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Subject: Re: HAST + ZFS + NFS + CARP
From: Borja Marcos <borjam@sarenet.es>
In-Reply-To: <20160818132948.GB51561@neutralgood.org>
Date: Fri, 19 Aug 2016 09:56:19 +0200
Cc: krad <kraduk@gmail.com>, FreeBSD FS <freebsd-fs@freebsd.org>,
 InterNetX - Juergen Gotteswinter <juergen.gotteswinter@internetx.com>
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> On 18 Aug 2016, at 15:29, Kevin P. Neal <kpn@neutralgood.org> wrote:
>=20
> On Thu, Aug 18, 2016 at 08:36:24AM +0100, krad wrote:
>> I didnt think touch was atomic, mkdir is though
>=20
> The shell script snippit that was posted is not safe since there is =
time
> in between the touch and the check for the existance of the lock file.
>=20
> The better solution is to use FreeBSD's lockf command.

Unfortunately it=E2=80=99s not portable. Hence mkdir is the suggested =
way you will find on scripting
tutorials, especially the classic ones :)






Borja.