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From Robert Newson <rnew...@apache.org>
Subject Re: Running couchdb remotely (from an interactive shell)
Date Wed, 12 Dec 2012 17:58:42 GMT
Hi Nestor,

The ssh command you showed should create a couchdb process completely
daemonized and immune to the exit of your shell, can you file a ticket
at https://issues.apache.org/jira/browse/CouchDB please?

B.

On 12 December 2012 17:30, Nestor Urquiza <nestor.urquiza@gmail.com> wrote:
> Hi Shane,
>
> CFEngine is doing the magic behind scenes. Try it please with:
> $ ssh -t remoteserver sudo /etc/init.d/couchdb restart
>
> Once the ssh command finishes couchdb dies.
>
> I am starting couchdb just with the command above. It works from
> command line when I am logged in the server but it fails when the
> command is sent over ssh as with the command above.
>
> Those options you refer to are interesting and might be a thing to
> look at, I will try them and see how it goes. And yet I will need to
> put them inside the current script or build a wrapper so the original
> question will still remain: If it makes sense to modify the restart
> script so it works from a remote execution via an interactive shell
> command.
>
> BTW I need to use option -t as I need to interact with the remote box.
> We do not want to send command by command but rather execute recipes
> remotely from pure bash scripts.
>
> Thanks,
> - Nestor
>
> On Wed, Dec 12, 2012 at 10:15 AM, Shane McEwan
> <shane@actual-experience.com> wrote:
>> I've restarted CouchDB using the supplied init.d script via ssh and also
>> automatically with CFEngine many, many times and I've never had a problem
>> with it killing the couchdb process when I logout.
>>
>> The nohup command disconnects a process from the terminal's stardard input,
>> error and output file descriptors. I haven't had to use nohup since back
>> when I used have a dial-up modem directly attached to a serial port on my
>> servers.
>>
>> Are you starting couchdb with the '-o' and '-e' options? Maybe couchdb will
>> disconnect STDOUT and STDERR for you and, thus, shouldn't need nohup.
>>
>>
>> On 12/12/12 14:51, Nestor Urquiza wrote:
>>>
>>> Hi Robert,
>>>
>>> For maintenance purposes you might want to remotely restart couchdb.
>>> For example you remotely install couchdb and after that you remotely
>>> harden it (changing configuration files) which demands a restart.
>>>
>>> We prefer to maintain the servers remotely rather than login into them
>>> and manually execute commands. We script the commands for absolutely
>>> everything, from building the whole server to patching it to changing
>>> configuration etc.
>>>
>>> With the same recipe we guarantee not relying on memory or going
>>> manually through steps. The steps are in scripts.
>>>
>>> BTW we use Plain Old Bash (POB) recipes with the help of Remoto-IT, a
>>> simple and open source script based on expect and to remotely run
>>> scripts in a server.
>>>
>>> The init.d script as I said will die as it is attached to the console
>>> session if you are running it from ssh. The nohup command can be used
>>> like screen can be used as well (like mentioned in this thread).
>>>
>>> I believe in these days where automation is key, couchdb should
>>> support be run from a remote ssh interactive session. That is what my
>>> change (using nohup) allows. I am wondering if it makes sense to
>>> include the change even if it demands a configure or *.ini option.
>>>
>>> Right now we are just storing the modified script on svn and patching
>>> the original from POB recipes, it works but I just want to make sure
>>> this is not such a need that makes it reasonable to have it as a
>>> feature request for future releases of couchdb.
>>>
>>> Thanks!
>>> - Nestor
>>>
>>> On Wed, Dec 12, 2012 at 8:59 AM, Robert Newson <rnewson@apache.org> wrote:
>>>>
>>>> CouchDB includes a script to launch it as a daemon, a standard init.d
>>>> script. I'm confused why you'd ssh to a machine, run couchdb in the
>>>> foreground, and log off.
>>>>
>>>>
>>>> On 12 December 2012 13:34, Wayne Conrad <wconrad@yagni.com> wrote:
>>>>>
>>>>> On 12/11/2012 11:53 AM, Nestor Urquiza wrote:
>>>>>>
>>>>>> As other users have asked in the past to this list couchdb will not
>>>>>> run from a remote interactive shell but rather it will be killed
when
>>>>>> the ssh session terminates. The command nohup can help with that.
Here
>>>>>> is what I did (which works OK):
>>>>>
>>>>>
>>>>> Terminal multiplexors like screen and tmux are very good for "I want
to
>>>>> start a non-daemon, disconnect, and come back later to see what
>>>>> happened."
>>>>>
>>>>> Here's how it works with screen:
>>>>>
>>>>> log on
>>>>> $ screen
>>>>> $ (enter log running command)
>>>>> type control-a d to detach the screen session
>>>>> log off
>>>>>
>>>>> later...
>>>>>
>>>>> log into the remote system
>>>>> $ screen -r
>>>>>
>>>>> and you'll be back in your long running program's term, including any
>>>>> output
>>>>> the program printed while you were gone.
>>>>>
>>>>> Best Regards,
>>>>> Wayne Conrad

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