[sf-lug] systemd criticism

[GMail]

so, what happens if you kill -9 pid #1??

i know my syntax is off but you understand what i meant  

Sent from Dan.

> On Aug 27, 2014, at 18:59, Rick Moen <rick at linuxmafia.com> wrote:
> 
> Quoting Jim Stockford (jim at well.com):
> 
>> I think of the kernel as process 0 and init as process 1.  I read the
>> Wikipedia excerpt as systemd replacing init, i.e.  systemd has process
>> ID 1 and init need not apply.
> 
> Not quite right.  'init' is a Unix system _role_ aka system function
> -- involving at minimum being process #1, the ancestor of all other
> userspace processes -- a role that can be filled by any of a number of
> alternatively usable pieces of software.
> 
> The specifc init installed by default in most Linux distros over the past
> two decades is one that closely follows the design used in AT&T System V
> Unix, hence that init's name, SysVInit.  It's a small, extremely well
> debugged, deliberately modest-featured binary compiled from C source.
> There have always been some Linux distros that default to a different
> init, as Slackware does.  And there are a number of other inits used
> by non-typical distros by default, e.g., Gentoo Linux defaults to using
> one called OpenRC.
> 
> (Note the term 'default':  Distros often offer a choice among several
> inits that they package.)
> 
> SysVInit's 'init' binary is always /sbin/init, but there's no reason why
> some other init mightn't use that file location as well.  Or the
> alternative init package might turn /sbin/init into a symbolic link
> pointing to its binary elsewhere.
> 
> The BSDs (and Slackware) default to an init somewhat different from
> SysVInit, one logically enough called BSD init.  Recent Solaris releases
> switched from SysVInit to Sun Microsystems's SMF = Service Management
> Facility.  Ubuntu is at the moment using Scott James Remnant's 'Upstart'
> as that distro's default init.  Apple Macinitosh OS X uses launchd,
> after for many releases relying on program launcher SystemStarter
> started from a BSD init.
> 
> Init processes differ widely in the scope of what system management
> tasks they take on:  Some are featureful, others not.  They also differ 
> widely in their dependencies, e.g., Upstart and systemd require D-Bus
> inter-process communication, and systemd is tied to a number of
> facilities available only with the Linux kernel (e.g., udev).
> 
> 
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