Systemd is a system and session manager for Linux that is compatible with SysV and LSB init scripts. It provides aggressive parallelization capabilities, uses socket and D-Bus activation for starting services, offers on-demand starting of daemons, and keeps track of processes using Linux cgroups. Systemd implements an elaborate transactional dependency-based service control logic and can work as a drop-in replacement for sysvinit.

1. Beyond Init: systemd
LinuxKongress 2010
Lennart Poettering
lennart@poettering.net
September 2010
Lennart Poettering Beyond Init: systemd

2. Who Am I?
Software Engineer at Red Hat, Inc.
Developer of PulseAudio, Avahi and a few other Free Software
projects
http://0pointer.de/lennart/
lennart@poettering.net
IRC: mezcalero
Lennart Poettering Beyond Init: systemd

3. systemd is a system and session manager for Linux,
Lennart Poettering Beyond Init: systemd

4. systemd is a system and session manager for Linux, compatible
with SysV and LSB init scripts.
Lennart Poettering Beyond Init: systemd

5. systemd is a system and session manager for Linux, compatible
with SysV and LSB init scripts. systemd provides aggressive
parallelization capabilities,
Lennart Poettering Beyond Init: systemd

6. systemd is a system and session manager for Linux, compatible
with SysV and LSB init scripts. systemd provides aggressive
parallelization capabilities, uses socket and D-Bus activation for
starting services,
Lennart Poettering Beyond Init: systemd

7. systemd is a system and session manager for Linux, compatible
with SysV and LSB init scripts. systemd provides aggressive
parallelization capabilities, uses socket and D-Bus activation for
starting services, oers on-demand starting of daemons,
Lennart Poettering Beyond Init: systemd

8. systemd is a system and session manager for Linux, compatible
with SysV and LSB init scripts. systemd provides aggressive
parallelization capabilities, uses socket and D-Bus activation for
starting services, oers on-demand starting of daemons, keeps
track of processes using Linux cgroups,
Lennart Poettering Beyond Init: systemd

9. systemd is a system and session manager for Linux, compatible
with SysV and LSB init scripts. systemd provides aggressive
parallelization capabilities, uses socket and D-Bus activation for
starting services, oers on-demand starting of daemons, keeps
track of processes using Linux cgroups, supports snapshotting and
restoring of the system state,
Lennart Poettering Beyond Init: systemd

10. systemd is a system and session manager for Linux, compatible
with SysV and LSB init scripts. systemd provides aggressive
parallelization capabilities, uses socket and D-Bus activation for
starting services, oers on-demand starting of daemons, keeps
track of processes using Linux cgroups, supports snapshotting and
restoring of the system state, maintains mount and automount
points
Lennart Poettering Beyond Init: systemd

11. systemd is a system and session manager for Linux, compatible
with SysV and LSB init scripts. systemd provides aggressive
parallelization capabilities, uses socket and D-Bus activation for
starting services, oers on-demand starting of daemons, keeps
track of processes using Linux cgroups, supports snapshotting and
restoring of the system state, maintains mount and automount
points and implements an elaborate transactional
dependency-based service control logic.
Lennart Poettering Beyond Init: systemd

12. systemd is a system and session manager for Linux, compatible
with SysV and LSB init scripts. systemd provides aggressive
parallelization capabilities, uses socket and D-Bus activation for
starting services, oers on-demand starting of daemons, keeps
track of processes using Linux cgroups, supports snapshotting and
restoring of the system state, maintains mount and automount
points and implements an elaborate transactional
dependency-based service control logic. It can work as a drop-in
replacement for sysvinit.
Lennart Poettering Beyond Init: systemd

13. init(8)
Lennart Poettering Beyond Init: systemd

14. Parallelization
Lennart Poettering Beyond Init: systemd

15. Lennart Poettering Beyond Init: systemd

16. Socket-Based Activation
Lennart Poettering Beyond Init: systemd

17. Socket-Based Activation
The kernel orders and buers requests for us!
Lennart Poettering Beyond Init: systemd

18. Socket-Based Activation
The kernel orders and buers requests for us!
Implicit dependencies!
Lennart Poettering Beyond Init: systemd

19. Socket-Based Activation
The kernel orders and buers requests for us!
Implicit dependencies!
Patching daemons
Lennart Poettering Beyond Init: systemd

20. Bus-Based Activation
Lennart Poettering Beyond Init: systemd

21. Starting Less: On-Demand Loading
Lennart Poettering Beyond Init: systemd

22. Parallelizing File System Jobs
Lennart Poettering Beyond Init: systemd

23. Parallelizing File System Jobs
autofs!
Lennart Poettering Beyond Init: systemd

24. Shell is evil
Lennart Poettering Beyond Init: systemd

25. Shell is evil
Move to systemd, daemons, kernel, udev, . . .
Lennart Poettering Beyond Init: systemd

26. Shell is evil
Move to systemd, daemons, kernel, udev, . . .
Provide proper debugging facilities
Lennart Poettering Beyond Init: systemd

27. The best babysitter.
Lennart Poettering Beyond Init: systemd

28. The best babysitter.
Control Groups!
Lennart Poettering Beyond Init: systemd

29. The best babysitter II
Lennart Poettering Beyond Init: systemd

30. The best babysitter II
Environment, resource limits, working directory, chroot(), umask,
OOM adjustment, nice level, IO priority and class, CPU scheduler
priority and policy/reset-on-fork, CPU anity, timer slack, stdio to
syslog/tty/null/kmsg, uid, gid, supplementary groups,

31. le system
namespacing (r/o

32. le systems, inaccessible systems, mount
propagation, private /tmp), capabilities (inherited set, bounding
set, secure bits), . . .
Lennart Poettering Beyond Init: systemd

33. Unit types: service, socket, device, mount, automount, target,
snapshot, timer, swap, path
Lennart Poettering Beyond Init: systemd

34. Don't reinvent the wheel:
Lennart Poettering Beyond Init: systemd

35. Don't reinvent the wheel:
Read SysV/LSB init script headers, read /etc/fstab, support
traditional inetd modes, support /dev/initctl, utmp, wtmp,
support double-fork()ing daemons.
Lennart Poettering Beyond Init: systemd

36. Don't reinvent the wheel:
Read SysV/LSB init script headers, read /etc/fstab, support
traditional inetd modes, support /dev/initctl, utmp, wtmp,
support double-fork()ing daemons.
.desktop

37. les.
Lennart Poettering Beyond Init: systemd

38. Snapshots
Lennart Poettering Beyond Init: systemd

39. Transaction System
Lennart Poettering Beyond Init: systemd

40. D-Bus!
Lennart Poettering Beyond Init: systemd

41. systemadm
Lennart Poettering Beyond Init: systemd

42. systemd as basic OS building block
Lennart Poettering Beyond Init: systemd

43. systemd as basic OS building block
systemd for cross-distribution standardization
Lennart Poettering Beyond Init: systemd

44. systemd in the distributions
Lennart Poettering Beyond Init: systemd

45. Future: managing sessions
Lennart Poettering Beyond Init: systemd

46. Say No! to Copyright Assignment.
Lennart Poettering Beyond Init: systemd

47. That's all, folks.
Lennart Poettering Beyond Init: systemd

48. That's all, folks.
Any questions?
Lennart Poettering Beyond Init: systemd

49. systemd
http://www.freedesktop.org/wiki/Software/systemd
http://0pointer.de/blog/projects/systemd
git://anongit.freedesktop.org/systemd
#systemd on irc.freenode.org
Lennart Poettering Beyond Init: systemd