Systemd 246 Released With Many Changes
Written by Michael Larabel in systemd on 30 July 2020 at 03:48 PM EDT. 77 Comments
SYSTEMD --
Systemd 246 is out today as the newest version of this dominant Linux init system and system/service manager. Systemd 246 has a lot of new functionality in time for making it into at least some of the autumn 2020 Linux distributions.

Among the many changes to find with systemd 246 are:

- Systemd-journald now supports Zstd compression of journal files. Similarly, coredumps collected by systemd-coredump can now make use of Zstd compression.

- Tmpfs mounts automatically created by systemd such as for /tmp and /run whill now have a limit of 50% of RAM for /tmp and /dev/sdm while 10% of RAM for other mounts.

- The systemd-homed LUKS back-end can now automatically discard empty system blocks when a user logs out.

- Systemd-homed also now better protects against potential double data encryption scenarios. Systemd-homed can also support unlocking home directories using FIOD2 security tokens.

- Systemd-cryptsetup can now activate Microsoft BitLocker volumes during boot.

- A new systemd-xdg-autostart-generator command for generating systemd unit files from XDG autostart .desktop files.

- A change from Microsoft that will now expose some host OS information to containers.

- The system hostname can now be set at boot time with the systemd.hostname= kernel option. There are also other new kernel command line options like systemd.swap= for toggling if SWAP is enabled and systemd.clock-usec= for specifying the Unix time at boot.

- Systemd has begun a new hardware database file that is collecting information on PCI and USB devices that correctly auto-suspend. This database is initially based on data from ChromeOS/ChromiumOS.

- A number of systemd-networkd improvements. Similarly, systemd-resolved saw a number of improvements including SNI validation for its DNS-over-TLS support.

- New settings like ConditionPathIsEncrypted, AssertPathIsEncrypted, ConditionEnvironment, AssertEnvironment, RootHash / RootHashSignature, TimeoutStartFailureMode/TimeoutStopFailureMode, and CoredumpFilter.

- Systemd will warn of processes leftover in a unit after that unit has stopped.

- The CPU affinity setting in systemd service unit files can now be set to "numa" so their mask is set based on the NUMA mask.

- Basic support for the cgroup v2 freezer.

- PID1 can automatically load pre-compiled AppArmor policies during early boot.

More details on all of the systemd 246 changes via the NEWS file. Those building systemd from source can find it via GitHub.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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