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

Zabrane Mickael <>
Fri Jan 6 21:35:03 CET 2012


Let me try all these hints on my release.
Thanks again Garrett !

Regards,
Zabrane

On Jan 6, 2012, at 9:35 PM, Dmitry Kolesnikov wrote:

> My issue pop up with R15B on EC2 small instance.
> On R14B04 it was working in similar manner like you shown.
> 
> - Dmitry
> 
> 
> On 6.1.2012, at 22.19, Garrett Smith <> wrote:
> 
>> On Fri, Jan 6, 2012 at 12:58 PM, dmitry kolesnikov
>> <> wrote:
>>> Hello,
>>> Recently I meet issue with run_erl and heart. Heart monitors only beam
>>> process, if run_erl dies then to_erl cannot access console. I am
>>> planning to rollback into remote shell approach.
>> 
>> This is not true. You may be seeing something environment specific or
>> have a configuration issue.
>> 
>> FWIW, I've used run_erl in a large variety of production settings and
>> would strongly recommend it.
>> 
>> Here's what I see on Linux R14B04:
>> 
>> $ mkdir /tmp/test
>> $ pgrep beam && pgrep run_erl # confirm no running Erlang procs
>> $ HEART_COMMAND="run_erl -daemon /tmp/test/ /tmp/test/ 'erl -heart'"
>> run_erl -daemon /tmp/test/ /tmp/test/ "erl -heart"
>> $ pgrep beam && pgrep run_erl
>> 8618
>> 8616
>> $ echo "1 + 1." | to_erl /tmp/test/
>> Attaching to /tmp/test/erlang.pipe.3 (^D to exit)
>> 
>> [EOF]
>> $ tail -n3 /tmp/test/erlang.log.1
>> 1> 1 + 1.
>> 2
>> $ pkill run_erl
>> $ pgrep beam && pgrep run_erl
>> 8703
>> 8701
>> $ echo "2 + 2." | to_erl /tmp/test/
>> Attaching to /tmp/test/erlang.pipe.4 (^D to exit)
>> 
>> [EOF]
>> $ tail -n3 /tmp/test/erlang.log.1
>> 1> 2 + 2.
>> 4
>> $ pkill beam
>> $ pgrep beam && pgrep run_erl
>> 8753
>> 8751
>> $ echo "4 + 4." | to_erl /tmp/test/
>> Attaching to /tmp/test/erlang.pipe.5 (^D to exit)
>> 
>> [EOF]
>> $ tail -n3 /tmp/test/erlang.log.1
>> 1> 4 + 4.
>> 8
>> $ pkill heart
>> $ pgrep beam && pgrep run_erl






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