[systemd-devel] [ANNOUNCE] systemd 212

Kay Sievers kay at vrfy.org
Tue Mar 25 16:28:59 PDT 2014

Many bugfixes, and a number of new features:



        * When restoring the screen brightness at boot, stay away from
          the darkest setting or from the lowest 5% of the available
          range, depending on which is the larger value of both. This
          should effectively protect the user from rebooting into a
          black screen, should the brightness have been set to minimum
          by accident.

        * sd-login gained a new sd_machine_get_class() call to
          determine the class ("vm" or "container") of a machine
          registered with machined.

        * sd-login gained new calls
          to query the identity of the peer of a local AF_UNIX
          connection. They operate similar to their sd_pid_get_xyz()

        * PID 1 will now maintain a system-wide system state engine
          with the states "starting", "running", "degraded",
          "maintenance", "stopping". These states are bound to system
          startup, normal runtime, runtime with at least one failed
          service, rescue/emergency mode and system shutdown. This
          state is shown in the "systemctl status" output when no unit
          name is passed. It is useful to determine system state, in
          particularly when doing so for many systems or containers at

        * A new command "list-machines" has been added to "systemctl"
          that lists all local OS containers and shows their system
          state (see above), if systemd runs inside of them.

        * systemctl gained a new "-r" switch to recursively enumerate
          units on all local containers, when used with the
          "list-unit" command (which is the default one that is
          executed when no parameters are specified).

        * The GPT automatic partition discovery logic will now honour
          two GPT partition flags: one may be set on a partition to
          cause it to be mounted read-only, and the other may be set
          on a partition to ignore it during automatic discovery.

        * Two new GPT type UUIDs have been added for automatic root
          partition discovery, for 32bit and 64bit ARM. This is not
          particularly useful for discovering the root directory on
          these architectures during bare-metal boots (since UEFI is
          not common there), but still very useful to allow booting of
          ARM disk images in nspawn with the -i option.

        * MAC addresses of interfaces created with nspawn's
          --network-interface= switch will now be generated from the
          machine name, and thus be stable between multiple invocations
          of the container.

        * logind will now automatically remove all IPC objects owned
          by a user if she or he fully logs out. This makes sure that
          users who are logged out cannot continue to consume IPC
          resources. This covers SysV memory, semaphores and message
          queues as well as POSIX shared memory and message
          queues. Traditionally SysV and POSIX IPC had no life-cycle
          limits, with this functionality this is corrected. This may
          be turned off using the RemoveIPC= switch of logind.conf.

        * The systemd-machine-id-setup and tmpfiles tools gained a
          --root= switch to operate on a specific root directory,
          instead of /.

        * journald can now forward logged messages to the TTYs of all
          logged in users ("wall"). This is the default for all
          emergency messages now.

        * A new tool systemd-journal-remote has been added to stream
          journal log messages across the network.

        * /sys/fs/cgroup/ is now mounted read-only after all cgroup
          controller trees are mounted into it. Note that the
          directories mounted beneath it are not read-only. This is a
          security measure and is particularly useful because glibc
          actually includes a search logic to pick any tmpfs it can
          find to implement shm_open() if /dev/shm is not available
          (which it might very well be in namespaced setups).

        * machinectl gained a new "poweroff" command to cleanly power
          down a local OS container.

        * The PrivateDevices= unit file setting will now also drop the
          CAP_MKNOD capability from the capability bound set, and
          imply DevicePolicy=closed.

        * PrivateDevices=, PrivateNetwork= and PrivateTmp= is now used
          comprehensively on all long-running systemd services where
          this is appropriate.

        * systemd-udevd will now run in a disassociated mount
          namespace. To mount directories from udev rules make sure to
          pull in mount units via SYSTEMD_WANTS properties.

        * The kdbus support gained support for uploading policy into
          the kernel. sd-bus gained support for creating "monitoring"
          connections that can eavesdrop into all bus communication
          for debugging purposes.

        * Timestamps may now be specified in seconds since the UNIX
          epoch Jan 1st, 1970 by specifying "@" followed by the value
          in seconds.

        * Native tcpwrap support in systemd has been removed. tcpwrap
          is old code, not really maintained anymore and has serious
          shortcomings, and better options such as firewalls
          exist. For setups that require tcpwrap usage, please
          consider invoking your socket-activated service via tcpd,
          like on traditional inetd.

        * A new system.conf configuration option
          DefaultTimerAccuracySec= has been added that controls the
          default AccuracySec= setting of .timer units.

        * Timer units gained a new WakeSystem= switch. If enabled
          timers configured this way will cause the system to resume
          from system suspend (if the system supports that, which most
          do these days).

        * Timer units gained a new Persistent= switch. If enabled
          timers configured this way will save to disk when they have
          been last triggered. This information is then used on next
          reboot to possible execute overdue timer events, that
          couldn't take place because the system was powered off. This
          enables simple anacron-like behaviour for timer units.

        * systemctl's "list-timers" will now also list the time a
          timer unit was last triggered in addition to the next time
          it will be triggered.

        * systemd-networkd will now assign predictable IPv4LL
          addresses to its local interfaces.

        Contributions from: Brandon Philips, Daniel Buch, Daniel Mack,
        Dave Reisner, David Herrmann, Gerd Hoffmann, Greg
        Kroah-Hartman, Hendrik Brueckner, Jason St. John, Josh
        Triplett, Kay Sievers, Lennart Poettering, Marc-Antoine
        Perennou, Michael Marineau, Michael Olbrich, Miklos Vajna,
        Patrik Flykt, poma, Sebastian Thorarensen, Thomas Bächler,
        Thomas Hindoe Paaboel Andersen, Tomasz Torcz, Tom Gundersen,
        Umut Tezduyar Lindskog, Wieland Hoffmann, Zbigniew

        -- Berlin, 2014-03-25

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