Re: [syslog-ng] How to log messages generated by C program and log file rotation

6 Aug 2014

      Hi,

You seem to have defined the source as a named pipe whereas the libc
usually uses a UNIX domain socket to send messages.

Why don't you simply use the system() source? Or at least define use
unix-dgram("/dev/log")
 On Aug 6, 2014 11:11 AM, "Jean Faye" <ismael.faye@yahoo.fr> wrote:
...
Hi all,
I want to use syslog-ng to log the messages generated by my application
implemented in C language. I added this in the code:
char    *log="rtcd";
    printf("[%s] RTC adjustement\n",__func__);
    openlog(log, LOG_PID, LOG_LOCAL0);
    syslog(LOG_DEBUG, "[FIJ] RTC adjustement");
    closelog();
For me, according to the syslog-ng file, the files
/var/log/ldb/GENTrace.log, /var/log/ldb/SUTrace.log,
/var/log/ldb/WANTrace.log and /var/log/ldb/CPLTrace.log must be created and
must contain the syslog message.
But I got no messages in my destination files. You can see the content of
my syslog-ng.conf file bellow.
Is it the right way to log the messages sent by C program? What can
explain that I got no messages in the destinations files?
I am using syslog-ng 3.5.4.1 provided by yocto. And in the script which
run the binary (initscript file) I remove the line below:
. /etc/init.d/functions
Why are you using the line? Is it necessary to use it?
Concerning log file rotation, How can we manage it using syslog-ng? For
example I want to have a destination file with a size maximum = 2Mo and if
the size is greater than the max size, I have to save the current one and
create a new one. On my system I can have max 4 files (4 x 2Mo). How can I
manage this kind of rotation?
Thanks in advance.
Best regards,
Ismael Jean FAYE
@version: 3.5
#
# Syslog-ng configuration file, compatible with default Debian syslogd
# installation. Originally written by anonymous (I can't find his name)
# Revised, and rewrited by me (SZALAY Attila <sasa@debian.org>)
# First, set some global options.
options { chain_hostnames(off); flush_lines(0); use_dns(no); use_fqdn(no);
      owner("root"); group("adm"); perm(0640); stats_freq(0);
      bad_hostname("^gconfd$");create_dirs(yes);
};
########################
# Sources
########################
source s_mysource {
    pipe("/tmp/pipe" pad_size(2048));
};
########################
# Destinations
########################
destination d_GEN {
                file("/var/log/ldb/GENTrace.log");
};
destination d_SU {
                file("/var/log/ldb/SUTrace.log");
};
destination d_WAN {
                file("/var/log/ldb/WANTrace.log");
};
destination d_CPL {
                file("/var/log/ldb/CPLTrace.log");
};
########################
# Filters
########################
filter f_GEN {
                #facility(local0) and filter(nom_du_composant_applicatif);
                #facility(local0) and filter(f_debug);
                facility(local0);
};
filter f_SU {
                #facility(local0) and filter(nom_du_composant_applicatif);
                #facility(local0) and filter(f_debug);
                facility(local0);
};
filter f_WAN {
                #facility(local0) and filter(nom_du_composant_applicatif);
                #facility(local0) and filter(f_debug);
                facility(local0);
};
filter f_CPL {
                #facility(local0) and filter(nom_du_composant_applicatif);
                #facility(local0) and filter(f_debug);
                facility(local0);
};
########################
# Log paths
########################
log { source(s_mysource); filter(f_GEN); destination(d_GEN); };
log { source(s_mysource); filter(f_SU); destination(d_SU); };
log { source(s_mysource); filter(f_WAN); destination(d_WAN); };
log { source(s_mysource); filter(f_CPL); destination(d_CPL); };
Le Mardi 5 août 2014 16h05, Jean Faye <ismael.faye@yahoo.fr> a écrit :
confirm a6d843f7ad7d1dbf1fefb6f12432e54941a680a9
Hi all,
I want to use syslog-ng to log the messages generated by my application
implemented in C language. I added this in the code:
char    *log="rtcd";
    printf("[%s] RTC adjustement\n",__func__);
    openlog(log, LOG_PID, LOG_LOCAL0);
    syslog(LOG_DEBUG, "[FIJ] RTC adjustement");
    closelog();
For me, according to the syslog-ng file, the files
/var/log/ldb/GENTrace.log, /var/log/ldb/SUTrace.log,
/var/log/ldb/WANTrace.log and /var/log/ldb/CPLTrace.log must be created and
must contain the syslog message.
But I got no messages in my destination files. You can see the content of
my syslog-ng.conf file bellow.
Is it the right way to log the messages sent by C program? What can
explain that I got no messages in the destinations files?
Concerning log file rotation, How can we manage it using syslog-ng? For
example I want to have a destination file with a size maximum = 2Mo and if
the size is greater than the max size, I have to save the current one and
create a new one. On my system I can have max 4 files (4 x 2Mo). How can I
manage this kind of rotation?
Thanks in advance.
Best regards,
Ismael Jean FAYE
@version: 3.5
#
# Syslog-ng configuration file, compatible with default Debian syslogd
# installation. Originally written by anonymous (I can't find his name)
# Revised, and rewrited by me (SZALAY Attila <sasa@debian.org>)
# First, set some global options.
options { chain_hostnames(off); flush_lines(0); use_dns(no); use_fqdn(no);
      owner("root"); group("adm"); perm(0640); stats_freq(0);
      bad_hostname("^gconfd$");create_dirs(yes);
};
########################
# Sources
########################
source s_mysource {
    pipe("/tmp/pipe" pad_size(2048));
};
########################
# Destinations
########################
destination d_GEN {
                file("/var/log/ldb/GENTrace.log");
};
destination d_SU {
                file("/var/log/ldb/SUTrace.log");
};
destination d_WAN {
                file("/var/log/ldb/WANTrace.log");
};
destination d_CPL {
                file("/var/log/ldb/CPLTrace.log");
};
########################
# Filters
########################
#filter f_GEN {
                #facility(local0) and filter(nom_du_composant_applicatif);
                #facility(local0) and filter(f_debug);
                #facility(local0);
#};
filter f_SU {
                #facility(local0) and filter(nom_du_composant_applicatif);
                #facility(local0) and filter(f_debug);
                facility(local0);
};
filter f_WAN {
                #facility(local0) and filter(nom_du_composant_applicatif);
                #facility(local0) and filter(f_debug);
                facility(local0);
};
filter f_CPL {
                #facility(local0) and filter(nom_du_composant_applicatif);
                #facility(local0) and filter(f_debug);
                facility(local0);
};
########################
# Log paths
########################
#log { source(s_mysource); filter(f_GEN); destination(d_GEN); };
log { source(s_mysource); filter(f_SU); destination(d_SU); };
log { source(s_mysource); filter(f_WAN); destination(d_WAN); };
log { source(s_mysource); filter(f_CPL); destination(d_CPL); };
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Re: [syslog-ng] How to log messages generated by C program and log file rotation

Balazs Scheidler