[ale] ssh question [solved]

[Richard Bronosky]

Does this mean that another solution could have been this?
ssh hostname "etc/init.d/service restart; echo;"

Good to know. I didn't know of that behavior.

On Thu, May 10, 2012 at 9:40 AM, Michael H. Warfield <mhw at wittsend.com> wrote:
> On Thu, 2012-05-10 at 08:27 -0400, Edward Holcroft wrote:
>> This is what worked:
>
>> $ sshpass -p '1qazxsw2' ssh -o StrictHostKeyChecking=no -t
>> root at 192.168.50.87 "/etc/init.d/asterisk restart; sleep 5; exit"
>
> The problem you've run into is an old one that been known and discussed
> for a long time.  What happens is that sshd will not exit until all the
> fds are closed, not just that the child has exited.  This is intended to
> insure that any buffered IO has been passed back to the client before
> terminating the server end.  What has happened is that your "asterisk
> restart" process has forked off a daemon (asterisk service) that has not
> closed stdout and stderr so sshd hangs around even though the script is
> done.  By running the commands the way you did in your "solution", you
> run an extra shell to handle the chain of commands with an explicit
> exit.  There are several different ways of handling it, all with their
> pluses and minuses.
>
> The behavior was discussed over on the OpenSSH forums quite some time
> ago and debate invariable boils down to the conclusion - "works by
> design - not a bug - will not fix".  They blame it on the daemon
> processes which did not close out their stdout and stderr fds when they
> forked off the daemon process.
>
> Regards,
> Mike
>
>> On Thu, May 10, 2012 at 7:59 AM, Edward Holcroft <eholcroft at mkainc.com>wrote:
>>
>> > Morning all
>> >
>> > I need to run a command on an internal server that will restart a given
>> > service, in this case asterisk, without user intervention. I using this:
>> >
>> > sshpass -p '1qazxsw2' ssh -o StrictHostKeyChecking=no root at 192.168.50.87/etc/init.d/asterisk restart
>> >
>> > The problem is this command never logs out:
>> >
>> > Stopping safe_asterisk: [  OK  ]
>> > Shutting down asterisk: [  OK  ]
>> > Starting asterisk: [  OK  ]
>> >
>> > .... and there it sits, until I manually close it
>> >
>> > I also tried using -t with the ssh command, which closes the session, but
>> > without restarting the service, even though it says it did:
>> >
>> > $ sshpass -p '1qazxsw2' ssh -o StrictHostKeyChecking=no -t
>> > root at 192.168.50.87 "/etc/init.d/asterisk restart"
>> > Stopping safe_asterisk:                                    [FAILED]
>> > Shutting down asterisk:                                    [FAILED]
>> > Starting asterisk:                                         [  OK  ]
>> > Connection to 192.168.50.87 closed.
>> >
>> > I found this article:
>> >
>> > http://www.snailbook.com/faq/background-jobs.auto.html
>> >
>> > And tried:
>> >
>> > $ sshpass -p '1qazxsw2' ssh -o StrictHostKeyChecking=no root at 192.168.50.87/etc/init.d/asterisk restart < /dev/null
>> >
>> > which also does not close.
>> >
>> > Any ideas on how I can get this to run the way I want it to?
>> >
>> > ed
>> > --
>> > Edward Holcroft
>> > Madsen Kneppers & Associates Inc.
>> > 3020 Holcomb Bridge Rd. NW
>> > Norcross, GA
>> > 30071
>> > Tel (770) 446-9606
>> > GoogleVoice (678) 587-8649
>> >
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>> >
>>
>>
>>
>> --
>> Edward Holcroft
>> Madsen Kneppers & Associates Inc.
>> 3020 Holcomb Bridge Rd. NW
>> Norcross, GA
>> 30071
>> Tel (770) 446-9606
>> GoogleVoice (678) 587-8649
>>
>> WARNING/CONFIDENTIALITY NOTICE:This message may be confidential and/or
>> privileged. If you are not the intended recipient, please notify the sender
>> immediately then delete it - you should not copy or use it for any purpose
>> or disclose its content to any other person. Internet communications are
>> not secure. You should scan this message and any attachments for viruses.
>> Any unauthorized use or interception of this e-mail is illegal.
>>
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> --
> Michael H. Warfield (AI4NB) | (770) 985-6132 |  mhw at WittsEnd.com
>   /\/\|=mhw=|\/\/          | (678) 463-0932 |  http://www.wittsend.com/mhw/
>   NIC whois: MHW9          | An optimist believes we live in the best of all
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