Date: Mon, 3 Nov 2014 21:13:34 -0800 From: Kevin Oberman <rkoberman@gmail.com> To: Denny Lin <dennylin93@hs.ntnu.edu.tw> Cc: FreeBSD Ports ML <freebsd-ports@freebsd.org> Subject: Re: SSH hangs while restarting services Message-ID: <CAN6yY1tuewKkL-%2BAVAgmX-b3Lo7edR6wFxOO3zyeH4S6BjjqzA@mail.gmail.com> In-Reply-To: <20141104004803.GE3153@mail.hs.ntnu.edu.tw> References: <20141104004803.GE3153@mail.hs.ntnu.edu.tw>
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On Mon, Nov 3, 2014 at 4:48 PM, Denny Lin <dennylin93@hs.ntnu.edu.tw> wrote=
:
> Hi,
>
> Recently I've been trying to restart services remotely using SSH using a
> command instead of entering the shell:
> ssh host "sudo service postgresql restart"
>
> PostgreSQL is able to restart successfully, but SSH just hangs there
> instead of exiting. I've noticed that this seems to affect any command
> which spawns a child process which doesn't exit.
>
> Is there any way to get SSH terminate? Thanks.
>
> --
> Denny Lin
>
Try "ssh -f host "sudo service postgresql restart". If a socket is open,
ssh will not exist and something in the startup is leaving something link
STDOUT open. Use of '-f'' should work around this issue. From ssh(1):
-f Requests ssh to go to background just before command execution=
.
This is useful if ssh is going to ask for passwords or
passphrases, but the user wants it in the background. This
implies -n. The recommended way to start X11 programs at a
remote site is with something like ssh -f host xterm.
If the ExitOnForwardFailure configuration option is set to
=E2=80=9Cyes=E2=80=9D,
then a client started with -f will wait for all remote port
for=E2=80=90
wards to be successfully established before placing itself in
the
background.
--
R. Kevin Oberman, Network Engineer, Retired
E-mail: rkoberman@gmail.com
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