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| Guest |
 Posted: Mon Aug 02, 2010 10:20 am |
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Guest
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Hello.
Description
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Every time I do "erl -sname foo" or just "epmd -daemon" I see this
message written to errors.log:
Aug 2 13:22:13 myhost epmd: epmd: epmd running - daemon = 1
Usually my errors.log is full of these messages, which aren't actually
errors. It looks like loglevel for these messages is wrong.
Why and where this happens
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Code we are interested in is in erts/epmd/src/epmd.c file
#1 First dbg_printf() is called with "epmd running - daemon = %d" format string
Source: http://github.com/erlang/otp/blob/dev/erts/epmd/src/epmd.c#L239
#2 Then dbg_printf() calls dbg_gen_printf()
Source: http://github.com/erlang/otp/blob/dev/erts/epmd/src/epmd.c#L494
#3 And here the message is actually sent to syslog.
Source: http://github.com/erlang/otp/blob/dev/erts/epmd/src/epmd.c#L449
The problem is that for the message LOG_ERR priority is used, which
seems to be wrong.
LOG_NOTICE, LOG_INFO or LOG_DEBUG seem more suitable here.
Environment
------------------
Related part of my /etc/syslog-ng.conf:
destination d_errors { file("/var/log/errors.log"); };
(...)
log { source(src); filter(f_err); destination(d_errors); };
There was similar letter some month ago:
http://www.erlang.org/cgi-bin/ezmlm-cgi?4:sss:50616:201004:gpmnkdkhkkmnlcghliek#b
Thanks.
--
Sergey Samokhin
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| Guest |
| Posted: Tue Aug 03, 2010 1:45 pm |
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Guest
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On Mon, Aug 02, 2010 at 02:19:02PM +0400, Sergey Samokhin wrote:
> Every time I do "erl -sname foo" or just "epmd -daemon" I see this
> message written to errors.log:
>
> Aug 2 13:22:13 myhost epmd: epmd: epmd running - daemon = 1
>
> Usually my errors.log is full of these messages, which aren't actually
> errors. It looks like loglevel for these messages is wrong.
> There was similar letter some month ago:
> http://www.erlang.org/cgi-bin/ezmlm-cgi?4:sss:50616:201004:gpmnkdkhkkmnlcghliek#b
Is the pid of the epmd process changing? Do you have more than one
epmd running? Check ps and netstat for port 4369.
For example, I can reproduce this behaviour by running "epmd" in one
shell and trying to start a second epmd in another shell.
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| Guest |
| Posted: Tue Aug 03, 2010 2:08 pm |
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Guest
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> Is the pid of the epmd process changing? Do you have more than one
> epmd running? Check ps and netstat for port 4369.
pid of epmd isn't changed and I have only one epmd running.
Every "erl -sname foo -run init stop" adds one "epmd running - daemon
= 1" to the errors.log
Steps to reproduce are quite easy (have just tested on clear virtual machine)
1. Install Erlang R13B04
2. Do "erl -sname foo -run init stop" N times
3. Take a look at "sudo cat /var/log/errors.log"; you will see N "epmd
running - daemon = 1" messages
--
Sergey Samokhin
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| Guest |
| Posted: Tue Aug 03, 2010 2:33 pm |
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Guest
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On Tue, Aug 03, 2010 at 06:05:41PM +0400, Sergey Samokhin wrote:
> > Is the pid of the epmd process changing? Do you have more than one
> > epmd running? Check ps and netstat for port 4369.
>
> pid of epmd isn't changed and I have only one epmd running.
>
> Every "erl -sname foo -run init stop" adds one "epmd running - daemon
> = 1" to the errors.log
>
> Steps to reproduce are quite easy (have just tested on clear virtual machine)
>
> 1. Install Erlang R13B04
> 2. Do "erl -sname foo -run init stop" N times
> 3. Take a look at "sudo cat /var/log/errors.log"; you will see N "epmd
> running - daemon = 1" messages
Thanks! I understand the issue now.
You suggested in your first email using LOG_INFO, but do you think this
patch would be sufficient? epmd will log (at LOG_ERR) only when one or
more "-d" flags are passed.
diff --git a/erts/epmd/src/epmd.c b/erts/epmd/src/epmd.c
index 6ddf30e..9c2ce06 100644
--- a/erts/epmd/src/epmd.c
+++ b/erts/epmd/src/epmd.c
@@ -237,5 +237,5 @@ int main(int argc, char** argv)
usage(g);
}
- dbg_printf(g,0,"epmd running - daemon = %d",g->is_daemon);
+ dbg_printf(g,1,"epmd running - daemon = %d",g->is_daemon);
#ifndef NO_SYSCONF
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| Guest |
| Posted: Tue Aug 03, 2010 3:52 pm |
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Guest
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Hello, Michael!
> You suggested in your first email using LOG_INFO, but do you think this
> patch would be sufficient? epmd will log (at LOG_ERR) only when one or
> more "-d" flags are passed.
I have just tested your patch in VirtualBox, it is completely
sufficient! No more annoying messages in errors.log (untill -d is
specified, as you said)!
Big thanks! I would be very happy to see this patch in the next Erlang release!
--
Sergey Samokhin
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| Guest |
| Posted: Tue Aug 03, 2010 4:44 pm |
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Guest
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On Tue, Aug 03, 2010 at 07:51:22PM +0400, Sergey Samokhin wrote:
> Hello, Michael!
>
> > You suggested in your first email using LOG_INFO, but do you think this
> > patch would be sufficient? epmd will log (at LOG_ERR) only when one or
> > more "-d" flags are passed.
>
> I have just tested your patch in VirtualBox, it is completely
> sufficient! No more annoying messages in errors.log (untill -d is
> specified, as you said)!
>
> Big thanks! I would be very happy to see this patch in the next Erlang release!
Awesome! I will submit the patch to erlang-patches later today.
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| wuji |
| Posted: Fri Aug 24, 2012 7:10 am |
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User
Joined: 10 Aug 2012
Posts: 654
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