
GUESTFISH_PS1=$'\\[\\e[1;32m\\]><fs>\\[\\e[0;31m\\] '
GUESTFISH_RESTORE=$'\\e[0m'
HISTCONTROL=ignoredups
HISTSIZE=1000
LOADEDMODULES=
OLDPWD=/home/zbyszek
PWD=/home/zbyszek
QTDIR=/usr/lib64/qt-3.3
QTINC=/usr/lib64/qt-3.3/include
QTLIB=/usr/lib64/qt-3.3/lib
QT_IM_MODULE=ibus
SDL_VIDEO_MINIMIZE_ON_FOCUS_LOSS=0
SESSION_MANAGER=local/unix:@/tmp/.ICE-unix/2612,unix/unix:/tmp/.ICE-unix/2612
SHLVL=0
STEAM_FRAME_FORCE_CLOSE=1
TERM=xterm-256color
USERNAME=zbyszek
WISECONFIGDIR=/usr/share/wise2/
...
Plenty of shell-specific and terminal-specific stuff that have no global
significance.
Let's start warning when this is used to push people towards importing only
specific variables.
Putative NEWS entry:
* systemctl import-environment will now emit a warning when called without
any arguments (i.e. to import the full environment block of the called
program). This command will usually be invoked from a shell, which means
that it'll inherit a bunch of variables which are specific to that shell,
and usually to the tty the shell is connected to, and don't have any
meaning in the global context of the system or user service manager.
Instead, only specific variables should be imported into the manager
environment block.
Similarly, programs which update the manager environment block by directly
calling the D-Bus API of the manager, should also push specific variables,
and not the full inherited environment.
This adds a general description of "philosphy" of keeping the environemnt
block small and hints about systemd-run -P env.
The list of generated variables is split out to a subsection. Viewing
the patch with ignoring whitespace changes is recommended.
We don't ignore invalid assignments (except in import-environment to some
extent), previous description was wrong.
For https://bugzilla.redhat.com/show_bug.cgi?id=1912046#c17.
A minor tweak, that hopefully makes things a bit clearer, given that we
previously used "requirement dependency" when referring to Wants=, which
might be confusing given that we have Requires=
Document that systemd-sysusers doesn’t create the specified home
directory, and point to systemd-tmpfiles as the service that can create
the home directory instead. (systemd-tmpfiles-setup.service is ordered
After=systemd-sysusers.service, so by the time systemd-tmpfiles would
create the home directory, sysusers would have created the owning user
already, and it should all work out.)
The unit files are located at path /usr/lib/systemd/system.
This fixes the path reference to the unit file by adding the missing
path component system.
Let's link the three man pages together more tightly and explain what
the two targets are about, emphasizing local/quick/reliable/approximate
vs remote/slow/unreliable/accurate synchronization.
Follow-up for: 1431b2f701fe934b42e4
This commit adds support for disabling the read and write
workqueues with the new crypttab options no-read-workqueue
and no-write-workqueue. These correspond to the cryptsetup
options --perf-no_read_workqueue and --perf-no_write_workqueue
respectively.
Explicitly document the behavior introduced in #7437: when picking a new
UID shift base with "-U", a hash of the machine name will be tried
before falling back to fully random UID base candidates.
`AllowedIPs=` only affects "routing inside the network interface
itself", as in, which wireguard peer packets with a specific destination
address are sent to, and what source addresses are accepted from which
peer.
To cause packets to be sent via wireguard in first place, a route via
that interface needs to be added - either in the `[Routes]` section on
the `.network` matching the wireguard interface, or outside of networkd.
This is a common cause of misunderstanding, because tools like wg-quick
also add routes to the interface. However, those tools are meant as a
"extremely simple script for easily bringing up a WireGuard interface,
suitable for a few common use cases (from their manpage).
Networkd also should support other usecases - like setting AllowedIPs to
0.0.0.0/0 and ::/0 and having a dynamic routing protocol setting more
specific routes (or the user manually setting them).
Reported-In: https://github.com/systemd/systemd/issues/14176
* man: Advertise systemd-time-wait-sync.service more
The description of time-sync.target says that NTP services *should* pull
that target, but doesn't mention that e.g. systemd-timesyncd.service
doesn't actually do that. As a result, time-sync.target is reached way
earlier than people expect; see #5097, #8861, #11008.
systemd provides systemd-time-wait-sync.service to ameliorate this
problem, but doesn't feature it prominently in relevant manpages. In
fact, it's only mentioned in passing in systemd-timesyncd.service(8). As
a result, I ended up re-implementing that service, and I'm not the first
one: https://github.com/NixOS/nixpkgs/pull/51338
This patch adds a mention right in the description of time-sync.target,
which will hopefully raise awareness of this helper service.
Allow configuration for IPv6 discovered routes to be ignored instead of
adding them as a route. This can be used to block unwanted routes, for
example, you may wish to not receive some set of routes on an interface
if they are causing issues.
In hostnamed this is exposed as a dbus property, and in the logs in both
places.
This is of interest to network management software and such: if the fallback
hostname is used, it's not as useful as the real configured thing. Right now
various programs try to guess the source of hostname by looking at the string.
E.g. "localhost" is assumed to be not the real hostname, but "fedora" is. Any
such attempts are bound to fail, because we cannot distinguish "fedora" (a
fallback value set by a distro), from "fedora" (received from reverse dns),
from "fedora" read from /etc/hostname.
/run/systemd/fallback-hostname is written with the fallback hostname when
either pid1 or hostnamed sets the kernel hostname to the fallback value. Why
remember the fallback value and not the transient hostname in /run/hostname
instead?
We have three hostname types: "static", "transient", fallback".
– Distinguishing "static" is easy: the hostname that is set matches what
is in /etc/hostname.
– Distingiushing "transient" and "fallback" is not easy. And the
"transient" hostname may be set outside of pid1+hostnamed. In particular,
it may be set by container manager, some non-systemd tool in the initramfs,
or even by a direct call. All those mechanisms count as "transient". Trying
to get those cases to write /run/hostname is futile. It is much easier to
isolate the "fallback" case which is mostly under our control.
And since the file is only used as a flag to mark the hostname as fallback,
it can be hidden inside of our /run/systemd directory.
For https://bugzilla.redhat.com/show_bug.cgi?id=1892235.
We would sometimes ignore localhost-style names in /etc/hostname. That is
brittle. If the user configured some hostname, it's most likely because they
want to use that as the hostname. If they don't want to use such a hostname,
they should just not create the config. Everything becomes simples if we just
use the configured hostname as-is.
This behaviour seems to have been a workaround for Anaconda installer and other
tools writing out /etc/hostname with the default of "localhost.localdomain".
Anaconda PR to stop doing that: https://github.com/rhinstaller/anaconda/pull/3040.
That might have been useful as a work-around for other programs misbehaving if
/etc/hostname was not present, but nowadays it's not useful because systemd
mostly controls the hostname and it is perfectly happy without that file.
Apart from making things simpler, this allows users to set a hostname like
"localhost" and have it honoured, if such a whim strikes them.
The semantics were significantly changed in c779a44222
("hostnamed: Fix the way that static and transient host names interact", Feb. 2014),
but when the dbus api documentation was imported much later, it wasn't properly
adjusted to describe those new semantics.
34293dfafd which added systemd.hostname= also
added new behaviour.
Let's ove various bits and pieces around so that they are in more appropriate
places. Drop recommendations to set the hostname for DHCP or mDNS purposes.
Nowadays we expect tools that want to expose some different hostname to the
outside to manage that internally without affecting visible state. Also drop
mentions of DHCP or mDNS directly setting the hostname, since nowadays network
management software is expected to (and does) go through hostnamed.
Also, add a high-level description of semantics. It glosses over the details of
handling of localhost-style names. Later commits will remove this special handling
anyway.
This commit extends $SYSTEMD_COLORS to an enum variable (compared to
a simple boolean) which specifies the "colors mode". This means that, in
addition to disabling colors altogether, it's now possible to restrict
the console output to 16 or 256 colors only.
