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systemd Status Update

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It has been a while since my last status update on systemd. Here's another short, incomprehensive status update on what we worked on for systemd since then.

  • Fedora F15 (Rawhide) now includes a split up /etc/init.d/rc.sysinit (Bill Nottingham). This allows us to keep only a minimal compatibility set of shell scripts around, and boot otherwise a system without any shell scripts at all. In fact, shell scripts during early boot are only used in exceptional cases, i.e. when you enabled autoswapping (bad idea anyway), when a full SELinux relabel is necessary, during the first boot after initialization, if you have static kernel modules to load (which are not configured via the systemd-native way to do that), if you boot from a read-only NFS server, or when you rely on LVM/RAID/Multipath. If nothing of this applies to you can easily disable these parts of early boot and save several seconds on boot. How to do this I will describe in a later blog story.

  • We have a fully C coded shutdown logic that kills all remaining processes, unmounts all remaining file systems, detaches all loop devices and DM volumes and does that in the right way to ensure that all these things are properly teared down even if they depend on each other in arbitrary ways. This is not only considerably faster then the traditional shell hackery for this, but also a lot safer, since we try to unmount/remount the remaining file systems with a little bit of brains. This feature is available via systemctl --force poweroff to the administrator. The --force controls whether the usual shutdown of all services is run or whether this is skipped and we immediately shall enter this final C shutdown logic. Using --force hence is a much safer replacement for the old /sbin/reboot -f and does not leave dirty file systems behind. (Thanks to Fabiano Fidencio has his colleagues from ProFUSION for this).

rest here

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