netdev - Re: [PATCH 2/2] net: Implement SO_PASSCGROUP to enable passing cgroup path

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Date:	Wed, 23 Apr 2014 11:07:44 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Simo Sorce <ssorce@...hat.com>, Daniel J Walsh <dwalsh@...hat.com>,
	David Miller <davem@...emloft.net>, Tejun Heo <tj@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	lpoetter@...hat.com, cgroups@...r.kernel.org, kay@...hat.com,
	Network Development <netdev@...r.kernel.org>
Subject: Re: [PATCH 2/2] net: Implement SO_PASSCGROUP to enable passing
 cgroup path

On Mon, Apr 21, 2014 at 08:47:51AM -0700, Andy Lutomirski wrote:

[..]
> To summarize from my reading of how this crap words:
> 
> When a unit is created, systemd opens a stream socket pointing at
> /run/systemd/journal/stdout.  It tells journald the unit, along with
> lots of other useful information.  journald records this association
> between the socket and the unit.  Systemd could tell journald the
> cgroup here, too, if it wanted it.

Ok, that's a fair point. I looked at  connect_logger_as() and I see
that systemd does connect() on behalf of service being launched and
sets up fd and passes bunch of information to journald. So cgroup could
be one of the information and that would act like SO_PEERCGROUP in
this specific case. Not sure why it is not done though. I will let
systemd folks comment on that. I don't have enough background here.

But this works in this specific case where there is a mechanism to 
pass meta information to receiver. What about SSSD use case where 
they want to know the cgroup of client and possibly provide differentiated
service based on client.

Also Dan Walsh mentioned that what if a process directly wants to open
journal socket and log something to journal. 

Thanks
Vivek
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