[erlang-questions] "detached VM" vs "VM under screen"

Gianfranco Alongi <>
Fri Jan 6 12:19:18 CET 2012


I had concerns that keeping it in screen would use more memory if the
node started spewing messages?

Am I right?

On Fri, Jan 6, 2012 at 4:22 AM, Fred Hebert <> wrote:
> The tab support has been added to R15, if I recall.
>
> We run erl in -noshell mode, but always distributed. If the need
> arises, I use a remote shell (still started from the same node) to do
> my diagnostics/debugging, just connecting as a hidden node and
> starting a remote job with ^G. I find it nicer than using screen,
> especially since software like screen or tmux have sometimes frozen on
> me. In these cases, I think it's simpler to just start a new remote
> shell from a new connection and leave the application undisturbed.
>
> You just have to be careful not to type 'q()', 'halt()' or
> 'init:stop()' in the job running on the production node ;)
>
> I generally think it's nicer to do it that way than in a screen
> session -- that way you can daemonize your Erlang processes, and
> integrate them better in their environment.
>
> On Thu, Jan 5, 2012 at 12:19 PM, James Aimonetti <> wrote:
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>> We run everything in detached mode, and use a bash script to connect to
>> the VM when we need access to it directly.
>>
>> Our bash script boils down to:
>>
>> exec erl $ERL_COOKIE -name ${SHELL_NAME} -remsh ${REMOTE_SHELL}
>>
>> with SHELL_NAME usually generated by SHELL_NAME = "con_$(date
>> +%s)@`hostname`".
>>
>> You won't get tab-complete on your modules/functions (I think the
>> standard erlang modules work though), but it works well enough for our
>> purposes.
>>
>> On 01/05/2012 05:45 AM, Max Bourinov wrote:
>>> We also run everything under screen. And it is nice to have shell = access
>>> to all things in the running system, but you must know what you do in there
>>> :-)
>>>
>>> Sent from my iPhone
>>>
>>> On 05.01.2012, at 17:26, Jesse Gumm <> wrote:
>>>
>>> I run under screen, since I run screen for everything already, it's nice to
>>> always have the erlang shell up and ready if I need it.
>>>
>>> -Jesse
>>>
>>> --
>>> Jesse Gumm
>>> Owner, Sigma Star Systems
>>> 414.940.4866
>>> www.sigma-star.com
>>> @jessegumm
>>> On Jan 5, 2012 7:03 AM, "CGS" <> wrote:
>>>
>>>> Hi,
>>>>
>>>> One major preference to use -detached (implies -noinput which implies
>>>> further -noshell) option is when you want to create a persistent
>>>> application which doesn't depend on your connection with the machine where
>>>> you run the application. It is similar with "nohup" command under Linux. It
>>>> also implies the use of less resources than "screen", but with no
>>>> capability to interact directly with it.
>>>>
>>>> CGS
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> On 01/05/2012 12:27 PM, Zabrane Mickael wrote:
>>>>
>>>>> Hi guys,
>>>>>
>>>>> Is there any preference between running a VM in a "detached mode"  (i.e
>>>>> erl -detached ...)
>>>>> or simply running it inside "screen" for example witout detaching from it
>>>>> (i.e erl ...) ?
>>>>>
>>>>> What are the pros/cons?
>>>>> Best practices?
>>>>>
>>>>> Regards,
>>>>> Zabrane
>>>>>
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>>
>> - --
>> James Aimonetti
>> Distributed Systems Engineer / DJ MC_
>>
>> 2600hz | http://2600hz.com
>> sip:
>> tel: 415.886.7905
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