[erlang-questions] run_erl logfiles and cron

Jay Doane <>
Fri Nov 29 07:23:12 CET 2013


I'm using cron because I didn't want to write an init script for my
project, but I'm certainly open to a better solution.

Please feel free to enlighten me.

Thanks,
Jay


On Wed, Nov 27, 2013 at 10:52 PM, Dmitry Kolesnikov
<>wrote:

> Just curious, why are you using cron to start application after reboot?
> There is a nice service utility that is capable to restart all background
> applications.
>
> Best Regards,
> Dmitry >-|-|-*>
>
>
> On 28.11.2013, at 5.35, Jay Doane <> wrote:
>
> Daniel,
>
> Great clue!  A search for "pseudo tty cron" led me to this link:
> https://www.linuxquestions.org/questions/linux-server-73/running-process-from-cron-with-ptty-588635/,
> and an eventual solution like this:
>
> @reboot screen -d -m ~/my_proj/rel/my_proj/bin/my_proj start
>
> Thanks,
> Jay
>
>
> On Wed, Nov 27, 2013 at 4:29 PM, Szoboszlay Dániel <>wrote:
>
>>  Hi,
>>
>> That's because cron doesn't allocate a pseudo tty for your program, so
>> your node starts up with the old shell. (Hopefully some Linux guru will
>> know how to fix it, but I have no idea.)
>>
>> BR,
>> Daniel
>>
>> On Wed, 27 Nov 2013 23:23:07 -0000, Jay Doane <>
>> wrote:
>>
>> Hi,
>>
>> As an expedient, when the host is booted, I'm starting an erlang project
>> with cron using something similar to the following in a crontab:
>>
>> @reboot ~/my_proj/rel/my_proj/bin/my_proj start
>>
>> where my_proj is built using "rebar compile generate".
>>
>> While this *does* actually start the erlang project, the "run_erl"
>> logfiles it generates differ from those that are generated when the project
>> is started from the command line using the same command; *each log entry
>> is suffixed with a ()1> prompt.*
>>
>> For example, here's a snippet of log started via cron (weird suffixes
>> highlighted in red)
>>
>> Eshell V5.9.2  (abort with ^G)
>> ()1>
>> =INFO REPORT==== 27-Nov-2013::19:41:54 ===
>> Registering 0 remote connections on node '
>> '(
>> )1>
>> =INFO REPORT==== 27-Nov-2013::19:41:54 ===
>> Node '' connected with 0
>> users()1>
>>
>> And the same snippet later when started from bash:
>>
>> Eshell V5.9.2  (abort with ^G)
>> ()1>
>> =INFO REPORT==== 27-Nov-2013::19:56:42 ===
>> Registering 0 remote connections on node '
>> '
>> =INFO REPORT==== 27-Nov-2013::19:56:42 ===
>> Node '' connected with 0
>> users
>>
>> Can anyone give me any clues as to why this might be happening, and
>> especially suggestions on how to stop it?
>>
>> Thanks,
>> Jay
>>
>>
>>
>>
>>
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>> 
>> http://erlang.org/mailman/listinfo/erlang-questions
>>
>>
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