Re: We want to stop systemd from being added to docker images, because of rpm requiring systemctl.

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On tis, 2014-04-29 at 17:40 +0200, Lennart Poettering wrote:
> On Tue, 29.04.14 16:58, Alexander Larsson (alexl@xxxxxxxxxx) wrote:
> 
> > On tis, 2014-04-29 at 12:33 +0200, Lennart Poettering wrote:
> > > On Mon, 28.04.14 17:01, Daniel J Walsh (dwalsh@xxxxxxxxxx) wrote:
> > > 
> > > > The problem  is lots of services require systemd because they ship a
> > > > unit file and want systemctl reload to happen.  Systemd then triggers a
> > > > require for udev and kmod, which docker containers do not need.
> > > 
> > > If you discount the docs/man pages of the RPMs, how much does kmod,
> > > udev, systemd actually contribtue in bytes to your docker images?
> > 
> > Its around 15 megs or so, although on rhel7 its 20 megs larger because
> > of a dependency that kmod has on /usr/bin/nm (binutils) that doesn't
> > seem to be there on fedora kmod. This seems like a bug in fedora though,
> > as kmod ships /usr/sbin/weak-modules which calls nm, so once fixed
> > fedora would be at 35 meg too.
> 
> I am pretty sure that the weak-modules thing should just go. It's
> outdated cruft, for some enterprise thing, and inused in Fedora. I'd
> really recommend to just drop it from the Fedora package...
> 
> > But, even if the size is small that is not the full picture. There are a
> > bunch of dependencies like dbus (the daemon), device-mapper, kmod, and
> > iptables that are recursively pulled in by systemd that don't really
> 
> device-mapper? iptables? That sounds wrong... Any idea how that gets
> pulled in? the dm libs might get pulled in indirectly via libcryptsetup,
> but the other dm tools really shouldn't be. And iptables i really don't
> see how that's pulled in?

systemd => cryptsetup-libs => device-mapper-libs => device-mapper

Don't have time to look up the details atm, but iptable was reached via
initscripts somehow.


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