From: Colin Walters <walters@verbum.org>
To: Jeff Layton <jlayton@redhat.com>,
Djalal Harouni <tixxdz@gmail.com>,
"Eric W. Biederman" <ebiederm@xmission.com>
Cc: David Howells <dhowells@redhat.com>,
trondmy@primarydata.com, Miklos Szeredi <mszeredi@redhat.com>,
linux-nfs@vger.kernel.org,
"linux-kernel" <linux-kernel@vger.kernel.org>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Linux FS Devel <linux-fsdevel@vger.kernel.org>,
"open list:CONTROL GROUP (CGROUP)" <cgroups@vger.kernel.org>
Subject: Re: [RFC][PATCH 0/9] Make containers kernel objects
Date: Tue, 23 May 2017 11:35:52 -0400 [thread overview]
Message-ID: <1495553752.2751759.986007384.4E1A6A8B@webmail.messagingengine.com> (raw)
In-Reply-To: <1495553491.2946.16.camel@redhat.com>
On Tue, May 23, 2017, at 11:31 AM, Jeff Layton wrote:
>
> nfsdcltrack was originally nfsdcld, a long running daemon that used
> rpc_pipefs to talk to the kernel. That meant that you had to make sure
> it gets enabled by systemd (or sysvinit, etc). If it dies, then you also
> want to ensure that it gets restarted lest the kernel server hang,
> etc...
>
> It was pretty universally hated, as it was just one more daemon that you
> needed to run to work a proper nfs server. So, I was encouraged to
> switch it to a call_usermodehelper upcall and since then it has just
> worked, as long as the binary is installed.
Note that with the "read()/write() fd" model you don't need
a whole process just to do that...the functionality could be rolled into systemd
or equivalent easily enough.
> "You're doing it wrong. You just need to run all of these services as
> long-running daemons."
Also, I imagine we could figure out a clean model to do *activation*
from kernel -> userspace too. systemd's socket activation model
where pid 1 activates units on demand is quite nice and obviates
the need to configure things on in advance.
WARNING: multiple messages have this Message-ID (diff)
From: Colin Walters <walters-gPq2gbYjIk8dnm+yROfE0A@public.gmane.org>
To: Jeff Layton <jlayton-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Djalal Harouni <tixxdz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
"Eric W. Biederman"
<ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
Cc: David Howells <dhowells-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
trondmy-7I+n7zu2hftEKMMhf/gKZA@public.gmane.org,
Miklos Szeredi <mszeredi-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
linux-nfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Alexander Viro
<viro-RmSDqhL/yNMiFSDQTTA3OLVCufUGDwFn@public.gmane.org>,
Linux FS Devel
<linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"open list:CONTROL GROUP (CGROUP)"
<cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: [RFC][PATCH 0/9] Make containers kernel objects
Date: Tue, 23 May 2017 11:35:52 -0400 [thread overview]
Message-ID: <1495553752.2751759.986007384.4E1A6A8B@webmail.messagingengine.com> (raw)
In-Reply-To: <1495553491.2946.16.camel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
On Tue, May 23, 2017, at 11:31 AM, Jeff Layton wrote:
>
> nfsdcltrack was originally nfsdcld, a long running daemon that used
> rpc_pipefs to talk to the kernel. That meant that you had to make sure
> it gets enabled by systemd (or sysvinit, etc). If it dies, then you also
> want to ensure that it gets restarted lest the kernel server hang,
> etc...
>
> It was pretty universally hated, as it was just one more daemon that you
> needed to run to work a proper nfs server. So, I was encouraged to
> switch it to a call_usermodehelper upcall and since then it has just
> worked, as long as the binary is installed.
Note that with the "read()/write() fd" model you don't need
a whole process just to do that...the functionality could be rolled into systemd
or equivalent easily enough.
> "You're doing it wrong. You just need to run all of these services as
> long-running daemons."
Also, I imagine we could figure out a clean model to do *activation*
from kernel -> userspace too. systemd's socket activation model
where pid 1 activates units on demand is quite nice and obviates
the need to configure things on in advance.
next prev parent reply other threads:[~2017-05-23 15:35 UTC|newest]
Thread overview: 118+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-22 16:22 [RFC][PATCH 0/9] Make containers kernel objects David Howells
2017-05-22 16:22 ` David Howells
2017-05-22 16:22 ` [PATCH 1/9] containers: Rename linux/container.h to linux/container_dev.h David Howells
2017-05-22 16:22 ` [PATCH 2/9] Implement containers as kernel objects David Howells
2017-08-14 5:47 ` Richard Guy Briggs
2017-08-14 5:47 ` Richard Guy Briggs
[not found] ` <20170814054711.GB29957-bcJWsdo4jJjeVoXN4CMphl7TgLCtbB0G@public.gmane.org>
2017-08-16 22:21 ` Paul Moore
2017-08-16 22:21 ` Paul Moore
2017-08-16 22:21 ` Paul Moore
2017-08-16 22:21 ` Paul Moore
[not found] ` <CAHC9VhRgPRa7KeMt8G700aeFvqVYc0gMx__82K31TYY6oQQqTw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-08-18 8:03 ` Richard Guy Briggs
2017-08-18 8:03 ` Richard Guy Briggs
2017-08-18 8:03 ` Richard Guy Briggs
2017-09-06 14:03 ` Serge E. Hallyn
2017-09-06 14:03 ` Serge E. Hallyn
[not found] ` <20170906140341.GA8729-7LNsyQBKDXoIagZqoN9o3w@public.gmane.org>
2017-09-14 5:47 ` Richard Guy Briggs
2017-09-14 5:47 ` Richard Guy Briggs
2017-09-14 5:47 ` Richard Guy Briggs
[not found] ` <20170818080300.GQ7187-bcJWsdo4jJjeVoXN4CMphl7TgLCtbB0G@public.gmane.org>
2017-09-06 14:03 ` Serge E. Hallyn
2017-09-08 20:02 ` Paul Moore
2017-09-08 20:02 ` Paul Moore
[not found] ` <149547016213.10599.1969443294414531853.stgit-S6HVgzuS8uM4Awkfq6JHfwNdhmdF6hFW@public.gmane.org>
2017-08-14 5:47 ` Richard Guy Briggs
2017-05-22 16:22 ` [PATCH 3/9] Provide /proc/containers David Howells
2017-05-22 16:22 ` David Howells
2017-05-22 16:22 ` [PATCH 4/9] Allow processes to be forked and upcalled into a container David Howells
2017-05-22 16:22 ` David Howells
2017-05-22 16:23 ` [PATCH 5/9] Open a socket inside " David Howells
2017-05-22 16:23 ` [PATCH 6/9] Allow fs syscall dfd arguments to take a container fd David Howells
2017-05-22 16:23 ` [PATCH 7/9] Make fsopen() able to initiate mounting into a container David Howells
2017-05-22 16:23 ` [PATCH 8/9] Honour CONTAINER_NEW_EMPTY_FS_NS David Howells
2017-05-22 16:23 ` David Howells
2017-05-22 16:23 ` [PATCH 9/9] Sample program for driving container objects David Howells
[not found] ` <149547014649.10599.12025037906646164347.stgit-S6HVgzuS8uM4Awkfq6JHfwNdhmdF6hFW@public.gmane.org>
2017-05-22 16:53 ` [RFC][PATCH 0/9] Make containers kernel objects James Bottomley
2017-05-22 16:53 ` James Bottomley
2017-05-22 17:14 ` Aleksa Sarai
2017-05-22 17:14 ` Aleksa Sarai
2017-05-22 17:27 ` Jessica Frazelle
2017-05-22 17:27 ` Jessica Frazelle
2017-05-22 18:34 ` Jeff Layton
2017-05-22 18:34 ` Jeff Layton
[not found] ` <1495478092.2816.17.camel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2017-05-22 19:21 ` James Bottomley
2017-05-22 19:21 ` James Bottomley
2017-05-22 19:21 ` James Bottomley
2017-05-22 22:14 ` Jeff Layton
[not found] ` <1495480860.9050.18.camel-d9PhHud1JfjCXq6kfMZ53/egYHeGw8Jk@public.gmane.org>
2017-05-22 22:14 ` Jeff Layton
2017-05-23 10:35 ` Ian Kent
2017-05-23 10:35 ` Ian Kent
2017-05-23 10:35 ` Ian Kent
2017-05-23 9:38 ` Ian Kent
2017-05-23 9:38 ` Ian Kent
2017-05-23 9:38 ` Ian Kent
[not found] ` <1495472039.2757.19.camel-d9PhHud1JfjCXq6kfMZ53/egYHeGw8Jk@public.gmane.org>
2017-05-22 17:14 ` Aleksa Sarai
2017-05-22 17:27 ` Jessica Frazelle
2017-05-22 18:34 ` Jeff Layton
2017-05-23 9:38 ` Ian Kent
2017-05-23 13:52 ` David Howells
[not found] ` <f167feeb-e653-12e3-eec8-24162f7f7c07-l3A5Bk7waGM@public.gmane.org>
2017-05-23 14:53 ` David Howells
2017-05-23 14:53 ` David Howells
2017-05-23 14:56 ` Eric W. Biederman
2017-05-23 14:56 ` Eric W. Biederman
[not found] ` <2446.1495551216-S6HVgzuS8uM4Awkfq6JHfwNdhmdF6hFW@public.gmane.org>
2017-05-23 14:56 ` Eric W. Biederman
2017-05-23 15:14 ` David Howells
2017-05-23 15:14 ` David Howells
[not found] ` <2961.1495552481-S6HVgzuS8uM4Awkfq6JHfwNdhmdF6hFW@public.gmane.org>
2017-05-23 15:17 ` Eric W. Biederman
2017-05-23 15:17 ` Eric W. Biederman
[not found] ` <87bmqjmwl5.fsf-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2017-05-23 15:44 ` James Bottomley
2017-05-23 15:44 ` James Bottomley
2017-05-23 15:44 ` James Bottomley
[not found] ` <1495554267.27369.9.camel-d9PhHud1JfjCXq6kfMZ53/egYHeGw8Jk@public.gmane.org>
2017-05-23 16:36 ` David Howells
2017-05-23 16:36 ` David Howells
[not found] ` <3860.1495557363-S6HVgzuS8uM4Awkfq6JHfwNdhmdF6hFW@public.gmane.org>
2017-05-24 8:26 ` Eric W. Biederman
2017-05-24 8:26 ` Eric W. Biederman
2017-05-24 9:16 ` Ian Kent
2017-05-24 9:16 ` Ian Kent
[not found] ` <87k256ek3e.fsf-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2017-05-24 9:16 ` Ian Kent
[not found] ` <87zie3mxkc.fsf-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2017-05-23 15:14 ` David Howells
2017-05-22 17:11 ` Jessica Frazelle
2017-05-22 17:11 ` Jessica Frazelle
2017-05-22 19:04 ` Eric W. Biederman
2017-05-22 19:04 ` Eric W. Biederman
2017-05-22 22:22 ` Jeff Layton
2017-05-22 22:22 ` Jeff Layton
2017-05-23 12:54 ` Eric W. Biederman
2017-05-23 12:54 ` Eric W. Biederman
2017-05-23 14:27 ` Jeff Layton
2017-05-23 14:27 ` Jeff Layton
2017-05-23 14:30 ` Djalal Harouni
2017-05-23 14:30 ` Djalal Harouni
2017-05-23 14:54 ` Colin Walters
2017-05-23 14:54 ` Colin Walters
2017-05-23 15:31 ` Jeff Layton
2017-05-23 15:31 ` Jeff Layton
2017-05-23 15:35 ` Colin Walters [this message]
2017-05-23 15:35 ` Colin Walters
2017-05-23 15:30 ` David Howells
2017-05-23 14:23 ` Djalal Harouni
2017-05-23 14:23 ` Djalal Harouni
2017-05-27 17:45 ` Trond Myklebust
2017-05-27 17:45 ` Trond Myklebust
2017-05-27 19:10 ` James Bottomley
2017-05-27 19:10 ` James Bottomley
2017-05-30 1:03 ` Ian Kent
2017-05-30 1:03 ` Ian Kent
2017-05-23 10:09 ` Ian Kent
2017-05-23 10:09 ` Ian Kent
2017-05-23 13:52 ` David Howells
2017-05-23 13:52 ` David Howells
2017-05-23 15:02 ` James Bottomley
2017-05-23 15:02 ` James Bottomley
[not found] ` <32556.1495547529-S6HVgzuS8uM4Awkfq6JHfwNdhmdF6hFW@public.gmane.org>
2017-05-23 15:02 ` James Bottomley
2017-05-23 15:23 ` Eric W. Biederman
2017-05-23 15:23 ` Eric W. Biederman
2017-05-23 15:12 ` David Howells
2017-05-23 15:12 ` David Howells
2017-05-23 15:33 ` Eric W. Biederman
2017-05-23 15:33 ` Eric W. Biederman
2017-05-23 16:13 ` David Howells
2017-05-23 16:13 ` David Howells
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