Re: [RFC][PATCH 0/9] Make containers kernel objects

From	ebiederm@xmission.com (Eric W. Biederman)
Newsgroups	linux.kernel
Subject	Re: [RFC][PATCH 0/9] Make containers kernel objects
Date	2017-05-23 17:30 +0200
Message-ID	<tKjV0-51B-25@gated-at.bofh.it> (permalink)
References	(1 earlier) <tJZ9U-8vX-7@gated-at.bofh.it> <tJYnv-80c-3@gated-at.bofh.it> <tJYQy-8az-29@gated-at.bofh.it> <tKjrY-4z9-23@gated-at.bofh.it> <tKjLl-4VL-33@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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David Howells <dhowells@redhat.com> writes:

> Eric W. Biederman <ebiederm@xmission.com> wrote:
>
>> > As an example, I could set up a client machine with two ethernet ports,
>> > set up two DNS+NFS servers, each of which think they're called "foo.bar"
>> > and attach each server to a different port on the client machine.  Then I
>> > could create a pair of containers on the client machine and route the
>> > network in each container to a different port.  Now there's a problem
>> > because the names of the cached DNS records for each port overlap.
>> 
>> Please look at ip netns add.
>
> 	warthog>man ip | grep setns
> 	warthog1>

Not setns netns


>> It does solve this in userspace rather simply.
>
> Ummm...  How?  The kernel DNS resolver is not namespace aware.

But it works fine if called in the proper context and we have a defacto
standard for where to put all of the files (the tricky part) if you are
dealing with multiple network namespaces simultaneously.

Eric

Thread

[RFC][PATCH 0/9] Make containers kernel objects David Howells <dhowells@redhat.com> - 2017-05-22 18:30 +0200
  [PATCH 8/9] Honour CONTAINER_NEW_EMPTY_FS_NS David Howells <dhowells@redhat.com> - 2017-05-22 18:30 +0200
  [PATCH 3/9] Provide /proc/containers David Howells <dhowells@redhat.com> - 2017-05-22 18:30 +0200
  Re: [RFC][PATCH 0/9] Make containers kernel objects James Bottomley <James.Bottomley@HansenPartnership.com> - 2017-05-22 19:00 +0200
    Re: [RFC][PATCH 0/9] Make containers kernel objects Aleksa Sarai <asarai@suse.de> - 2017-05-22 19:20 +0200
      Re: [RFC][PATCH 0/9] Make containers kernel objects David Howells <dhowells@redhat.com> - 2017-05-23 17:00 +0200
        Re: [RFC][PATCH 0/9] Make containers kernel objects ebiederm@xmission.com (Eric W. Biederman) - 2017-05-23 17:10 +0200
          Re: [RFC][PATCH 0/9] Make containers kernel objects David Howells <dhowells@redhat.com> - 2017-05-23 17:20 +0200
            Re: [RFC][PATCH 0/9] Make containers kernel objects ebiederm@xmission.com (Eric W. Biederman) - 2017-05-23 17:30 +0200
              Re: [RFC][PATCH 0/9] Make containers kernel objects James Bottomley <James.Bottomley@HansenPartnership.com> - 2017-05-23 17:50 +0200
                Re: [RFC][PATCH 0/9] Make containers kernel objects David Howells <dhowells@redhat.com> - 2017-05-23 18:40 +0200
                Re: [RFC][PATCH 0/9] Make containers kernel objects ebiederm@xmission.com (Eric W. Biederman) - 2017-05-24 10:40 +0200
                Re: [RFC][PATCH 0/9] Make containers kernel objects Ian Kent <raven@themaw.net> - 2017-05-24 11:20 +0200
    Re: [RFC][PATCH 0/9] Make containers kernel objects Jessica Frazelle <me@jessfraz.com> - 2017-05-22 19:30 +0200
    Re: [RFC][PATCH 0/9] Make containers kernel objects Jeff Layton <jlayton@redhat.com> - 2017-05-22 20:40 +0200
      Re: [RFC][PATCH 0/9] Make containers kernel objects James Bottomley <James.Bottomley@HansenPartnership.com> - 2017-05-22 21:30 +0200
        Re: [RFC][PATCH 0/9] Make containers kernel objects Jeff Layton <jlayton@redhat.com> - 2017-05-23 00:20 +0200
        Re: [RFC][PATCH 0/9] Make containers kernel objects Ian Kent <raven@themaw.net> - 2017-05-23 12:40 +0200
    Re: [RFC][PATCH 0/9] Make containers kernel objects Ian Kent <raven@themaw.net> - 2017-05-23 11:40 +0200
    Re: [RFC][PATCH 0/9] Make containers kernel objects David Howells <dhowells@redhat.com> - 2017-05-23 16:00 +0200
      Re: [RFC][PATCH 0/9] Make containers kernel objects James Bottomley <James.Bottomley@HansenPartnership.com> - 2017-05-23 17:10 +0200
      Re: [RFC][PATCH 0/9] Make containers kernel objects ebiederm@xmission.com (Eric W. Biederman) - 2017-05-23 17:40 +0200
  Re: [RFC][PATCH 0/9] Make containers kernel objects Jessica Frazelle <me@jessfraz.com> - 2017-05-22 19:20 +0200
    Re: [RFC][PATCH 0/9] Make containers kernel objects David Howells <dhowells@redhat.com> - 2017-05-23 17:20 +0200
  Re: [RFC][PATCH 0/9] Make containers kernel objects ebiederm@xmission.com (Eric W. Biederman) - 2017-05-22 21:20 +0200
    Re: [RFC][PATCH 0/9] Make containers kernel objects Jeff Layton <jlayton@redhat.com> - 2017-05-23 00:30 +0200
      Re: [RFC][PATCH 0/9] Make containers kernel objects ebiederm@xmission.com (Eric W. Biederman) - 2017-05-23 15:10 +0200
        Re: [RFC][PATCH 0/9] Make containers kernel objects Jeff Layton <jlayton@redhat.com> - 2017-05-23 16:30 +0200
        Re: [RFC][PATCH 0/9] Make containers kernel objects Djalal Harouni <tixxdz@gmail.com> - 2017-05-23 16:40 +0200
          Re: [RFC][PATCH 0/9] Make containers kernel objects Colin Walters <walters@verbum.org> - 2017-05-23 17:00 +0200
            Re: [RFC][PATCH 0/9] Make containers kernel objects Colin Walters <walters@verbum.org> - 2017-05-23 17:40 +0200
            Re: [RFC][PATCH 0/9] Make containers kernel objects David Howells <dhowells@redhat.com> - 2017-05-23 17:40 +0200
            Re: [RFC][PATCH 0/9] Make containers kernel objects Jeff Layton <jlayton@redhat.com> - 2017-05-23 17:40 +0200
      Re: [RFC][PATCH 0/9] Make containers kernel objects Djalal Harouni <tixxdz@gmail.com> - 2017-05-23 16:30 +0200
    Re: [RFC][PATCH 0/9] Make containers kernel objects David Howells <dhowells@redhat.com> - 2017-05-23 18:20 +0200
  Re: [RFC][PATCH 0/9] Make containers kernel objects Ian Kent <raven@themaw.net> - 2017-05-23 12:20 +0200
  Re: [RFC][PATCH 0/9] Make containers kernel objects ebiederm@xmission.com (Eric W. Biederman) - 2017-05-23 17:40 +0200

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