<para>GNOME desktop environment was upgraded to 3.38, see its <linkxlink:href="https://help.gnome.org/misc/release-notes/3.38/">release notes</link>.</para>
<literal>systemd-journal2gelf</literal> no longer parses json and expects the receiving system to handle it. How to achieve this with Graylog is described in this <linkxlink:href="https://github.com/parse-nl/SystemdJournal2Gelf/issues/10">GitHub issue</link>.
Setting <option>services.openssh.authorizedKeysFiles</option> now also affects which keys <option>security.pam.enableSSHAgentAuth</option> will use.
WARNING: If you are using these options in combination do make sure that any key paths you use are present in <option>services.openssh.authorizedKeysFiles</option>!
Paperwork was updated to version 2. The on-disk format slightly changed,
and it is not possible to downgrade from Paperwork 2 back to Paperwork
1.3. Back your documents up before upgrading. See <linkxlink:href="https://forum.openpaper.work/t/paperwork-2-0/112/5">this thread</link> for more details.
The options <literal>services.slurm.dbdserver.storagePass</literal>
and <literal>services.slurm.dbdserver.configFile</literal> have been removed.
Use <literal>services.slurm.dbdserver.storagePassFile</literal> instead to provide the database password.
Extra config options can be given via the option <literal>services.slurm.dbdserver.extraConfig</literal>. The actual configuration file is created on the fly on startup of the service.
This avoids that the password gets exposed in the nix store.
</para>
</listitem>
<listitem>
<para>
Starting with version 1.7.0, the project formerly named <literal>CodiMD</literal>
is now named <literal>HedgeDoc</literal>.
New installations will no longer use the old name for users, state directories and such, this needs to be considered when moving state to a more recent NixOS installation.
Based on <xreflinkend="opt-system.stateVersion"/>, existing installations will continue to work.
The setting <xreflinkend="opt-services.redis.bind"/> defaults to <literal>127.0.0.1</literal> now, making Redis listen on the loopback interface only, and not all public network interfaces.
NixOS now emits a deprecation warning if systemd's <literal>StartLimitInterval</literal> setting is used in a <literal>serviceConfig</literal> section instead of in a <literal>unitConfig</literal>; that setting is deprecated and now undocumented for the service section by systemd upstream, but still effective and somewhat buggy there, which can be confusing. See <linkxlink:href="https://github.com/NixOS/nixpkgs/issues/45785">#45785</link> for details.
</para>
<para>
All services should use <xreflinkend="opt-systemd.services._name_.startLimitIntervalSec"/> or <literal>StartLimitIntervalSec</literal> in <xreflinkend="opt-systemd.services._name_.unitConfig"/> instead.
The Unbound DNS resolver service (<literal>services.unbound</literal>) has been refactored to allow reloading, control sockets and to fix startup ordering issues.
</para>
<para>
It is now possible to enable a local UNIX control socket for unbound by setting the <xreflinkend="opt-services.unbound.localControlSocketPath"/>
option.
</para>
<para>
Previously we just applied a very minimal set of restrictions and
trusted unbound to properly drop root privs and capabilities.
</para>
<para>
As of this we are (for the most part) just using the upstream
example unit file for unbound. The main difference is that we start
unbound as <literal>unbound</literal> user with the required capabilities instead of
letting unbound do the chroot & uid/gid changes.
</para>
<para>
The upstream unit configuration this is based on is a lot stricter with
all kinds of permissions then our previous variant. It also came with
the default of having the <literal>Type</literal> set to <literal>notify</literal>, therefore we are now also
using the <literal>unbound-with-systemd</literal> package here. Unbound will start up,
read the configuration files and start listening on the configured ports
before systemd will declare the unit <literal>active (running)</literal>.
This will likely help with startup order and the occasional race condition during system
activation where the DNS service is started but not yet ready to answer
queries. Services depending on <literal>nss-lookup.target</literal> or <literal>unbound.service</literal>
are now be able to use unbound when those targets have been reached.
</para>
<para>
Aditionally to the much stricter runtime environmet the
<literal>/dev/urandom</literal> mount lines we previously had in the code (that would
randomly failed during the stop-phase) have been removed as systemd will take care of those for us.
</para>
<para>
The <literal>preStart</literal> script is now only required if we enabled the trust
anchor updates (which are still enabled by default).
</para>
<para>
Another benefit of the refactoring is that we can now issue reloads via
either <literal>pkill -HUP unbound</literal> and <literal>systemctl reload unbound</literal> to reload the
running configuration without taking the daemon offline. A prerequisite
of this was that unbound configuration is available on a well known path
on the file system. We are using the path <literal>/etc/unbound/unbound.conf</literal> as that is the
default in the CLI tooling which in turn enables us to use
<literal>unbound-control</literal> without passing a custom configuration location.
