netdev - Re: [PATCH v5 0/6] Add eBPF hooks for cgroups

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Date:   Wed, 14 Sep 2016 11:03:49 +0200
From:   Thomas Graf <tgraf@...g.ch>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Pablo Neira Ayuso <pablo@...filter.org>,
        Daniel Mack <daniel@...que.org>, htejun@...com,
        daniel@...earbox.net, ast@...com, davem@...emloft.net,
        kafai@...com, fw@...len.de, harald@...hat.com,
        netdev@...r.kernel.org, sargun@...gun.me, cgroups@...r.kernel.org
Subject: Re: [PATCH v5 0/6] Add eBPF hooks for cgroups

[Sorry for the repost, gmail decided to start sending HTML crap along
 overnight for some reason]

On 09/13/16 at 09:42pm, Alexei Starovoitov wrote:
> On Tue, Sep 13, 2016 at 07:24:08PM +0200, Pablo Neira Ayuso wrote:
> > Then you have to explain me how can anyone else than systemd use this
> > infrastructure?
> 
> Jokes aside. I'm puzzled why systemd is even being mentioned here.
> Here we use tupperware (our internal container management system) that
> is heavily using cgroups and has nothing to do with systemd.

Just confirming that we are planning to use this decoupled from
systemd as well.  I fail to see how this is at all systemd specific.

> For us this cgroup+bpf is _not_ for filterting and _not_ for security.
> We run a ton of tasks in cgroups that launch all sorts of
> things on their own. We need to monitor what they do from networking
> point of view. Therefore bpf programs need to monitor the traffic in
> particular part of cgroup hierarchy. Not globally and no pass/drop decisions.

+10, although filtering/drop is a valid use case, the really strong
use case is definitely introspection at networking level. Statistics,
monitoring, verification of application correctness, etc. 

I don't see why this is at all an either or discussion. If nft wants
cgroups integration similar to this effort, I see no reason why that
should stop this effort.