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ElpersonPL avatar Server

syslog-ng duplicate log message

pk flag
ElpersonPL

Not duplicate of this question because that one uses rsyslog on client whereas I use syslog-ng on both sides.

I have a syslog-ng instance on both the client and the server and for whatever reason the there are repeated log lines in the server log. The logs are sent into the mail facility.

2021-12-18T21:01:44+01:00 192.168.1.11 [warning] Warning: this is a test
2021-12-18T21:01:44+01:00 192.168.1.11 [err] TEST ERROR
2021-12-18T21:01:44+01:00 192.168.1.11 [crit] not a crit cond actually
2021-12-18T21:01:44+01:00 192.168.1.11 [alert] wee woo wee woo
(duplicated lines start here)
2021-12-18T21:01:44+01:00 192.168.1.11 [warning] Warning: this is a test
2021-12-18T21:01:44+01:00 192.168.1.11 [err] TEST ERROR
2021-12-18T21:01:44+01:00 192.168.1.11 [crit] not a crit cond actually
2021-12-18T21:01:44+01:00 192.168.1.11 [alert] wee woo wee woo

My syslog-ng client config

@version: 3.33
@include "scl.conf"
#
# /etc/syslog-ng/syslog-ng.conf
#

options {
  stats_freq (0);
  flush_lines (0);
  time_reopen (10);
  log_fifo_size (10000);
  chain_hostnames (off);
  dns_cache (no);
  use_dns (no);
  use_fqdn (no);
  create_dirs (no);
  keep_hostname (yes);
  perm(0640);
  group("log");
};

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

destination d_authlog { file("/var/log/auth.log"); };
destination d_syslog { file("/var/log/syslog.log"); };
destination d_cron { file("/var/log/crond.log"); };
destination d_daemon { file("/var/log/daemon.log"); };
destination d_kernel { file("/var/log/kernel.log"); };
destination d_lpr { file("/var/log/lpr.log"); };
destination d_user { file("/var/log/user.log"); };
destination d_uucp { file("/var/log/uucp.log"); };
destination d_mail {
  syslog("raspi" port(8000) transport("tcp"));
  #file("/var/log/mail.log");
};
destination d_news { file("/var/log/news.log"); };
destination d_ppp { file("/var/log/ppp.log"); };
destination d_debug { file("/var/log/debug.log"); };
destination d_messages { file("/var/log/messages.log"); };
destination d_errors { file("/var/log/errors.log"); };
destination d_everything { file("/var/log/everything.log"); };
destination d_iptables { file("/var/log/iptables.log"); };
destination d_acpid { file("/var/log/acpid.log"); };
destination d_console { usertty("root"); };

# Log everything to tty12
destination console_all { file("/dev/tty12"); };

filter f_auth { facility(auth); };
filter f_authpriv { facility(auth, authpriv); };
filter f_syslog { program(syslog-ng); };
filter f_cron { facility(cron); };
filter f_daemon { facility(daemon); };
filter f_kernel { facility(kern) and not filter(f_iptables); };
filter f_lpr { facility(lpr); };
filter f_mail { facility(mail); };
filter f_news { facility(news); };
filter f_user { facility(user); };
filter f_uucp { facility(uucp); };
filter f_ppp { facility(local2); };
filter f_debug { not facility(auth, authpriv, news, mail); };
filter f_messages { level(info..warn) and not facility(auth, authpriv, mail, news, cron) and not program(syslog-ng) and not filter(f_iptables); };
filter f_everything { level(debug..emerg) and not facility(auth, authpriv); };
filter f_emergency { level(emerg); };
filter f_info { level(info); };
filter f_notice { level(notice); };
filter f_warn { level(warn); };
filter f_crit { level(crit); };
filter f_err { level(err); };
filter f_iptables { match("IN=" value("MESSAGE")) and match("OUT=" value("MESSAGE")); };
filter f_acpid { program("acpid"); };

log { source(src); filter(f_acpid); destination(d_acpid); };
log { source(src); filter(f_authpriv); destination(d_authlog); };
log { source(src); filter(f_syslog); destination(d_syslog); };
log { source(src); filter(f_cron); destination(d_cron); };
log { source(src); filter(f_daemon); destination(d_daemon); };
log { source(src); filter(f_kernel); destination(d_kernel); };
log { source(src); filter(f_lpr); destination(d_lpr); };
log { source(src); filter(f_mail); destination(d_mail); };
log { source(src); filter(f_news); destination(d_news); };
log { source(src); filter(f_ppp); destination(d_ppp); };
log { source(src); filter(f_user); destination(d_user); };
log { source(src); filter(f_uucp); destination(d_uucp); };
#log { source(src); filter(f_debug); destination(d_debug); };
log { source(src); filter(f_messages); destination(d_messages); };
log { source(src); filter(f_err); destination(d_errors); };
log { source(src); filter(f_emergency); destination(d_console); };
log { source(src); filter(f_everything); destination(d_everything); };
log { source(src); filter(f_iptables); destination(d_iptables); };

# Log everything to tty12
#log { source(src); destination(console_all); };

The server config

@version: 3.27
@include "scl.conf"

# Syslog-ng configuration file, compatible with default Debian syslogd
# installation.

# First, set some global options.
options { chain_hostnames(off); flush_lines(0); use_dns(no); use_fqdn(no);
      dns_cache(no); owner("root"); group("adm"); perm(0640);
      stats_freq(0); bad_hostname("^gconfd$");
};

########################
# Sources
########################
# This is the default behavior of sysklogd package
# Logs may come from unix stream, but not from another machine.
#
source s_src {
       syslog(ip("0.0.0.0") port(8000) transport("tcp"));
};

# If you wish to get logs from remote machine you should uncomment
# this and comment the above source line.
#
#source s_net { tcp(ip(127.0.0.1) port(1000)); };

########################
# Destinations
########################
# First some standard logfile
#
template recv {
    template("${ISODATE} ${HOST} [${LEVEL}] ${MESSAGE}\n");
};
destination d_auth { file("/var/log/auth.log"); };
destination d_cron { file("/var/log/cron.log"); };
destination d_daemon { file("/var/log/daemon.log"); };
destination d_kern { file("/var/log/kern.log"); };
destination d_lpr { file("/var/log/lpr.log"); };
destination d_mail { file("/var/log/${YEAR}-${MONTH}.log" template(recv)); };
destination d_syslog { file("/var/log/syslog"); };
destination d_user { file("/var/log/user.log"); };
destination d_uucp { file("/var/log/uucp.log"); };

# This files are the log come from the mail subsystem.
#
#destination d_mailinfo { file("/var/log/mail.info"); };
#destination d_mailwarn { file("/var/log/mail.warn"); };
#destination d_mailerr { file("/var/log/mail.err"); };

# Logging for INN news system
#
destination d_newscrit { file("/var/log/news/news.crit"); };
destination d_newserr { file("/var/log/news/news.err"); };
destination d_newsnotice { file("/var/log/news/news.notice"); };

# Some 'catch-all' logfiles.
#
destination d_debug { file("/var/log/debug"); };
destination d_error { file("/var/log/error"); };
destination d_messages { file("/var/log/messages"); };

# The root's console.
#
destination d_console { usertty("root"); };

# Virtual console.
#
destination d_console_all { file(`tty10`); };

# The named pipe /dev/xconsole is for the nsole' utility.  To use it,
# you must invoke nsole' with the -file' option:
#
#    $ xconsole -file /dev/xconsole [...]
#
destination d_xconsole { pipe("/dev/xconsole"); };

# Send the messages to an other host
#
#destination d_net { tcp("127.0.0.1" port(1000) log_fifo_size(1000)); };

# Debian only
destination d_ppp { file("/var/log/ppp.log"); };

########################
# Filters
########################
# Here's come the filter options. With this rules, we can set which 
# message go where.

filter f_dbg { level(debug); };
filter f_info { level(info); };
filter f_notice { level(notice); };
filter f_warn { level(warn); };
filter f_err { level(err); };
filter f_crit { level(crit .. emerg); };

filter f_debug { level(debug) and not facility(auth, authpriv, news, mail); };
filter f_error { level(err .. emerg) ; };
filter f_messages { level(info,notice,warn) and 
                    not facility(auth,authpriv,cron,daemon,mail,news); };

filter f_auth { facility(auth, authpriv) and not filter(f_debug); };
filter f_cron { facility(cron) and not filter(f_debug); };
filter f_daemon { facility(daemon) and not filter(f_debug); };
filter f_kern { facility(kern) and not filter(f_debug); };
filter f_lpr { facility(lpr) and not filter(f_debug); };
filter f_local { facility(local0, local1, local3, local4, local5,
                        local6, local7) and not filter(f_debug); };
filter f_mail { facility(mail) and not filter(f_debug) and not host("localhost"); };
filter f_news { facility(news) and not filter(f_debug); };
filter f_syslog3 { not facility(auth, authpriv, mail) and not filter(f_debug); };
filter f_user { facility(user) and not filter(f_debug); };
filter f_uucp { facility(uucp) and not filter(f_debug); };

filter f_cnews { level(notice, err, crit) and facility(news); };
filter f_cother { level(debug, info, notice, warn) or facility(daemon, mail); };

filter f_ppp { facility(local2) and not filter(f_debug); };
filter f_console { level(warn .. emerg); };

########################
# Log paths
########################
log { source(s_src); filter(f_auth); destination(d_auth); };
log { source(s_src); filter(f_cron); destination(d_cron); };
log { source(s_src); filter(f_daemon); destination(d_daemon); };
log { source(s_src); filter(f_kern); destination(d_kern); };
log { source(s_src); filter(f_lpr); destination(d_lpr); };
log { source(s_src); filter(f_syslog3); destination(d_syslog); };
log { source(s_src); filter(f_user); destination(d_user); };
log { source(s_src); filter(f_uucp); destination(d_uucp); };

log { source(s_src); filter(f_mail); destination(d_mail); };
#log { source(s_src); filter(f_mail); filter(f_info); destination(d_mailinfo); };
#log { source(s_src); filter(f_mail); filter(f_warn); destination(d_mailwarn); };
#log { source(s_src); filter(f_mail); filter(f_err); destination(d_mailerr); };

log { source(s_src); filter(f_news); filter(f_crit); destination(d_newscrit); };
log { source(s_src); filter(f_news); filter(f_err); destination(d_newserr); };
log { source(s_src); filter(f_news); filter(f_notice); destination(d_newsnotice); };
#log { source(s_src); filter(f_cnews); destination(d_console_all); };
#log { source(s_src); filter(f_cother); destination(d_console_all); };

#log { source(s_src); filter(f_ppp); destination(d_ppp); };

log { source(s_src); filter(f_debug); destination(d_debug); };
log { source(s_src); filter(f_error); destination(d_error); };
log { source(s_src); filter(f_messages); destination(d_messages); };

log { source(s_src); filter(f_console); destination(d_console_all);
                    destination(d_xconsole); };
log { source(s_src); filter(f_crit); destination(d_console); };

# All messages send to a remote site
#
#log { source(s_src); destination(d_net); };

###
# Include all config files in /etc/syslog-ng/conf.d/
###
@include "/etc/syslog-ng/conf.d/*.conf"
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in flag
Robert Fekete
Hi, it's not clear where do the duplicate messages appear: is it in the d_mail destination files on your server? If yes, then are they also duplicated on the client side (when you enable the commented file destination in the client's d_mail)?
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ElpersonPL avatar
pk flag
ElpersonPL
@RobertFekete The issue seems to happen only on the server. The client logs fine.
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in flag
Robert Fekete
Weird. Is there anything in your /etc/syslog-ng/conf.d/ directory that could add another source or log statement?
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