From: Al Viro <viro@ZenIV.linux.org.uk>
To: Andy Lutomirski <luto@amacapital.net>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Linux FS Devel <linux-fsdevel@vger.kernel.org>
Subject: Re: How do I make a clean mount namespace?
Date: Thu, 24 Apr 2014 03:39:25 +0100 [thread overview]
Message-ID: <20140424023925.GW18016@ZenIV.linux.org.uk> (raw)
In-Reply-To: <CALCETrXE_T-3eKmVKZNkAfoyvC0CcUATDK7fGPvQrR9H=RHQag@mail.gmail.com>
On Tue, Apr 22, 2014 at 03:12:11PM -0700, Andy Lutomirski wrote:
> I want to set up a little container. So I unshare the mount namespace
> and mount something somewhere (say /mnt) that I want to be my new
> root. Now what?
>
> pivot_root("/mnt", "/mnt/garbage") seems to frequently return -EBUSY.
RTFM. Literally - man 2 pivot_root and look for the only place where
it mentions EBUSY.
If you get that error, check what you've got in /proc/mounts (in the
namespace your process is in, obviously) just before the syscall.
With these arguments you really want /mnt to be a mountpoint. If your
new root really lives on the same fs as the old one, just do
mount --bind /mnt /mnt before any other mounts.
next prev parent reply other threads:[~2014-04-24 2:39 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-22 22:12 How do I make a clean mount namespace? Andy Lutomirski
2014-04-23 20:01 ` Richard Weinberger
2014-04-24 0:54 ` Andy Lutomirski
2014-04-24 2:24 ` Al Viro
2014-04-24 2:39 ` Al Viro [this message]
2014-04-24 5:06 ` Andy Lutomirski
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