Suppress Kernel messages with syslog-ng

[Tomte]

Hello,

 

I receive regular kernel messages in kern.log and messages I would like to get rid of. They are growing the log files and preventing the HDDs from standby.

one of this message is:

 

2025-01-03T15:07:35+01:00 Syno-S720 kernel: [ 2054.515999] synobios get empty ttyS current
2025-01-03T15:08:34+01:00 Syno-S720 kernel: [ 2113.656214] synobios get empty ttyS current
2025-01-03T15:09:35+01:00 Syno-S720 kernel: [ 2174.803813] synobios get empty ttyS current
2025-01-03T15:10:37+01:00 Syno-S720 kernel: [ 2235.968474] synobios get empty ttyS current
2025-01-03T15:11:38+01:00 Syno-S720 kernel: [ 2297.126995] synobios get empty ttyS current

I already disabled all the serial ports in the BIOS, but the message keeps coming.

 

I generated a file in

:/usr/local/etc/syslog-ng/patterndb.d/Kernel.conf

with the following contents:

# filter Kernel Nachrichten

source s_kernel {
    file("/proc/kmsg");
};


filter f_ignore_synobios { not match("synobios get empty ttyS current"); };

log {
    source(s_kernel);
    filter(f_ignore_synobios);
    destination(d_null);  # Nachrichten an null senden
};

However, it does not work.

 

Does anyone have an idea, what I am missing?

 

Regards, Tomte

 

[Tomte]

I added to

/usr/local/etc/syslog-ng/patterndb.d/include/not2kern

a file called Kernel with

and not filter(f_ignore_synobios)

and changed /usr/local/etc/syslog-ng/patterndb.d/Kernel.conf to

# filter Kernel Nachrichten


filter f_ignore_synobios { match("synobios get empty ttyS current" value("MESSAGE")); };

log {
    source(src);
    filter(f_ignore_synobios);
#    destination(d_null);  # Nachrichten an null senden
};

Restarted syslog-ng, but still no success?!?

Edited January 3 by Tomte
code update

[Tomte]

Ok, I made it work.

I changed the filter to

filter f_ttyS { match("empty ttyS" value("MESSAGE")); };

and the name of the filter accordingy at all other occurances.

Furthermore, probably the key to success, I changed the access rights to

-rw-r--r-- 1 root root  136 Jan 10 22:43 Kernel.conf

with chmod 644 ...

same for the files in not2kern and not2msg