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nixpkgs/nixos/doc/manual/release-notes/rl-1903.xml
2019-05-20 12:31:24 +01:00

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<section xmlns="http://docbook.org/ns/docbook"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:xi="http://www.w3.org/2001/XInclude"
version="5.0"
xml:id="sec-release-19.03">
<title>Release 19.03 (“Koi”, 2019/04/11)</title>
<section xmlns="http://docbook.org/ns/docbook"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:xi="http://www.w3.org/2001/XInclude"
version="5.0"
xml:id="sec-release-19.03-highlights">
<title>Highlights</title>
<para>
In addition to numerous new and upgraded packages, this release has the
following highlights:
</para>
<itemizedlist>
<listitem>
<para>
End of support is planned for end of October 2019, handing over to 19.09.
</para>
</listitem>
<listitem>
<para>
The default Python 3 interpreter is now CPython 3.7 instead of CPython
3.6.
</para>
</listitem>
<listitem>
<para>
Added the Pantheon desktop environment. It can be enabled through
<varname>services.xserver.desktopManager.pantheon.enable</varname>.
</para>
<note>
<para>
By default, <varname>services.xserver.desktopManager.pantheon</varname>
enables LightDM as a display manager, as pantheon's screen locking
implementation relies on it.
</para>
<para>
Because of that it is recommended to leave LightDM enabled. If you'd like
to disable it anyway, set
<option>services.xserver.displayManager.lightdm.enable</option> to
<literal>false</literal> and enable your preferred display manager.
</para>
</note>
<para>
Also note that Pantheon's LightDM greeter is not enabled by default,
because it has numerous issues in NixOS and isn't optimal for use here
yet.
</para>
</listitem>
<listitem>
<para>
A major refactoring of the Kubernetes module has been completed.
Refactorings primarily focus on decoupling components and enhancing
security. Two-way TLS and RBAC has been enabled by default for all
components, which slightly changes the way the module is configured. See:
<xref linkend="sec-kubernetes"/> for details.
</para>
</listitem>
<listitem>
<para>
There is now a set of <option>confinement</option> options for
<option>systemd.services</option>, which allows to restrict services
into a <citerefentry>
<refentrytitle>chroot</refentrytitle>
<manvolnum>2</manvolnum>
</citerefentry>ed environment that only contains the store paths from
the runtime closure of the service.
</para>
</listitem>
</itemizedlist>
</section>
<section xmlns="http://docbook.org/ns/docbook"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:xi="http://www.w3.org/2001/XInclude"
version="5.0"
xml:id="sec-release-19.03-new-services">
<title>New Services</title>
<para>
The following new services were added since the last release:
</para>
<itemizedlist>
<listitem>
<para>
<literal>./programs/nm-applet.nix</literal>
</para>
</listitem>
<listitem>
<para>
There is a new <varname>security.googleOsLogin</varname> module for using
<link xlink:href="https://cloud.google.com/compute/docs/instances/managing-instance-access">OS
Login</link> to manage SSH access to Google Compute Engine instances,
which supersedes the imperative and broken
<literal>google-accounts-daemon</literal> used in
<literal>nixos/modules/virtualisation/google-compute-config.nix</literal>.
</para>
</listitem>
<listitem>
<para>
<literal>./services/misc/beanstalkd.nix</literal>
</para>
</listitem>
<listitem>
<para>
There is a new <varname>services.cockroachdb</varname> module for running
CockroachDB databases. NixOS now ships with CockroachDB 2.1.x as well,
available on <literal>x86_64-linux</literal> and
<literal>aarch64-linux</literal>.
</para>
</listitem>
</itemizedlist>
<itemizedlist>
<listitem>
<para>
<literal>./security/duosec.nix</literal>
</para>
</listitem>
<listitem>
<para>
The <link xlink:href="https://duo.com/docs/duounix">PAM module for Duo
Security</link> has been enabled for use. One can configure it using the
<option>security.duosec</option> options along with the corresponding PAM
option in
<option>security.pam.services.&lt;name?&gt;.duoSecurity.enable</option>.
</para>
</listitem>
</itemizedlist>
</section>
<section xmlns="http://docbook.org/ns/docbook"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:xi="http://www.w3.org/2001/XInclude"
version="5.0"
xml:id="sec-release-19.03-incompatibilities">
<title>Backward Incompatibilities</title>
<para>
When upgrading from a previous release, please be aware of the following
incompatible changes:
</para>
<itemizedlist>
<listitem>
<para>
The minimum version of Nix required to evaluate Nixpkgs is now 2.0.
</para>
<itemizedlist>
<listitem>
<para>
For users of NixOS 18.03 and 19.03, NixOS defaults to Nix 2.0, but
supports using Nix 1.11 by setting <literal>nix.package =
pkgs.nix1;</literal>. If this option is set to a Nix 1.11 package, you
will need to either unset the option or upgrade it to Nix 2.0.
</para>
</listitem>
<listitem>
<para>
For users of NixOS 17.09, you will first need to upgrade Nix by setting
<literal>nix.package = pkgs.nixStable2;</literal> and run
<command>nixos-rebuild switch</command> as the <literal>root</literal>
user.
</para>
</listitem>
<listitem>
<para>
For users of a daemon-less Nix installation on Linux or macOS, you can
upgrade Nix by running <command>curl https://nixos.org/nix/install |
sh</command>, or prior to doing a channel update, running
<command>nix-env -iA nix</command>.
</para>
<para>
If you have already run a channel update and Nix is no longer able to
evaluate Nixpkgs, the error message printed should provide adequate
directions for upgrading Nix.
</para>
</listitem>
<listitem>
<para>
For users of the Nix daemon on macOS, you can upgrade Nix by running
<command>sudo -i sh -c 'nix-channel --update &amp;&amp; nix-env -iA
nixpkgs.nix'; sudo launchctl stop org.nixos.nix-daemon; sudo launchctl
start org.nixos.nix-daemon</command>.
</para>
</listitem>
</itemizedlist>
</listitem>
<listitem>
<para>
The <varname>buildPythonPackage</varname> function now sets
<varname>strictDeps = true</varname> to help distinguish between native
and non-native dependencies in order to improve cross-compilation
compatibility. Note however that this may break user expressions.
</para>
</listitem>
<listitem>
<para>
The <varname>buildPythonPackage</varname> function now sets <varname>LANG
= C.UTF-8</varname> to enable Unicode support. The
<varname>glibcLocales</varname> package is no longer needed as a build
input.
</para>
</listitem>
<listitem>
<para>
The Syncthing state and configuration data has been moved from
<varname>services.syncthing.dataDir</varname> to the newly defined
<varname>services.syncthing.configDir</varname>, which default to
<literal>/var/lib/syncthing/.config/syncthing</literal>. This change makes
possible to share synced directories using ACLs without Syncthing
resetting the permission on every start.
</para>
</listitem>
<listitem>
<para>
The <literal>ntp</literal> module now has sane default restrictions. If
you're relying on the previous defaults, which permitted all queries and
commands from all firewall-permitted sources, you can set
<varname>services.ntp.restrictDefault</varname> and
<varname>services.ntp.restrictSource</varname> to <literal>[]</literal>.
</para>
</listitem>
<listitem>
<para>
Package <varname>rabbitmq_server</varname> is renamed to
<varname>rabbitmq-server</varname>.
</para>
</listitem>
<listitem>
<para>
The <literal>light</literal> module no longer uses setuid binaries, but
udev rules. As a consequence users of that module have to belong to the
<literal>video</literal> group in order to use the executable (i.e.
<literal>users.users.yourusername.extraGroups = ["video"];</literal>).
</para>
</listitem>
<listitem>
<para>
Buildbot now supports Python 3 and its packages have been moved to
<literal>pythonPackages</literal>. The options
<option>services.buildbot-master.package</option> and
<option>services.buildbot-worker.package</option> can be used to select
the Python 2 or 3 version of the package.
</para>
</listitem>
<listitem>
<para>
Options
<literal>services.znc.confOptions.networks.<replaceable>name</replaceable>.userName</literal>
and
<literal>services.znc.confOptions.networks.<replaceable>name</replaceable>.modulePackages</literal>
were removed. They were never used for anything and can therefore safely
be removed.
</para>
</listitem>
<listitem>
<para>
Package <literal>wasm</literal> has been renamed
<literal>proglodyte-wasm</literal>. The package <literal>wasm</literal>
will be pointed to <literal>ocamlPackages.wasm</literal> in 19.09, so make
sure to update your configuration if you want to keep
<literal>proglodyte-wasm</literal>
</para>
</listitem>
<listitem>
<para>
When the <literal>nixpkgs.pkgs</literal> option is set, NixOS will no
longer ignore the <literal>nixpkgs.overlays</literal> option. The old
behavior can be recovered by setting <literal>nixpkgs.overlays =
lib.mkForce [];</literal>.
</para>
</listitem>
<listitem>
<para>
OpenSMTPD has been upgraded to version 6.4.0p1. This release makes
backwards-incompatible changes to the configuration file format. See
<command>man smtpd.conf</command> for more information on the new file
format.
</para>
</listitem>
<listitem>
<para>
The versioned <varname>postgresql</varname> have been renamed to use
underscore number seperators. For example, <varname>postgresql96</varname>
has been renamed to <varname>postgresql_9_6</varname>.
</para>
</listitem>
<listitem>
<para>
Package <literal>consul-ui</literal> and passthrough
<literal>consul.ui</literal> have been removed. The package
<literal>consul</literal> now uses upstream releases that vendor the UI
into the binary. See
<link xlink:href="https://github.com/NixOS/nixpkgs/pull/48714#issuecomment-433454834">#48714</link>
for details.
</para>
</listitem>
<listitem>
<para>
Slurm introduces the new option
<literal>services.slurm.stateSaveLocation</literal>, which is now set to
<literal>/var/spool/slurm</literal> by default (instead of
<literal>/var/spool</literal>). Make sure to move all files to the new
directory or to set the option accordingly.
</para>
<para>
The slurmctld now runs as user <literal>slurm</literal> instead of
<literal>root</literal>. If you want to keep slurmctld running as
<literal>root</literal>, set <literal>services.slurm.user =
root</literal>.
</para>
<para>
The options <literal>services.slurm.nodeName</literal> and
<literal>services.slurm.partitionName</literal> are now sets of strings to
correctly reflect that fact that each of these options can occour more
than once in the configuration.
</para>
</listitem>
<listitem>
<para>
The <literal>solr</literal> package has been upgraded from 4.10.3 to 7.5.0
and has undergone some major changes. The <literal>services.solr</literal>
module has been updated to reflect these changes. Please review
http://lucene.apache.org/solr/ carefully before upgrading.
</para>
</listitem>
<listitem>
<para>
Package <literal>ckb</literal> is renamed to <literal>ckb-next</literal>,
and options <literal>hardware.ckb.*</literal> are renamed to
<literal>hardware.ckb-next.*</literal>.
</para>
</listitem>
<listitem>
<para>
The option
<literal>services.xserver.displayManager.job.logToFile</literal> which was
previously set to <literal>true</literal> when using the display managers
<literal>lightdm</literal>, <literal>sddm</literal> or
<literal>xpra</literal> has been reset to the default value
(<literal>false</literal>).
</para>
</listitem>
<listitem>
<para>
Network interface indiscriminate NixOS firewall options
(<literal>networking.firewall.allow*</literal>) are now preserved when
also setting interface specific rules such as
<literal>networking.firewall.interfaces.en0.allow*</literal>. These rules
continue to use the pseudo device "default"
(<literal>networking.firewall.interfaces.default.*</literal>), and
assigning to this pseudo device will override the
(<literal>networking.firewall.allow*</literal>) options.
</para>
</listitem>
<listitem>
<para>
The <literal>nscd</literal> service now disables all caching of
<literal>passwd</literal> and <literal>group</literal> databases by
default. This was interferring with the correct functioning of the
<literal>libnss_systemd.so</literal> module which is used by
<literal>systemd</literal> to manage uids and usernames in the presence of
<literal>DynamicUser=</literal> in systemd services. This was already the
default behaviour in presence of <literal>services.sssd.enable =
true</literal> because nscd caching would interfere with
<literal>sssd</literal> in unpredictable ways as well. Because we're using
nscd not for caching, but for convincing glibc to find NSS modules in the
nix store instead of an absolute path, we have decided to disable caching
globally now, as it's usually not the behaviour the user wants and can
lead to surprising behaviour. Furthermore, negative caching of host
lookups is also disabled now by default. This should fix the issue of dns
lookups failing in the presence of an unreliable network.
</para>
<para>
If the old behaviour is desired, this can be restored by setting the
<literal>services.nscd.config</literal> option with the desired caching
parameters.
<programlisting>
services.nscd.config =
''
server-user nscd
threads 1
paranoia no
debug-level 0
enable-cache passwd yes
positive-time-to-live passwd 600
negative-time-to-live passwd 20
suggested-size passwd 211
check-files passwd yes
persistent passwd no
shared passwd yes
enable-cache group yes
positive-time-to-live group 3600
negative-time-to-live group 60
suggested-size group 211
check-files group yes
persistent group no
shared group yes
enable-cache hosts yes
positive-time-to-live hosts 600
negative-time-to-live hosts 5
suggested-size hosts 211
check-files hosts yes
persistent hosts no
shared hosts yes
'';
</programlisting>
See
<link xlink:href="https://github.com/NixOS/nixpkgs/pull/50316">#50316</link>
for details.
</para>
</listitem>
<listitem>
<para>
GitLab Shell previously used the nix store paths for the
<literal>gitlab-shell</literal> command in its
<literal>authorized_keys</literal> file, which might stop working after
garbage collection. To circumvent that, we regenerated that file on each
startup. As <literal>gitlab-shell</literal> has now been changed to use
<literal>/var/run/current-system/sw/bin/gitlab-shell</literal>, this is
not necessary anymore, but there might be leftover lines with a nix store
path. Regenerate the <literal>authorized_keys</literal> file via
<command>sudo -u git -H gitlab-rake gitlab:shell:setup</command> in that
case.
</para>
</listitem>
<listitem>
<para>
The <literal>pam_unix</literal> account module is now loaded with its
control field set to <literal>required</literal> instead of
<literal>sufficient</literal>, so that later PAM account modules that
might do more extensive checks are being executed. Previously, the whole
account module verification was exited prematurely in case a nss module
provided the account name to <literal>pam_unix</literal>. The LDAP and
SSSD NixOS modules already add their NSS modules when enabled. In case
your setup breaks due to some later PAM account module previosuly
shadowed, or failing NSS lookups, please file a bug. You can get back the
old behaviour by manually setting <literal>
<![CDATA[security.pam.services.<name?>.text]]>
</literal>.
</para>
</listitem>
<listitem>
<para>
The <literal>pam_unix</literal> password module is now loaded with its
control field set to <literal>sufficient</literal> instead of
<literal>required</literal>, so that password managed only by later PAM
password modules are being executed. Previously, for example, changing an
LDAP account's password through PAM was not possible: the whole password
module verification was exited prematurely by <literal>pam_unix</literal>,
preventing <literal>pam_ldap</literal> to manage the password as it
should.
</para>
</listitem>
<listitem>
<para>
<literal>fish</literal> has been upgraded to 3.0. It comes with a number
of improvements and backwards incompatible changes. See the
<literal>fish</literal>
<link xlink:href="https://github.com/fish-shell/fish-shell/releases/tag/3.0.0">release
notes</link> for more information.
</para>
</listitem>
<listitem>
<para>
The ibus-table input method has had a change in config format, which
causes all previous settings to be lost. See
<link xlink:href="https://github.com/mike-fabian/ibus-table/commit/f9195f877c5212fef0dfa446acb328c45ba5852b">this
commit message</link> for details.
</para>
</listitem>
<listitem>
<para>
NixOS module system type <literal>types.optionSet</literal> and
<literal>lib.mkOption</literal> argument <literal>options</literal> are
deprecated. Use <literal>types.submodule</literal> instead.
(<link xlink:href="https://github.com/NixOS/nixpkgs/pull/54637">#54637</link>)
</para>
</listitem>
<listitem>
<para>
<literal>matrix-synapse</literal> has been updated to version 0.99. It
will <link xlink:href="https://github.com/matrix-org/synapse/pull/4509">no
longer generate a self-signed certificate on first launch</link> and will
be
<link xlink:href="https://matrix.org/blog/2019/02/05/synapse-0-99-0/">the
last version to accept self-signed certificates</link>. As such, it is now
recommended to use a proper certificate verified by a root CA (for example
Let's Encrypt). The new <link linkend="module-services-matrix">manual
chapter on Matrix</link> contains a working example of using nginx as a
reverse proxy in front of <literal>matrix-synapse</literal>, using Let's
Encrypt certificates.
</para>
</listitem>
<listitem>
<para>
<literal>mailutils</literal> now works by default when
<literal>sendmail</literal> is not in a setuid wrapper. As a consequence,
the <literal>sendmailPath</literal> argument, having lost its main use,
has been removed.
</para>
</listitem>
<listitem>
<para>
<literal>graylog</literal> has been upgraded from version 2.* to 3.*. Some
setups making use of extraConfig (especially those exposing Graylog via
reverse proxies) need to be updated as upstream removed/replaced some
settings. See
<link xlink:href="http://docs.graylog.org/en/3.0/pages/upgrade/graylog-3.0.html#simplified-http-interface-configuration">Upgrading
Graylog</link> for details.
</para>
</listitem>
<listitem>
<para>
The option <literal>users.ldap.bind.password</literal> was renamed to <literal>users.ldap.bind.passwordFile</literal>,
and needs to be readable by the <literal>nslcd</literal> user.
Same applies to the new <literal>users.ldap.daemon.rootpwmodpwFile</literal> option.
</para>
</listitem>
<listitem>
<para>
<literal>nodejs-6_x</literal> is end-of-life.
<literal>nodejs-6_x</literal>, <literal>nodejs-slim-6_x</literal> and
<literal>nodePackages_6_x</literal> are removed.
</para>
</listitem>
</itemizedlist>
</section>
<section xmlns="http://docbook.org/ns/docbook"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:xi="http://www.w3.org/2001/XInclude"
version="5.0"
xml:id="sec-release-19.03-notable-changes">
<title>Other Notable Changes</title>
<itemizedlist>
<listitem>
<para>
The <option>services.matomo</option> module gained the option
<option>services.matomo.package</option> which determines the used Matomo
version.
</para>
<para>
The Matomo module now also comes with the systemd service
<literal>matomo-archive-processing.service</literal> and a timer that
automatically triggers archive processing every hour. This means that you
can safely
<link xlink:href="https://matomo.org/docs/setup-auto-archiving/#disable-browser-triggers-for-matomo-archiving-and-limit-matomo-reports-to-updating-every-hour">
disable browser triggers for Matomo archiving </link> at
<literal>Administration > System > General Settings</literal>.
</para>
<para>
Additionally, you can enable to
<link xlink:href="https://matomo.org/docs/privacy/#step-2-delete-old-visitors-logs">
delete old visitor logs </link> at <literal>Administration > System >
Privacy</literal>, but make sure that you run <literal>systemctl start
matomo-archive-processing.service</literal> at least once without errors
if you have already collected data before, so that the reports get
archived before the source data gets deleted.
</para>
</listitem>
<listitem>
<para>
<literal>composableDerivation</literal> along with supporting library
functions has been removed.
</para>
</listitem>
<listitem>
<para>
The deprecated <literal>truecrypt</literal> package has been removed and
<literal>truecrypt</literal> attribute is now an alias for
<literal>veracrypt</literal>. VeraCrypt is backward-compatible with
TrueCrypt volumes. Note that <literal>cryptsetup</literal> also supports
loading TrueCrypt volumes.
</para>
</listitem>
<listitem>
<para>
The Kubernetes DNS addons, kube-dns, has been replaced with CoreDNS. This
change is made in accordance with Kubernetes making CoreDNS the official
default starting from
<link xlink:href="https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG-1.11.md#sig-cluster-lifecycle">Kubernetes
v1.11</link>. Please beware that upgrading DNS-addon on existing clusters
might induce minor downtime while the DNS-addon terminates and
re-initializes. Also note that the DNS-service now runs with 2 pod
replicas by default. The desired number of replicas can be configured
using: <option>services.kubernetes.addons.dns.replicas</option>.
</para>
</listitem>
<listitem>
<para>
The quassel-webserver package and module was removed from nixpkgs due to
the lack of maintainers.
</para>
</listitem>
<listitem>
<para>
The manual gained a <link linkend="module-services-matrix"> new chapter on
self-hosting <literal>matrix-synapse</literal> and
<literal>riot-web</literal> </link>, the most prevalent server and client
implementations for the
<link xlink:href="https://matrix.org/">Matrix</link> federated
communication network.
</para>
</listitem>
<listitem>
<para>
The astah-community package was removed from nixpkgs due to it being
discontinued and the downloads not being available anymore.
</para>
</listitem>
<listitem>
<para>
The httpd service now saves log files with a .log file extension by
default for easier integration with the logrotate service.
</para>
</listitem>
<listitem>
<para>
The owncloud server packages and httpd subservice module were removed from
nixpkgs due to the lack of maintainers.
</para>
</listitem>
<listitem>
<para>
It is possible now to uze ZRAM devices as general purpose ephemeral block
devices, not only as swap. Using more than 1 device as ZRAM swap is no
longer recommended, but is still possible by setting
<literal>zramSwap.swapDevices</literal> explicitly.
</para>
<para>
ZRAM algorithm can be changed now.
</para>
<para>
Changes to ZRAM algorithm are applied during <literal>nixos-rebuild
switch</literal>, so make sure you have enough swap space on disk to
survive ZRAM device rebuild. Alternatively, use <literal>nixos-rebuild
boot; reboot</literal>.
</para>
</listitem>
<listitem>
<para>
Flat volumes are now disabled by default in
<literal>hardware.pulseaudio</literal>. This has been done to prevent
applications, which are unaware of this feature, setting their volumes to
100% on startup causing harm to your audio hardware and potentially your
ears.
</para>
<note>
<para>
With this change application specific volumes are relative to the master
volume which can be adjusted independently, whereas before they were
absolute; meaning that in effect, it scaled the device-volume with the
volume of the loudest application.
</para>
</note>
</listitem>
<listitem>
<para>
The
<link xlink:href="https://github.com/DanielAdolfsson/ndppd"><literal>ndppd</literal></link>
module now supports <link linkend="opt-services.ndppd.enable">all config
options</link> provided by the current upstream version as service
options. Additionally the <literal>ndppd</literal> package doesn't contain
the systemd unit configuration from upstream anymore, the unit is
completely configured by the NixOS module now.
</para>
</listitem>
<listitem>
<para>
New installs of NixOS will default to the Redmine 4.x series unless
otherwise specified in <literal>services.redmine.package</literal> while
existing installs of NixOS will default to the Redmine 3.x series.
</para>
</listitem>
<listitem>
<para>
The <link linkend="opt-services.grafana.enable">Grafana module</link> now
supports declarative
<link xlink:href="http://docs.grafana.org/administration/provisioning/">datasource
and dashboard</link> provisioning.
</para>
</listitem>
<listitem>
<para>
The use of insecure ports on kubernetes has been deprecated. Thus options:
<varname>services.kubernetes.apiserver.port</varname> and
<varname>services.kubernetes.controllerManager.port</varname> has been
renamed to <varname>.insecurePort</varname>, and default of both options
has changed to 0 (disabled).
</para>
</listitem>
<listitem>
<para>
Note that the default value of
<varname>services.kubernetes.apiserver.bindAddress</varname> has changed
from 127.0.0.1 to 0.0.0.0, allowing the apiserver to be accessible from
outside the master node itself. If the apiserver insecurePort is enabled,
it is strongly recommended to only bind on the loopback interface. See:
<varname>services.kubernetes.apiserver.insecurebindAddress</varname>.
</para>
</listitem>
<listitem>
<para>
The option
<varname>services.kubernetes.apiserver.allowPrivileged</varname> and
<varname>services.kubernetes.kubelet.allowPrivileged</varname> now
defaults to false. Disallowing privileged containers on the cluster.
</para>
</listitem>
<listitem>
<para>
The kubernetes module does no longer add the kubernetes package to
<varname>environment.systemPackages</varname> implicitly.
</para>
</listitem>
<listitem>
<para>
The <literal>intel</literal> driver has been removed from the default list
of <link linkend="opt-services.xserver.videoDrivers">X.org video
drivers</link>. The <literal>modesetting</literal> driver should take over
automatically, it is better maintained upstream and has less problems with
advanced X11 features. This can lead to a change in the output names used
by <literal>xrandr</literal>. Some performance regressions on some GPU
models might happen. Some OpenCL and VA-API applications might also break
(Beignet seems to provide OpenCL support with
<literal>modesetting</literal> driver, too). Kernel mode setting API does
not support backlight control, so <literal>xbacklight</literal> tool will
not work; backlight level can be controlled directly via
<literal>/sys/</literal> or with <literal>brightnessctl</literal>. Users
who need this functionality more than multi-output XRandR are advised to
add `intel` to `videoDrivers` and report an issue (or provide additional
details in an existing one)
</para>
</listitem>
<listitem>
<para>
Openmpi has been updated to version 4.0.0, which removes some deprecated
MPI-1 symbols. This may break some older applications that still rely on
those symbols. An upgrade guide can be found
<link xlink:href="https://www.open-mpi.org/faq/?category=mpi-removed">here</link>.
</para>
<para>
The nginx package now relies on OpenSSL 1.1 and supports TLS 1.3 by
default. You can set the protocols used by the nginx service using
<xref linkend="opt-services.nginx.sslProtocols"/>.
</para>
</listitem>
<listitem>
<para>
A new subcommand <command>nixos-rebuild edit</command> was added.
</para>
</listitem>
</itemizedlist>
</section>
</section>