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Skip messages in dmesg using syslog-ng
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trumee
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Joined: 02 Mar 2003
Posts: 467
Location: London,UK

PostPosted: Sat Jun 07, 2014 12:14 am    Post subject: Skip messages in dmesg using syslog-ng Reply with quote

Hi,

I have couple of ivtv cards which tend to fill up my dmesg with lot of error messages. I have written rules in /etc/syslog-ng to capture these in /var/log/ivtv.log which works. However the messages still appear in dmesg.

Any idea why my syslog-ng doesnt skip messages in dmesg?

Code:

#cat /etc/syslog-ng.conf


@version: 3.4
# $Header: /var/cvsroot/gentoo-x86/app-admin/syslog-ng/files/3.4/syslog-ng.conf.gentoo,v 1.2 2013/06/02 01:18:35 mr_bones_ Exp $
#
# Syslog-ng default configuration file for Gentoo Linux

# https://bugs.gentoo.org/show_bug.cgi?id=426814
@include "scl.conf"

options {
    threaded(yes);
    chain_hostnames(no);

    stats_freq(43200);
    mark_freq(3600);
 
};


source src { system(); internal(); };

source syslog_udp {
        udp(port(514));
            };

destination messages { file("/var/log/messages"); };

destination df_wrt0 {
file("/var/log/router.log"
owner("xx") group("users"));
};


# By default messages are logged to tty12...
destination console_all { file("/dev/tty12"); };


log {
source(syslog_udp);
destination(df_wrt0);
};

destination mythbackend        { file("/var/log/mythtv/mythbackend.log"); };
destination mythfrontend       { file("/var/log/mythtv/mythfrontend.log"); };
destination mythfilldatabase   { file("/var/log/mythtv/mythfilldatabase.log"); };
destination mythcommflag       { file("/var/log/mythtv/mythcommflag.log"); };
destination mythpreviewgen     { file("/var/log/mythtv/mythpreviewgen.log"); };
destination mythmetadatalookup { file("/var/log/mythtv/mythmetadatalookup.log"); };
destination mythlogserver      { file("/var/log/mythtv/mythlogserver.log"); };

filter f_mythbackend        { facility("local7") and match("mythbackend" value("MESSAGE")); };
filter f_mythfrontend       { facility("local7") and match("mythfrontend" value("MESSAGE")); };
filter f_mythcommflag       { facility("local7") and match("mythcommflag" value("MESSAGE")); };
filter f_mythpreviewgen     { facility("local7") and match("mythpreviewgen" value("MESSAGE")); };
filter f_mythmetadatalookup { facility("local7") and match("mythmetadatalookup" value("MESSAGE")); };
filter f_mythfilldatabase   { facility("local7") and match("mythfilldatabase" value("MESSAGE")); };
filter f_mythlogserver      { facility("local7") and match("mythlogserver" value("MESSAGE")); };

log { source(src); filter(f_mythbackend);        destination(mythbackend); };
log { source(src); filter(f_mythfrontend);       destination(mythfrontend); };
log { source(src); filter(f_mythfilldatabase);   destination(mythfilldatabase); };
log { source(src); filter(f_mythcommflag);       destination(mythcommflag); };
log { source(src); filter(f_mythpreviewgen);     destination(mythpreviewgen); };
log { source(src); filter(f_mythmetadatalookup); destination(mythmetadatalookup); };
log { source(src); filter(f_mythlogserver);      destination(mythlogserver); };

destination df_ivtv {file("/var/log/ivtv.log"); };
filter f_ivtv {match("ivtv0" value("MESSAGE"));   };
log {
source(src);
filter(f_ivtv);
destination(df_ivtv);
};


destination df_null {file("/var/log/zm.log"); };
filter f_libjpeg {match("INF" value("MESSAGE"));   };
log {
source(src);
filter(f_libjpeg);
destination(df_null);
flags(final);
};

log { source(src); destination(messages); };
log { source(src); destination(console_all); };


Sample messages popping up in dmesg
Code:

dmesg |tail
[111742.858250] ivtv0: All encoder PCM stream buffers are full. Dropping data.
[111742.858253] ivtv0: Cause: the application is not reading fast enough.
[112375.528420] ivtv0: All encoder PCM stream buffers are full. Dropping data.
[112375.528423] ivtv0: Cause: the application is not reading fast enough.
[113332.199475] ivtv0: All encoder PCM stream buffers are full. Dropping data.
[113332.199478] ivtv0: Cause: the application is not reading fast enough.
[113568.698017] ivtv0: All encoder PCM stream buffers are full. Dropping data.
[113568.698026] ivtv0: Cause: the application is not reading fast enough.
[114308.856620] ivtv0: All encoder PCM stream buffers are full. Dropping data.
[114308.856627] ivtv0: Cause: the application is not reading fast enough.
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krinn
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Joined: 02 May 2003
Posts: 4433

PostPosted: Sat Jun 07, 2014 12:51 am    Post subject: Re: Skip messages in dmesg using syslog-ng Reply with quote

Code:

log {
source(src);
filter(f_ivtv);
destination(df_ivtv);
flags(final)
};

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khayyam
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Advocate


Joined: 07 Jun 2012
Posts: 2342

PostPosted: Sat Jun 07, 2014 1:23 am    Post subject: Re: Skip messages in dmesg using syslog-ng Reply with quote

trumee wrote:
I have couple of ivtv cards which tend to fill up my dmesg with lot of error messages. I have written rules in /etc/syslog-ng to capture these in /var/log/ivtv.log which works. However the messages still appear in dmesg.

trumee ... dmesg reads the kernel ring buffer, this is also what syslog-ng reads and filters. syslog-ng doesn't have any means of effecting what the kernel produces, only what gets logged and where.

You can effect the logging by 'not'ing the facility, eg:

Code:
filter f_messages { level(info..warn) and not facility(auth, authpriv, mail); };
log { source(src); filter(f_messages); destination(messages); };

... but I don't think this is what you're looking for, if its just a matter of filtering what dmesg returns you can provide a (comma seperated) list of facilities to list with '--facility='.

HTH & best ... khay
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