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Syslog-ng.conf Examples

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Options Configuring syslog-ng to send logs Filters Configuration Examples Tips History Humor

Introduction

A key aspect of management of network servers and devices is regular review of log messages. Log messages can also be used forensically to troubleshoot network problems. On many types of systems including Linux and UNIX servers and various other networking devices like switches and routers, system message logging follows a standardized format known as syslog messages. One way to improve IT management and administration is to centralize syslog messages from all the diverse devices on a corporate network onto a single syslog server or loghost. Centralization allows the use of automated log analysis tools to alert and search for specific message types, improving the tools available to system administrators to manage networks.

Syslog-NG has sophisticated filtering mechanisms which allow different system messages for a given host to be routed to different files or logging mechanisms depending on type or severity. For example, messages with a low severity could be logged to file, while messages with higher severity could be logged to file and emailed to the sysadmin's mobile phone for immediate action. On SLED 10, Syslog-NG is the default system logger.

Configuring Loghost to Receive Log Messages

By default Syslog-NG is configured only to log messages from the host it is running on. If you want a centralized loghost, you must enable Syslog-NG to receive log messages from over the network.   See

You have to edit /etc/syslog-ng/syslog-ng.in and add some settings. The file is divided into sections called source, destination, filter and log.

Structure of syslog-ng configuration file

Syslog-ng configuration file is based on idea of separation of "filters" used to select messages from the messages stream and targets.

  1. Filters are defines with filter statements, in which you define label and content of partifcular filte. After that the filter can be referenced by ifs label, For example let's define label  f_cron to be filter that select cron messages:
    filter f_cron { facility(cron); };
  2. Targers are defined with destination statement. For example:
    destination cron { file("/var/log/cron.log"); };
After that you can match filter and target to create log statement which corresponds to the rule of classic syslog, with the difference that you operate using labels not actually definitions:
log { source(src); filter(f_authpriv); destination(authlog); };
One additional feature that you also define source of log messages in the log statement. But for most such statement the source is syslog stream:
source src { unix-stream("/dev/log"); internal(); };

Examples

syslog-ng examples

Options and source
options { long_hostnames(off); sync(0); };

source src { unix-stream("/dev/log"); internal(); };
source kernsrc { file("/proc/kmsg"); };
2. Destination
destination authlog { file("/var/log/auth.log"); };
destination syslog { file("/var/log/syslog"); };
destination cron { file("/var/log/cron.log"); };
destination daemon { file("/var/log/daemon.log"); };
destination kern { file("/var/log/kern.log"); };
destination lpr { file("/var/log/lpr.log"); };
destination user { file("/var/log/user.log"); };
destination uucp { file("/var/log/uucp.log"); };
destination ppp { file("/var/log/ppp.log"); };
destination mail { file("/var/log/mail.log"); };

destination mailinfo { file("/var/log/mail.info"); };
destination mailwarn { file("/var/log/mail.warn"); };
destination mailerr { file("/var/log/mail.err"); };
destination local0 { file("/var/log/local0.log"); };
destination local1 { file("/var/log/local1.log"); };
destination all { file("/var/log/all.log"); };

destination newscrit { file("/var/log/news/news.crit"); };
destination newserr { file("/var/log/news/news.err"); };
destination newsnotice { file("/var/log/news/news.notice"); };

destination debug { file("/var/log/debug"); };
destination messages { file("/var/log/messages"); };
destination console { usertty("root"); };
destination console_all { file("/dev/tty12"); };
3.Filters
filter f_auth { facility(auth); };
filter f_authpriv { facility(auth, authpriv); };
filter f_syslog { not facility(authpriv, mail) and not match(ppp.*LCP); };
filter f_cron { facility(cron); };
filter f_daemon { facility(daemon); };
filter f_kern { facility(kern); };
filter f_lpr { facility(lpr); };
filter f_mail { facility(mail) and not match (imapd); };
filter f_user { facility(user); };
filter f_uucp { facility(cron); };
filter f_ppp { program(ppp); };
filter f_news { facility(news); };
filter f_debug { not facility(auth, authpriv, news, mail) and not match(ppp.*LCP); };
filter f_messages { level(info..warn) 
	and not facility(auth, authpriv, mail, news); };
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); };
4. Output
log { source(src); filter(f_authpriv); destination(authlog); };
log { source(src); filter(f_syslog); destination(syslog); };
log { source(src); filter(f_cron); destination(cron); };
log { source(src); filter(f_daemon); destination(daemon); };
log { source(kernsrc); filter(f_kern); destination(kern); };
log { source(src); filter(f_lpr); destination(lpr); };
log { source(src); filter(f_mail); destination(mail); };
log { source(src); filter(f_user); destination(user); };
log { source(src); filter(f_uucp); destination(uucp); };
log { source(src); filter(f_mail); filter(f_info); destination(mailinfo); };
log { source(src); filter(f_mail); filter(f_warn); destination(mailwarn); };
log { source(src); filter(f_mail); filter(f_err); destination(mailerr); };
log { source(src); filter(f_news); filter(f_crit); destination(newscrit); };
log { source(src); filter(f_news); filter(f_err); destination(newserr); };
log { source(src); filter(f_news); filter(f_notice); destination(newsnotice); };
log { source(src); filter(f_debug); destination(debug); };
log { source(src); filter(f_messages); destination(messages); };
log { source(src); filter(f_emergency); destination(console); };
log { source(src); filter(f_ppp); destination(ppp); };
log { source(src); destination(console_all); };
log { source(src); destination(all); };

I've setup syslog-ng to archive logs to host-specific directories in /var/log/HOSTS on my central loghost. This way standard UNIX tools like find and grep can be used for log parsing and do it either by time or by host. To grep against the log files for all hosts on November 8th, 2001 I can do this:

 $  grep hacker /var/log/HOSTS/*/2001/11/08/*

...and I can just traverse all logs for a host using find or 'grep -r' since all logs for one host are in a single directory structure.

Here's the syslog-ng.conf directives to archive the way I've done it:

  destination hosts { 
   file("/var/log/HOSTS/$HOST/$YEAR/$MONTH/$DAY/$FACILITY$YEAR$MONTH$DAY"
   owner(root) group(root) perm(0600) dir_perm(0700) create_dirs(yes)); 
  };
  
  log {
	source(src);
	destination(hosts);
  };
 

With this you can match message content (in this case the string "attackalert") and mail them. In syslog-ng.conf:

  destination mail-alert-perl { program("/usr/local/bin/syslog-mail-perl"); };
  
  filter f_attack_alert {
		match("attackalert"); 
  };
  
  # find messages with "attackalert" in them, and send to the mail-alert script
  log {
	source(src);
	filter(f_attack_alert);
	destination(mail-alert-perl);
   };

Use this perl script to strip off the message priority (which I've found to be useless and just clutters up the message) and mail it:

Check out a sample syslog-ng.conf file Warning:

Before you put in place automatic email alerts - ask yourself if it's possible to generate hundreds or even thousands of those log messages. What would happen to your mail server? Would you even see any other alerts if you're deleting hundreds or thousands of one message?

Put in place some throtting before you setup auto-emailing (you can use the "bash-mail-alert" script from the swatch section). This is a great area for DoS, so watch yourself.

configure syslog-ng

options { long_hostnames (off);
          sync (0);
          log_fifo_size(10);
          owner(root);
          group(sys);
          perm(0644);
        };

source local { sun-streams("/dev/log" door("/etc/.syslog_door"));
               internal(); 
             };

destination d_cons { file("/dev/console"); };
destination d_mesg { file("/var/adm/messages" perm(0600)); };
destination d_auth { file("/var/log/authlog"); };
destination d_mail { file("/var/log/maillog"); };
destination d_news { file("/var/log/newslog"); };
destination d_daem { file("/var/log/daemonlog"); };
destination d_ipf  { file("/var/log/ipf.log"); };
destination d_mlop { usertty("operator"); };
destination d_mlrt { usertty("root"); };
destination d_mlal { usertty("*"); };

filter f_filter1   { level(err) or
                     (level(notice) and facility (auth, kern)); };
filter f_filter2   { level(err) or
                     (facility(kern) and level(notice)) or
                     (facility(daemon) and level(notice)) or
                     (facility(mail) and level(crit)); };
filter f_filter3   { level(alert) or
                     (facility(kern) and level(err)) or
                     (facility(daemon) and level(err)); };
filter f_filter4   { level(alert); };
filter f_filter5   { level(emerg); };
filter f_filter6   { facility(user) and level(err); };
filter f_filter7   { facility(user) and level(alert); };
filter f_filter8   { facility(kern) and level(notice); };

filter f_mail { facility(mail); };
filter f_news { facility(news); };
filter f_auth { facility(auth); };
filter f_daem { facility(daemon) and 
level(info,warn,notice,err,crit,alert,emerg); };
filter f_ipf  { facility(local0); };

filter f_debug     { not facility(auth, news, mail, local0); };
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); };

log { source(local); filter(f_filter1); destination(d_cons); };
log { source(local); filter(f_filter2); destination(d_mesg); };
log { source(local); filter(f_filter3); destination(d_mlop); };
log { source(local); filter(f_filter4); destination(d_mlrt); };
log { source(local); filter(f_filter5); destination(d_mlal); };
log { source(local); filter(f_filter6); destination(d_cons);
                                        destination(d_mesg); };
log { source(local); filter(f_filter7); destination(d_mlop);
                                        destination(d_mlrt); };
log { source(local); filter(f_filter8); destination(d_auth); };

log { source(local); filter(f_auth); destination(d_auth); };
log { source(local); filter(f_daem); destination(d_daem); };
log { source(local); filter(f_mail); destination(d_mail); };
log { source(local); filter(f_news); destination(d_news); };
log { source(local); filter(f_ipf); destination(d_ipf); };

BigAdmin Feature Article Creating a Centralized Secure Log Server with syslog-ng and Stunnel

# Options
options {
          use_fqdn(yes);
          sync(0);
          keep_hostname(yes);
          chain_hostnames(no);
	  create_dirs(yes);
        };

# Sources of syslog messages (both local and remote messages on the server)
source s_local   { 
                   sun-streams("/dev/log" door("/etc/.syslog_door")); 
                   internal();
                 };
source s_stunnel { 
                   tcp(ip("127.0.0.1")
                   port(514)
                   max-connections(1));
                 };

source s_udp     { udp(); };

# Level Filters
filter f_emerg   { level (emerg);            };
filter f_alert   { level (alert .. emerg);   };
filter f_crit    { level (crit .. emerg);    };
filter f_err     { level (err .. emerg);     };
filter f_warning { level (warning .. emerg); };
filter f_notice  { level (notice .. emerg);  };
filter f_info    { level (info .. emerg);    };
filter f_debug   { level (debug .. emerg);   };

# Facility Filters
filter f_kern   { facility (kern);   };
filter f_user   { facility (user);   };
filter f_mail   { facility (mail);   };
filter f_daemon { facility (daemon); };
filter f_auth   { facility (auth);   };
filter f_syslog { facility (syslog); };
filter f_lpr    { facility (lpr);    };
filter f_news   { facility (news);   };
filter f_uucp   { facility (uucp);   };
filter f_cron   { facility (cron);   };
filter f_local0 { facility (local0); };
filter f_local1 { facility (local1); };
filter f_local2 { facility (local2); };
filter f_local3 { facility (local3); };
filter f_local4 { facility (local4); };
filter f_local5 { facility (local5); };
filter f_local6 { facility (local6); };
filter f_local7 { facility (local7); };

# Custom Filters
filter f_user_none     { not facility (user);                     };
filter f_kern_debug    { filter (f_kern) and filter (f_debug);    };
filter f_daemon_notice { filter (f_daemon) and filter (f_notice); };
filter f_mail_crit     { filter (f_mail) and filter (f_crit);     };
filter f_mesg          { filter (f_kern_debug) or 
                         filter (f_daemon_notice) or 
                         filter (f_mail_crit);                    };
filter f_authinfo      { filter (f_auth) or program (sudo);       };

# Destinations: local files, the console, and the client files
destination l_authlog  { file ("/var/log/authlog");   };
destination l_messages { file ("/var/log/messages");  };
destination l_maillog  { file ("/var/log/maillog");   };
destination l_ipflog   { file ("/var/log/ipflog");    };
destination l_imaplog  { file ("/var/log/imaplog");   };
destination l_syslog   { file ("/var/log/syslog");    };

destination l_console  { file ("/dev/console");       };

destination r_authlog  { file
  ("/var/log/clients/$YEAR/$MONTH/$HOST/authlog");    }; 
destination r_messages { file 
  ("/var/log/clients/$YEAR/$MONTH/$HOST/messages");   }; 
destination r_maillog  { file 
  ("/var/log/clients/$YEAR/$MONTH/$HOST/maillog");    }; 
destination r_ipflog   { file 
  ("/var/log/clients/$YEAR/$MONTH/$HOST/ipflog");     }; 
destination r_imaplog  { file 
  ("/var/log/clients/$YEAR/$MONTH/$HOST/imaplog");    }; 
destination r_console  { file 
  ("/var/log/clients/$YEAR/$MONTH/$HOST/consolelog"); }; 
destination r_syslog   { file
  ("/var/log/clients/$YEAR/$MONTH/$HOST/syslog");     };
destination r_fallback { file
  ("/var/log/clients/$YEAR/$MONTH/$HOST/$FACILITY-$LEVEL"); };

# Log statements
# Local sources
log { source (s_local); filter (f_authinfo)  destination (l_authlog);  };
log { source (s_local); filter (f_mail);     destination (l_maillog);  };
log { source (s_local); filter (f_local0);   destination (l_ipflog);   };
log { source (s_local); filter (f_local1);   destination (l_imaplog);  };
log { source (s_local); filter (f_syslog);   destination (l_syslog);   };
log { source (s_local); filter (f_emerg); filter (f_user_none); 
                                             destination (l_console);  };
log { source (s_local); filter (f_mesg);  filter (f_user_none);
                                             destination (l_messages); }; 

# All sources, since we want to archive local and remote logs
log { source (s_local); source (s_stunnel); filter (f_authinfo);
     destination (r_authlog);   };
log { source (s_local); source (s_stunnel); filter (f_mail);
     destination (r_maillog);   };
log { source (s_local); source (s_stunnel); filter (f_local0);
   destination (r_ipflog);      };
log { source (s_local); source (s_stunnel); filter (f_local1);
   destination (r_imaplog);     };
log { source (s_local); source (s_stunnel); filter (f_syslog);
   destination (r_syslog);      };
log { source (s_local); source (s_stunnel); filter (f_emerg); 
      filter (f_user_none);
      destination (l_console);  };
log { source (s_local); source (s_stunnel); filter (f_mesg);
   filter (f_user_none);
      destination (l_messages); };

In this example client syslog-ng.conf, the filters remain the same, but most other parts of the configuration either change to reflect the client status or are removed:

# Options
options { 
          sync(0);
          use_fqdn(yes);
        };

# Sources of syslog messages (only local on clients)
source s_local { 
                 sun-streams("/dev/log" door("/etc/.syslog_door")); 
                 internal();
               };

# Destinations: local files, the console, and the remote syslog server
destination l_authlog  { file ("/var/log/authlog");   };
destination l_messages { file ("/var/log/messages");  };
destination l_maillog  { file ("/var/log/maillog");   };
destination l_ipflog   { file ("/var/log/ipflog");    };
destination l_imaplog  { file ("/var/log/imaplog");   };
destination l_console  { file ("/dev/console");       };
destination l_syslog   { file ("/var/log/syslog");    };
destination stunnel    { tcp ("127.0.0.1", port(514)); };

# Level Filters
filter f_emerg   { level (emerg);            };
filter f_alert   { level (alert .. emerg);   };
filter f_crit    { level (crit .. emerg);    };
filter f_err     { level (err .. emerg);     };
filter f_warning { level (warning .. emerg); };
filter f_notice  { level (notice .. emerg);  };
filter f_info    { level (info .. emerg);    };
filter f_debug   { level (debug .. emerg);   };

# Facility Filters
filter f_kern   { facility (kern);   };
filter f_user   { facility (user);   };
filter f_mail   { facility (mail);   };
filter f_daemon { facility (daemon); };
filter f_auth   { facility (auth);   };
filter f_syslog { facility (syslog); };
filter f_lpr    { facility (lpr);    };
filter f_news   { facility (news);   };
filter f_uucp   { facility (uucp);   };
filter f_cron   { facility (cron);   };
filter f_local0 { facility (local0); };
filter f_local1 { facility (local1); };
filter f_local2 { facility (local2); };
filter f_local3 { facility (local3); };
filter f_local4 { facility (local4); };
filter f_local5 { facility (local5); };
filter f_local6 { facility (local6); };
filter f_local7 { facility (local7); }; 

# Custom Filters
filter f_user_none     { not facility (user);                     };
filter f_kern_debug    { filter (f_kern) and filter (f_debug);    };
filter f_daemon_notice { filter (f_daemon) and filter (f_notice); };
filter f_mail_crit     { filter (f_mail) and filter (f_crit);     };
filter f_mesg          { filter (f_kern_debug) or 
                         filter (f_daemon_notice) or 
                         filter (f_mail_crit);                    };
filter f_authinfo      { filter (f_auth) or program (sudo);       };

# Log statements
# Log things locally
log { source (s_local); filter (f_authinfo); destination (l_authlog);  };
log { source (s_local); filter (f_mail);     destination (l_maillog);  };
log { source (s_local); filter (f_local0);   destination (l_ipflog);   };
log { source (s_local); filter (f_local1);   destination (l_imaplog);  };
log { source (s_local); filter (f_syslog);   destination (l_syslog);   };
log { source (s_local); filter (f_emerg); filter (f_user_none); 
                                             destination (l_console);  };
log { source (s_local); filter (f_mesg); filter (f_user_none);
                                             destination (l_messages); }; 

# Log everything remotely via stunnel
log { source (s_local);                      destination (stunnel);    };

 


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Old News ;-)

syslog-ng examples

Options and source
options { long_hostnames(off); sync(0); };

source src { unix-stream("/dev/log"); internal(); };
source kernsrc { file("/proc/kmsg"); };
2. Destination
destination authlog { file("/var/log/auth.log"); };
destination syslog { file("/var/log/syslog"); };
destination cron { file("/var/log/cron.log"); };
destination daemon { file("/var/log/daemon.log"); };
destination kern { file("/var/log/kern.log"); };
destination lpr { file("/var/log/lpr.log"); };
destination user { file("/var/log/user.log"); };
destination uucp { file("/var/log/uucp.log"); };
destination ppp { file("/var/log/ppp.log"); };
destination mail { file("/var/log/mail.log"); };

destination mailinfo { file("/var/log/mail.info"); };
destination mailwarn { file("/var/log/mail.warn"); };
destination mailerr { file("/var/log/mail.err"); };
destination local0 { file("/var/log/local0.log"); };
destination local1 { file("/var/log/local1.log"); };
destination all { file("/var/log/all.log"); };

destination newscrit { file("/var/log/news/news.crit"); };
destination newserr { file("/var/log/news/news.err"); };
destination newsnotice { file("/var/log/news/news.notice"); };

destination debug { file("/var/log/debug"); };
destination messages { file("/var/log/messages"); };
destination console { usertty("root"); };
destination console_all { file("/dev/tty12"); };
3.Filters
filter f_auth { facility(auth); };
filter f_authpriv { facility(auth, authpriv); };
filter f_syslog { not facility(authpriv, mail) and not match(ppp.*LCP); };
filter f_cron { facility(cron); };
filter f_daemon { facility(daemon); };
filter f_kern { facility(kern); };
filter f_lpr { facility(lpr); };
filter f_mail { facility(mail) and not match (imapd); };
filter f_user { facility(user); };
filter f_uucp { facility(cron); };
filter f_ppp { program(ppp); };
filter f_news { facility(news); };
filter f_debug { not facility(auth, authpriv, news, mail) and not match(ppp.*LCP); };
filter f_messages { level(info..warn) 
	and not facility(auth, authpriv, mail, news); };
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); };
4. Output
log { source(src); filter(f_authpriv); destination(authlog); };
log { source(src); filter(f_syslog); destination(syslog); };
log { source(src); filter(f_cron); destination(cron); };
log { source(src); filter(f_daemon); destination(daemon); };
log { source(kernsrc); filter(f_kern); destination(kern); };
log { source(src); filter(f_lpr); destination(lpr); };
log { source(src); filter(f_mail); destination(mail); };
log { source(src); filter(f_user); destination(user); };
log { source(src); filter(f_uucp); destination(uucp); };
log { source(src); filter(f_mail); filter(f_info); destination(mailinfo); };
log { source(src); filter(f_mail); filter(f_warn); destination(mailwarn); };
log { source(src); filter(f_mail); filter(f_err); destination(mailerr); };
log { source(src); filter(f_news); filter(f_crit); destination(newscrit); };
log { source(src); filter(f_news); filter(f_err); destination(newserr); };
log { source(src); filter(f_news); filter(f_notice); destination(newsnotice); };
log { source(src); filter(f_debug); destination(debug); };
log { source(src); filter(f_messages); destination(messages); };
log { source(src); filter(f_emergency); destination(console); };
log { source(src); filter(f_ppp); destination(ppp); };
log { source(src); destination(console_all); };
log { source(src); destination(all); };

I've setup syslog-ng to archive logs to host-specific directories in /var/log/HOSTS on my central loghost. This way standard UNIX tools like find and grep can be used for log parsing and do it either by time or by host. To grep against the log files for all hosts on November 8th, 2001 I can do this:

 $  grep hacker /var/log/HOSTS/*/2001/11/08/*

...and I can just traverse all logs for a host using find or 'grep -r' since all logs for one host are in a single directory structure.

Here's the syslog-ng.conf directives to archive the way I've done it:

  destination hosts { 
   file("/var/log/HOSTS/$HOST/$YEAR/$MONTH/$DAY/$FACILITY$YEAR$MONTH$DAY"
   owner(root) group(root) perm(0600) dir_perm(0700) create_dirs(yes)); 
  };
  
  log {
	source(src);
	destination(hosts);
  };
 

With this you can match message content (in this case the string "attackalert") and mail them. In syslog-ng.conf:

  destination mail-alert-perl { program("/usr/local/bin/syslog-mail-perl"); };
  
  filter f_attack_alert {
		match("attackalert"); 
  };
  
  # find messages with "attackalert" in them, and send to the mail-alert script
  log {
	source(src);
	filter(f_attack_alert);
	destination(mail-alert-perl);
   };

Use this perl script to strip off the message priority (which I've found to be useless and just clutters up the message) and mail it:

Check out a sample syslog-ng.conf file Warning:

Before you put in place automatic email alerts - ask yourself if it's possible to generate hundreds or even thousands of those log messages. What would happen to your mail server? Would you even see any other alerts if you're deleting hundreds or thousands of one message?

Put in place some throtting before you setup auto-emailing (you can use the "bash-mail-alert" script from the swatch section). This is a great area for DoS, so watch yourself.

configure syslog-ng

options { long_hostnames (off);
          sync (0);
          log_fifo_size(10);
          owner(root);
          group(sys);
          perm(0644);
        };

source local { sun-streams("/dev/log" door("/etc/.syslog_door"));
               internal(); 
             };

destination d_cons { file("/dev/console"); };
destination d_mesg { file("/var/adm/messages" perm(0600)); };
destination d_auth { file("/var/log/authlog"); };
destination d_mail { file("/var/log/maillog"); };
destination d_news { file("/var/log/newslog"); };
destination d_daem { file("/var/log/daemonlog"); };
destination d_ipf  { file("/var/log/ipf.log"); };
destination d_mlop { usertty("operator"); };
destination d_mlrt { usertty("root"); };
destination d_mlal { usertty("*"); };

filter f_filter1   { level(err) or
                     (level(notice) and facility (auth, kern)); };
filter f_filter2   { level(err) or
                     (facility(kern) and level(notice)) or
                     (facility(daemon) and level(notice)) or
                     (facility(mail) and level(crit)); };
filter f_filter3   { level(alert) or
                     (facility(kern) and level(err)) or
                     (facility(daemon) and level(err)); };
filter f_filter4   { level(alert); };
filter f_filter5   { level(emerg); };
filter f_filter6   { facility(user) and level(err); };
filter f_filter7   { facility(user) and level(alert); };
filter f_filter8   { facility(kern) and level(notice); };

filter f_mail { facility(mail); };
filter f_news { facility(news); };
filter f_auth { facility(auth); };
filter f_daem { facility(daemon) and 
level(info,warn,notice,err,crit,alert,emerg); };
filter f_ipf  { facility(local0); };

filter f_debug     { not facility(auth, news, mail, local0); };
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); };

log { source(local); filter(f_filter1); destination(d_cons); };
log { source(local); filter(f_filter2); destination(d_mesg); };
log { source(local); filter(f_filter3); destination(d_mlop); };
log { source(local); filter(f_filter4); destination(d_mlrt); };
log { source(local); filter(f_filter5); destination(d_mlal); };
log { source(local); filter(f_filter6); destination(d_cons);
                                        destination(d_mesg); };
log { source(local); filter(f_filter7); destination(d_mlop);
                                        destination(d_mlrt); };
log { source(local); filter(f_filter8); destination(d_auth); };

log { source(local); filter(f_auth); destination(d_auth); };
log { source(local); filter(f_daem); destination(d_daem); };
log { source(local); filter(f_mail); destination(d_mail); };
log { source(local); filter(f_news); destination(d_news); };
log { source(local); filter(f_ipf); destination(d_ipf); };

BigAdmin Feature Article Creating a Centralized Secure Log Server with syslog-ng and Stunnel

# Options
options {
          use_fqdn(yes);
          sync(0);
          keep_hostname(yes);
          chain_hostnames(no);
	  create_dirs(yes);
        };

# Sources of syslog messages (both local and remote messages on the server)
source s_local   { 
                   sun-streams("/dev/log" door("/etc/.syslog_door")); 
                   internal();
                 };
source s_stunnel { 
                   tcp(ip("127.0.0.1")
                   port(514)
                   max-connections(1));
                 };

source s_udp     { udp(); };

# Level Filters
filter f_emerg   { level (emerg);            };
filter f_alert   { level (alert .. emerg);   };
filter f_crit    { level (crit .. emerg);    };
filter f_err     { level (err .. emerg);     };
filter f_warning { level (warning .. emerg); };
filter f_notice  { level (notice .. emerg);  };
filter f_info    { level (info .. emerg);    };
filter f_debug   { level (debug .. emerg);   };

# Facility Filters
filter f_kern   { facility (kern);   };
filter f_user   { facility (user);   };
filter f_mail   { facility (mail);   };
filter f_daemon { facility (daemon); };
filter f_auth   { facility (auth);   };
filter f_syslog { facility (syslog); };
filter f_lpr    { facility (lpr);    };
filter f_news   { facility (news);   };
filter f_uucp   { facility (uucp);   };
filter f_cron   { facility (cron);   };
filter f_local0 { facility (local0); };
filter f_local1 { facility (local1); };
filter f_local2 { facility (local2); };
filter f_local3 { facility (local3); };
filter f_local4 { facility (local4); };
filter f_local5 { facility (local5); };
filter f_local6 { facility (local6); };
filter f_local7 { facility (local7); };

# Custom Filters
filter f_user_none     { not facility (user);                     };
filter f_kern_debug    { filter (f_kern) and filter (f_debug);    };
filter f_daemon_notice { filter (f_daemon) and filter (f_notice); };
filter f_mail_crit     { filter (f_mail) and filter (f_crit);     };
filter f_mesg          { filter (f_kern_debug) or 
                         filter (f_daemon_notice) or 
                         filter (f_mail_crit);                    };
filter f_authinfo      { filter (f_auth) or program (sudo);       };

# Destinations: local files, the console, and the client files
destination l_authlog  { file ("/var/log/authlog");   };
destination l_messages { file ("/var/log/messages");  };
destination l_maillog  { file ("/var/log/maillog");   };
destination l_ipflog   { file ("/var/log/ipflog");    };
destination l_imaplog  { file ("/var/log/imaplog");   };
destination l_syslog   { file ("/var/log/syslog");    };

destination l_console  { file ("/dev/console");       };

destination r_authlog  { file
  ("/var/log/clients/$YEAR/$MONTH/$HOST/authlog");    }; 
destination r_messages { file 
  ("/var/log/clients/$YEAR/$MONTH/$HOST/messages");   }; 
destination r_maillog  { file 
  ("/var/log/clients/$YEAR/$MONTH/$HOST/maillog");    }; 
destination r_ipflog   { file 
  ("/var/log/clients/$YEAR/$MONTH/$HOST/ipflog");     }; 
destination r_imaplog  { file 
  ("/var/log/clients/$YEAR/$MONTH/$HOST/imaplog");    }; 
destination r_console  { file 
  ("/var/log/clients/$YEAR/$MONTH/$HOST/consolelog"); }; 
destination r_syslog   { file
  ("/var/log/clients/$YEAR/$MONTH/$HOST/syslog");     };
destination r_fallback { file
  ("/var/log/clients/$YEAR/$MONTH/$HOST/$FACILITY-$LEVEL"); };

# Log statements
# Local sources
log { source (s_local); filter (f_authinfo)  destination (l_authlog);  };
log { source (s_local); filter (f_mail);     destination (l_maillog);  };
log { source (s_local); filter (f_local0);   destination (l_ipflog);   };
log { source (s_local); filter (f_local1);   destination (l_imaplog);  };
log { source (s_local); filter (f_syslog);   destination (l_syslog);   };
log { source (s_local); filter (f_emerg); filter (f_user_none); 
                                             destination (l_console);  };
log { source (s_local); filter (f_mesg);  filter (f_user_none);
                                             destination (l_messages); }; 

# All sources, since we want to archive local and remote logs
log { source (s_local); source (s_stunnel); filter (f_authinfo);
     destination (r_authlog);   };
log { source (s_local); source (s_stunnel); filter (f_mail);
     destination (r_maillog);   };
log { source (s_local); source (s_stunnel); filter (f_local0);
   destination (r_ipflog);      };
log { source (s_local); source (s_stunnel); filter (f_local1);
   destination (r_imaplog);     };
log { source (s_local); source (s_stunnel); filter (f_syslog);
   destination (r_syslog);      };
log { source (s_local); source (s_stunnel); filter (f_emerg); 
      filter (f_user_none);
      destination (l_console);  };
log { source (s_local); source (s_stunnel); filter (f_mesg);
   filter (f_user_none);
      destination (l_messages); };

In this example client syslog-ng.conf, the filters remain the same, but most other parts of the configuration either change to reflect the client status or are removed:

# Options
options { 
          sync(0);
          use_fqdn(yes);
        };

# Sources of syslog messages (only local on clients)
source s_local { 
                 sun-streams("/dev/log" door("/etc/.syslog_door")); 
                 internal();
               };

# Destinations: local files, the console, and the remote syslog server
destination l_authlog  { file ("/var/log/authlog");   };
destination l_messages { file ("/var/log/messages");  };
destination l_maillog  { file ("/var/log/maillog");   };
destination l_ipflog   { file ("/var/log/ipflog");    };
destination l_imaplog  { file ("/var/log/imaplog");   };
destination l_console  { file ("/dev/console");       };
destination l_syslog   { file ("/var/log/syslog");    };
destination stunnel    { tcp ("127.0.0.1", port(514)); };

# Level Filters
filter f_emerg   { level (emerg);            };
filter f_alert   { level (alert .. emerg);   };
filter f_crit    { level (crit .. emerg);    };
filter f_err     { level (err .. emerg);     };
filter f_warning { level (warning .. emerg); };
filter f_notice  { level (notice .. emerg);  };
filter f_info    { level (info .. emerg);    };
filter f_debug   { level (debug .. emerg);   };

# Facility Filters
filter f_kern   { facility (kern);   };
filter f_user   { facility (user);   };
filter f_mail   { facility (mail);   };
filter f_daemon { facility (daemon); };
filter f_auth   { facility (auth);   };
filter f_syslog { facility (syslog); };
filter f_lpr    { facility (lpr);    };
filter f_news   { facility (news);   };
filter f_uucp   { facility (uucp);   };
filter f_cron   { facility (cron);   };
filter f_local0 { facility (local0); };
filter f_local1 { facility (local1); };
filter f_local2 { facility (local2); };
filter f_local3 { facility (local3); };
filter f_local4 { facility (local4); };
filter f_local5 { facility (local5); };
filter f_local6 { facility (local6); };
filter f_local7 { facility (local7); }; 

# Custom Filters
filter f_user_none     { not facility (user);                     };
filter f_kern_debug    { filter (f_kern) and filter (f_debug);    };
filter f_daemon_notice { filter (f_daemon) and filter (f_notice); };
filter f_mail_crit     { filter (f_mail) and filter (f_crit);     };
filter f_mesg          { filter (f_kern_debug) or 
                         filter (f_daemon_notice) or 
                         filter (f_mail_crit);                    };
filter f_authinfo      { filter (f_auth) or program (sudo);       };

# Log statements
# Log things locally
log { source (s_local); filter (f_authinfo); destination (l_authlog);  };
log { source (s_local); filter (f_mail);     destination (l_maillog);  };
log { source (s_local); filter (f_local0);   destination (l_ipflog);   };
log { source (s_local); filter (f_local1);   destination (l_imaplog);  };
log { source (s_local); filter (f_syslog);   destination (l_syslog);   };
log { source (s_local); filter (f_emerg); filter (f_user_none); 
                                             destination (l_console);  };
log { source (s_local); filter (f_mesg); filter (f_user_none);
                                             destination (l_messages); }; 

# Log everything remotely via stunnel
log { source (s_local);                      destination (stunnel);    };



Etc

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The Last but not Least


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Last modified: July 01, 2014