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Jeremy Sutherland, 07/07/2011 01:13 am


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"systemd" usage on SourceMage Gnu/Linux,

This is a braindump by Jeremy Kajikawa to describe the layout provided as a template and explain
  what is essential along with various notes describing some of the provisions of systemd configs on SMGL

The spell was created on request and requires the following configuration settings to be dealt with
  before becoming the system wide init daemon

After casting the "systemd" spell,
  Edit /etc/systemd/systemd.conf for any daemon options you wish to use
  (these are overridden by being given as kernel boot options :)

You may need to cast udev and dbus if they are not force-recast by the systemd spell (this is a planned ToDo)
  this will install the proper configurations for these two dependencies.

You will then have to modify any configuration of the /etc/systemd/system/ content to suite what you want to run.

  The following *.target files are essentials and are not the only targets available

  basic cryptsetup emergency final getty graphical halt kexec local-fs multi-user network nss-lookup poweroff
  reboot remote-fs rescue rpcbind rtc-set shutdown sigpwr sockets sound swap sysinit syslog umount  

  To run any services you need the appropriate .service files...
    and any @.service files will trigger xinetd behaviours (making xinetd itself optional after this is working) 

  Some of the .target files also have .wants folders... these are for extending the service or target
    to run extra services...

  Examples from my own system are...[pathing relative to /etc/systemd/system/]

  "graphical.target.wants/dm.service" is a symlink to "lxdm.service" 

  "network.target.wants/sshd.service" is a symlink to "sshd.service" forcing sshd to run at boot instead of on-demand
    as there is also a provision of "sshd@.service" which allows sshd logins to occur on-demand (socket access)
    instead of running everything at the system launch

  Network-Manager is recommended to be installed but you also have wicd as an alternative...
    for handling network connections with your own script able to be wrapped with a config entry to be called
    prior to the network.target starting any services required

  I additionally symlinked "multi-user.target.wants/network.target" to "network.target" forcing the network dependency
    for a full multi-user enabled system and graphical.target also inherently depends on the multi-user.target 

  Additionally the following two Symlinks are *mandatory*

  To Enable support of the Three-Finger-Salute of Control with Alt and Delete
    ctrl-alt-del.target -> reboot.target

  To Select what system configuration actually gets booted
    default.target -> graphical.target

  **You can change the default.target to symlink to multi-user.target if you do not want an X login**

  For SysV init compatability you can either create or symlink the following entries...symlinking is easier

    runlevel0.target -> poweroff.target
    runlevel1.target -> rescue.target
    runlevel2.target -> multi-user.target
    runlevel3.target -> multi-user.target
    runlevel4.target -> multi-user.target
    runlevel5.target -> graphical.target
    runlevel6.target -> reboot.target

  **these are recommendation only and are subject to your own whims for the multi-user and graphical target levels**

  You can also clearly see examples for additional configuration materials online and in the template materials
    [the current SourceMage "imp-data-systemd"/template/ is actually a snapshot from my(J.Kajikawa's) running system]

  Please feel free to change Display Manager and other runtime services that you want to use as you see fit,
    I know you will anyway... and there is plenty of documentation and examples...

  The systemd development team is also providing various configuration options to upstream packages as well...
    so what I have available as a template will slowly be less and less needed beyond initial setup.