Linux command comparison

Michael Torrie torriem at chem.byu.edu
Fri Dec 8 09:48:53 MST 2006


On Fri, 2006-12-08 at 06:56 -0700, Hans Fugal wrote:
> I heartily agree, although it bears mentioning that some distros are
> making the long-overdue migration away from System V init schemes (the
> symlinks in /etc/rc.d or similar places) to something better. e.g.
> Ubunutu is using upstart, which looks very cool, and Debian has optional
> support for upstart and other systems like runit.

For a desktop distro this is probably a good idea, but for servers,
nothing beats System V in my opinion.  Having well-defined custom
runlevels (something most of us probably should do but don't) allows for
much better system administration.  For example, if your server
applications are layered, you can use runlevels to add layers in a
controlled fashion.  Runlevel 5 could be everything up full, and
runlevel 4 could be everything but the web interface, runlevel 3 could
be just the sql server running, and runlevel 2 could be standard
multi-user, network, but the apps are shut down for maintenance.  

Having messed with Tiger's new LaunchDaemon, I can see some definitely
benefits to it over the older pseudo-rc system.  But it seems to not
have any real concept of runlevels, although there Mac does support a
single-user mode, so I don't know how it fits in.

Michael

> 
> In any case, get under the hood. A good excercise is to manually walk
> through everything that happens at boot until your gui or login prompt
> pops up. It will take some googling and asking, bu it will be
> enlightening!


> 
> On Fri,  8 Dec 2006 at 00:42 -0700, Alex Esplin wrote:
> > On 12/8/06, Doran Barton <fozz at iodynamics.com> wrote:
> > >Even though tools exist on different distributions (chkconfig for
> > >RH/Mandriva, update-rc.d on Debian(isms), yast on SUSE), they all do mostly
> > >the same dang thing: maintain symbolic links between files in /etc/init.d 
> > >(or
> > >/etc/rc.d/init.d) and the run level directories init scripts process for 
> > >the
> > >respective run level.
> > >
> > >If you learn about the fundamental activity these tools are doing, the 
> > >tools
> > >themselves are just convenience. Knowing what's going on behind the scenes,
> > >you can pretty much manage anything on any of the distributions.
> > 
> > I would tend to agree fairly strongly on this.  Not that I am making
> > any claims to knowing anything, but after using Gentoo for a while, I
> > know a heck of a lot more about other distributions than I did before.
> > So pick your favorite distro and do some digging into how it handles
> > all of that stuff, and most of that knowledge will carry over.
> > 
> > -- 
> > Alex Esplin
> > 
> > /*
> > PLUG: http://plug.org, #utah on irc.freenode.net
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> > 
> 
> /*
> PLUG: http://plug.org, #utah on irc.freenode.net
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