From: Pandu Poluan <pandu@poluan.info>
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user] Re: systemd? [ Was: The End Is Near ... ]
Date: Sun, 18 Mar 2012 09:20:02 +0700 [thread overview]
Message-ID: <CAA2qdGUf8JDopUoFjs_zce2xHh0PDy36Qfdzr1kXTJ=GmoEbGA@mail.gmail.com> (raw)
In-Reply-To: <CADPrc80qcOhyQy8SPmpYbp8vrO6y_H2hg6x594fjoub7hWEvkg@mail.gmail.com>
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On Mar 18, 2012 8:48 AM, "Canek Peláez Valdés" <caneko@gmail.com> wrote:
>
> On Sat, Mar 17, 2012 at 6:48 PM, Nikos Chantziaras <realnc@gmail.com>
wrote:
> > On 17/03/12 13:53, Alan Mackenzie wrote:
> >>
> >> Hello, Nikos.
> >>
> >> On Sat, Mar 17, 2012 at 08:25:48AM +0200, Nikos Chantziaras wrote:
> >>
> >>>> Happy Computer Users, systemd is on your horizon.
> >>
> >>
> >>> No, we don't. I hope systemd arrives soon. It's the best init
system I
> >>> ever saw.
> >>
> >>
> >> What's so good about it? What will it do for me?
> >>
> >> I have this horrible sneaking suspicion that it will be more
complicated
> >> than /sbin/init + OpenRC, just like udev + initramfs is more
complicated
> >> than udev, and CUPS is more complicated than classical lpr.
> >>
> >> Why do you find it so good?
> >
> >
> > No idea. I only posted this because the OP didn't say what's bad about
> > systemd :-) I really don't know I should care whether my system runs
OpenRC
> > or systemd.
>
> Take this with a grain (or a kilo) of salt, since I'm obviously
> biased, but IMHO this are systemd advantages over OpenRC:
>
> * Really fast boot. OpenRC takes at least double the time that systemd
> does when booting, easily verifiable. In my laptop systemd is twice as
> fast as OpenRC; in my desktop is three times faster.
>
> * Really parallel service startup: OpenRC has never been reliable on
> parallel service startup; its documentation says it explicitly.
>
> * Really simple service unit files: The service unit files are really
> small, really simple, really easy to understand/modify. Compare the 9
> lines of sshd.service:
>
> $ cat /etc/systemd/system/sshd.service
> [Unit]
> Description=SSH Secure Shell Service
> After=syslog.target
>
> [Service]
> ExecStart=/usr/sbin/sshd -D
>
> [Install]
> WantedBy=multi-user.target
>
> with the 84 of /etc/init.d/sshd (80 without comments).
>
> * Really good documentation: systemd has one of the best
> documentations I have ever seen in *any* project. Everything (except
> really new, experimental features) is documented, with manual pages
> explaining everything. And besides, there are blog posts by Lennart
> explaining in a more informal way how to do neat tricks with systemd.
>
> * Really good in-site customization: The service unit files are
> trivially overrided with custom ones for specific installations,
> without needing to touch the ones installed by systemd or a program.
> With OpenRC, if I modify a /etc/init.d file, chances are I need to
> check out my next installation so I can see how the new file differs
> from the old one, and adapt the changes to my customized version.
>
> * All the goodies from Control Groups: You can use kernel cgroups to
> monitor/control several properties of your daemons, out of the box,
> almost no admin effort involved.
>
> * It tries to unify Linux behaviour among distros (some can argue that
> this is a bad thing): Using systemd, the same
> configurations/techniques work the same in every distribution. No more
> need to learn /etc/conf.d, /etc/sysconfig, /etc/default hacks by
> different distros.
>
> * Finally, and what I think is the most fundamental difference between
> systemd and almost any other init system: The service unit files in
> systemd are *declarative*; you tell the daemon *what* to do, not *how*
> to do it. If the service files are shell scripts (like in
> OpenRC/SysV), everything can spiral out of control really easily. And
> it usually does (again, look at sshd; and that one is actully nicely
> written, there are all kind of monsters out there abusing the power
> that shell gives you).
>
> These are the ones off the top of my head; but what I like the most
> about systemd is that it just works, and that it makes a lot of sense
> (at least to me).
>
> Most of systemd features can be implemented in OpenRC (although the
> speed difference will never be eliminated if OpenRC keeps using shell
> files). My question is: why bother? systemd is already here, it
> already works, and it's actually supported in Gentoo.
>
> But again, remember that I'm biased: I keep an overlay to run Gentoo
> systems with only systemd; no OpenRC, no baselayout, no SysV. You guys
> can try it if you want:
>
> http://xochitl.matem.unam.mx/~canek/gentoo-systemd-only/
>
> Usual disclaimer: I take no responsibility if using my overlay results
> in your systems asploding. That said, I'm using it on all my machines
> without a hitch.
>
> Regards.
Interesting...
However, what if the service is complex? For example, I created a
"gatewall" service which, upon boot, initializes :
* Routing tables and the RPDB
* ipset
* iptables
while ensuring that upon shutdown, the settings of the above are
(optionally) saved.
How do I specify such intelligence?
Rgds,
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next prev parent reply other threads:[~2012-03-18 2:22 UTC|newest]
Thread overview: 110+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-17 4:11 [gentoo-user] The End Is Near ... or, get the vaseline, they're on the way! Bruce Hill, Jr.
2012-03-17 4:19 ` Canek Peláez Valdés
2012-03-17 4:37 ` Bruce Hill, Jr.
2012-03-17 4:53 ` Canek Peláez Valdés
2012-03-17 5:19 ` Pandu Poluan
2012-03-17 6:25 ` [gentoo-user] " Nikos Chantziaras
2012-03-17 11:53 ` [gentoo-user] systemd? [ Was: The End Is Near ... ] Alan Mackenzie
2012-03-18 0:48 ` [gentoo-user] " Nikos Chantziaras
2012-03-18 1:45 ` Canek Peláez Valdés
2012-03-18 2:12 ` Nikos Chantziaras
2012-03-18 2:41 ` Joshua Murphy
2012-03-18 2:52 ` Pandu Poluan
2012-03-18 2:20 ` Pandu Poluan [this message]
2012-03-18 2:30 ` Canek Peláez Valdés
2012-03-18 3:02 ` Bruce Hill, Jr.
2012-03-18 3:27 ` Canek Peláez Valdés
2012-03-18 8:02 ` Graham Murray
2012-03-18 8:49 ` Canek Peláez Valdés
2012-03-18 11:23 ` Pandu Poluan
2012-03-18 19:25 ` Canek Peláez Valdés
2012-03-18 19:48 ` Michael Mol
2012-03-18 19:54 ` Alan McKinnon
2012-03-18 19:59 ` Frank Steinmetzger
2012-03-19 13:33 ` Neil Bothwick
2012-03-19 13:57 ` Michael Mol
2012-03-18 13:15 ` Alan McKinnon
2012-03-18 13:56 ` Dale
2012-03-18 22:23 ` Walter Dnes
2012-03-18 22:35 ` Alan McKinnon
2012-03-19 22:58 ` Walter Dnes
2012-03-19 23:18 ` Alan McKinnon
2012-03-21 4:40 ` Walter Dnes
2012-03-21 14:29 ` Alan McKinnon
2012-03-21 16:02 ` Michael Mol
2012-03-21 22:55 ` Walter Dnes
2012-03-22 1:35 ` Michael Mol
2012-03-22 21:13 ` Walter Dnes
2012-03-22 22:07 ` Mike Edenfield
2012-03-23 1:27 ` Michael Mol
2012-03-29 6:52 ` J. Roeleveld
2012-03-19 13:30 ` Neil Bothwick
2012-03-18 2:48 ` Bruce Hill, Jr.
2012-03-18 2:57 ` Canek Peláez Valdés
2012-03-18 4:17 ` Bruce Hill, Jr.
2012-03-18 7:28 ` Canek Peláez Valdés
2012-03-19 13:20 ` Eliezer Croitoru
2012-03-19 13:49 ` Alex Schuster
2012-03-19 13:13 ` Neil Bothwick
2012-03-19 14:33 ` Bruce Hill, Jr.
2012-03-19 23:11 ` Neil Bothwick
2012-03-17 8:00 ` [gentoo-user] The End Is Near ... or, get the vaseline, they're on the way! Andrea Conti
2012-03-17 12:03 ` Bruce Hill, Jr.
2012-03-19 13:17 ` Neil Bothwick
2012-03-19 13:27 ` Mark Knecht
2012-03-19 23:04 ` Alan McKinnon
2012-03-19 23:33 ` Neil Bothwick
2012-03-19 23:49 ` Alan McKinnon
2012-03-20 1:13 ` wdk@moriah
2012-03-20 8:41 ` Neil Bothwick
2012-03-17 11:59 ` Alan Mackenzie
2012-03-17 12:05 ` Bruce Hill, Jr.
2012-03-17 12:50 ` Tanstaafl
2012-03-17 12:54 ` Eliezer Croitoru
2012-03-17 14:03 ` Peter Humphrey
2012-03-18 9:52 ` Dale
2012-03-18 18:01 ` Eliezer Croitoru
2012-03-18 20:39 ` Dale
2012-03-18 22:28 ` Alan McKinnon
2012-03-19 0:30 ` Canek Peláez Valdés
2012-03-19 2:03 ` William Kenworthy
2012-03-19 13:40 ` Eliezer Croitoru
2012-03-19 13:56 ` Alex Schuster
2012-03-29 9:35 ` [gentoo-user] chicken/eff issue with suspend-to-disk/hibernate problem [Was: The End Is Near ... or, get the vaseline, they're on the way!] J. Roeleveld
2012-03-29 10:40 ` wdk@moriah
2012-03-29 13:51 ` J. Roeleveld
2012-03-29 14:04 ` Neil Bothwick
2012-03-29 23:05 ` wdk@moriah
2012-03-18 17:30 ` [gentoo-user] The End Is Near ... or, get the vaseline, they're on the way! Tanstaafl
2012-03-17 14:08 ` Jarry
2012-03-19 13:25 ` Neil Bothwick
2012-03-17 15:10 ` Mark Knecht
2012-03-17 17:36 ` Canek Peláez Valdés
2012-03-17 17:58 ` Mark Knecht
2012-03-17 18:38 ` Volker Armin Hemmann
2012-03-17 19:40 ` pk
2012-03-17 20:09 ` Volker Armin Hemmann
2012-03-17 20:28 ` pk
2012-03-18 9:51 ` Dale
2012-03-18 13:03 ` Alan McKinnon
2012-03-18 13:52 ` Dale
2012-03-19 13:22 ` Neil Bothwick
2012-03-18 11:44 ` [gentoo-user] " walt
2012-03-17 20:15 ` [gentoo-user] " Alan McKinnon
2012-03-18 0:43 ` Mark Knecht
2012-03-18 2:18 ` William Kenworthy
2012-03-18 3:57 ` Bruce Hill, Jr.
2012-03-18 6:30 ` Michael Mol
2012-03-18 7:26 ` Bruce Hill, Jr.
2012-03-18 7:54 ` Michael Mol
2012-03-18 12:01 ` Bruce Hill, Jr.
2012-03-18 12:47 ` Volker Armin Hemmann
2012-03-18 13:23 ` Bruce Hill, Jr.
2012-03-18 14:08 ` Volker Armin Hemmann
2012-03-18 13:29 ` Mark Knecht
2012-03-18 17:38 ` Tanstaafl
2012-03-29 9:48 ` J. Roeleveld
2012-03-18 13:27 ` Mark Knecht
2012-03-17 23:02 ` [gentoo-user] " »Q«
2012-03-18 8:16 ` [gentoo-user] " Walter Dnes
2012-03-19 9:48 ` Helmut Jarausch
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