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Options

News See also Recommended Links Manual Reference Recommended Papers Installation on Solaris 9
Options Configuring syslog-ng to send logs Filters Configuration Examples Tips History Humor

There are several options you can specify, which modifies the behaviour of syslog-ng. . The general syntax is here:

	  options { option1(params); option2(params); ... };
Each option may have parameters, just like in driver specification.  For example

options {
       create_dirs(yes);  # if a dir does not exist create it
       owner(root);       # owner of created files
       group(root);       # group of created files
       perm(0600);        # permissions of created files
       dir_perm(0700);    # permissions of created dirs
};

 

One of the most important options is sync(0) The number of lines buffered before written to file.For debugging use sync(0).

On heavy loaded LOGHOST server sync(100) can be beneficial (LOGHOST server usually never crushes, so the danger of losing information is minimal).
Name Accepted values Description
time_reopen() number The time to wait before a died connection is reestablished
time_reap() number The time to wait before an idle destination file is closed.
sync() number The number of lines buffered before written to file
mark() number The number of seconds between two MARK lines. NOTE: not implemented yet.
stats() number The number of seconds between two STATS.
log_fifo_size() number The number of lines fitting to the output queue
chain_hostnames() yes or no Enable or disable the chained hostname format.
keep_hostname() yes or no Enable or disable hostname rewriting.
check_hostname() yes or no Enable or disable whether the hostname contains valid characters.
bad_hostname() regular expression A regexp which matches hostnames which should not be taken as such.
create_dirs() yes or no Enable or disable directory creation for destination files.
owner() userid .
group() groupid .
perm() permission value .
dir_owner() userid .
dir_group() groupid .
dir_perm() permission value .
use_time_recvd() yes or no Use the time a message is received instead of the one specified in the message.
use_dns() yes or no Enable or disable DNS usage. syslog-ng blocks on DNS queries, so enabling DNS may lead to a Denial of Service attack. To prevent DoS, protect your syslog-ng network endpoint with firewall rules, and make sure that all hosts, which may get to syslog-ng is resolvable.
dns_cache() yes or no Enable or disable DNS cache usage.
dns_cache_size() number Number of hostnames in the DNS cache.
dns_cache_expire() number Number of seconds while a successful lookup is cached.
dns_cache_expire_failed() number Number of seconds while a failed lookup is cached.
log_msg_size() number Maximum length of message in bytes.
use_fqdn() yes or no Add Fully Qualified Domain Name instead of short hostname.
gc_idle_threshold() number Sets the threshold value for the garbage collector, when syslog-ng is idle. GC phase starts when the number of allocated objects reach this number. Default: 100.
gc_busy_threshold() number Sets the threshold value for the garbage collector, when syslog-ng is busy. GC phase starts when the number of allocated objects reach this number. Default: 3000.

Options in the comment block form

#  Options
#----------------------------------------------------------------------
#
#  Name                       Values   Description
#  -------------------------  -------  ------------------------------------
#  bad_hostname               reg exp  A regexp which matches hostnames
#                                      which should not be taken as such.
#  chain_hostnames            y/n      Enable or disable the chained
#                                      hostname format.
#  create_dirs                y/n      Enable or disable directory creation
#                                      for destination files.
#  dir_group                  groupid
#  dir_owner                  userid
#  dir_perm                   perm
#  dns_cache                  y/n      Enable or disable DNS cache usage.
#  dns_cache_expire           num      Number of seconds while a successful
#                                      lookup is cached.
#  dns_cache_expire_failed    num      Number of seconds while a failed
#                                      lookup is cached.
#  dns_cache_size             num      Number of hostnames in the DNS cache.
#  gc_busy_threshold          num      Sets the threshold value for the
#                                      garbage collector, when syslog-ng is
#                                      busy. GC phase starts when the number
#                                      of allocated objects reach this
#                                      number. Default: 3000.
#  gc_idle_threshold          num      Sets the threshold value for the
#                                      garbage collector, when syslog-ng is
#                                      idle. GC phase starts when the number
#                                      of allocated objects reach this
#                                      number. Default: 100.
#  group                      groupid
#  keep_hostname              y/n      Enable or disable hostname rewriting.
#                                      This means that if the log entry had
#                                      been passed through at least one other
#                                      logging system, the ORIGINAL hostname
#                                      will be kept attached to the log. 
#                                      Otherwise the last logger will be
#                                      considered the log entry owner and
#                                      the log entry will appear to have
#                                      come from that host.
#  log_fifo_size              num      The number of lines fitting to the
#                                      output queue
#  log_msg_size               num      Maximum length of message in bytes.
#  long_hostnames             on/off   This options appears to only really
#                                      have an affect on the local system.
#                                      which removes the source of the log.
#                                      As an example, normally the local
#                                      logs will state src@hostname, but
#                                      with this feature off, the source
#                                      is not reported.
#  mark                       num      The number of seconds between two
#                                      MARK lines. NOTE: not implemented
#                                      yet.
#  owner                      userid
#  perm                       perm
#  stats                      num      The number of seconds between two
#                                      STATS.
#  sync                       num      The number of lines buffered before
#                                      written to file
#  time_reap                  num      The time to wait before an idle
#                                      destination file is closed.
#  time_reopen                num      The time to wait before a died
#                                      connection is reestablished
#  use_dns                    y/n      Enable or disable DNS usage.
#                                      syslog-ng blocks on DNS queries,
#                                      so enabling DNS may lead to a
#                                      Denial of Service attack. To
#                                      prevent DoS, protect your
#                                      syslog-ng network endpoint with
#                                      firewall rules, and make sure that
#                                      all hosts, which may get to
#                                      syslog-ng is resolvable.
#  use_fqdn                   y/n      Add Fully Qualified Domain Name
#                                      instead of short hostname.
#  use_time_recvd             y/n      Use the time a message is
#                                      received instead of the one
#                                      specified in the message.
 



Etc

Society

Groupthink : Two Party System as Polyarchy : Corruption of Regulators : Bureaucracies : Understanding Micromanagers and Control Freaks : Toxic Managers :   Harvard Mafia : Diplomatic Communication : Surviving a Bad Performance Review : Insufficient Retirement Funds as Immanent Problem of Neoliberal Regime : PseudoScience : Who Rules America : Neoliberalism  : The Iron Law of Oligarchy : Libertarian Philosophy

Quotes

War and Peace : Skeptical Finance : John Kenneth Galbraith :Talleyrand : Oscar Wilde : Otto Von Bismarck : Keynes : George Carlin : Skeptics : Propaganda  : SE quotes : Language Design and Programming Quotes : Random IT-related quotesSomerset Maugham : Marcus Aurelius : Kurt Vonnegut : Eric Hoffer : Winston Churchill : Napoleon Bonaparte : Ambrose BierceBernard Shaw : Mark Twain Quotes

Bulletin:

Vol 25, No.12 (December, 2013) Rational Fools vs. Efficient Crooks The efficient markets hypothesis : Political Skeptic Bulletin, 2013 : Unemployment Bulletin, 2010 :  Vol 23, No.10 (October, 2011) An observation about corporate security departments : Slightly Skeptical Euromaydan Chronicles, June 2014 : Greenspan legacy bulletin, 2008 : Vol 25, No.10 (October, 2013) Cryptolocker Trojan (Win32/Crilock.A) : Vol 25, No.08 (August, 2013) Cloud providers as intelligence collection hubs : Financial Humor Bulletin, 2010 : Inequality Bulletin, 2009 : Financial Humor Bulletin, 2008 : Copyleft Problems Bulletin, 2004 : Financial Humor Bulletin, 2011 : Energy Bulletin, 2010 : Malware Protection Bulletin, 2010 : Vol 26, No.1 (January, 2013) Object-Oriented Cult : Political Skeptic Bulletin, 2011 : Vol 23, No.11 (November, 2011) Softpanorama classification of sysadmin horror stories : Vol 25, No.05 (May, 2013) Corporate bullshit as a communication method  : Vol 25, No.06 (June, 2013) A Note on the Relationship of Brooks Law and Conway Law

History:

Fifty glorious years (1950-2000): the triumph of the US computer engineering : Donald Knuth : TAoCP and its Influence of Computer Science : Richard Stallman : Linus Torvalds  : Larry Wall  : John K. Ousterhout : CTSS : Multix OS Unix History : Unix shell history : VI editor : History of pipes concept : Solaris : MS DOSProgramming Languages History : PL/1 : Simula 67 : C : History of GCC developmentScripting Languages : Perl history   : OS History : Mail : DNS : SSH : CPU Instruction Sets : SPARC systems 1987-2006 : Norton Commander : Norton Utilities : Norton Ghost : Frontpage history : Malware Defense History : GNU Screen : OSS early history

Classic books:

The Peter Principle : Parkinson Law : 1984 : The Mythical Man-MonthHow to Solve It by George Polya : The Art of Computer Programming : The Elements of Programming Style : The Unix Haterís Handbook : The Jargon file : The True Believer : Programming Pearls : The Good Soldier Svejk : The Power Elite

Most popular humor pages:

Manifest of the Softpanorama IT Slacker Society : Ten Commandments of the IT Slackers Society : Computer Humor Collection : BSD Logo Story : The Cuckoo's Egg : IT Slang : C++ Humor : ARE YOU A BBS ADDICT? : The Perl Purity Test : Object oriented programmers of all nations : Financial Humor : Financial Humor Bulletin, 2008 : Financial Humor Bulletin, 2010 : The Most Comprehensive Collection of Editor-related Humor : Programming Language Humor : Goldman Sachs related humor : Greenspan humor : C Humor : Scripting Humor : Real Programmers Humor : Web Humor : GPL-related Humor : OFM Humor : Politically Incorrect Humor : IDS Humor : "Linux Sucks" Humor : Russian Musical Humor : Best Russian Programmer Humor : Microsoft plans to buy Catholic Church : Richard Stallman Related Humor : Admin Humor : Perl-related Humor : Linus Torvalds Related humor : PseudoScience Related Humor : Networking Humor : Shell Humor : Financial Humor Bulletin, 2011 : Financial Humor Bulletin, 2012 : Financial Humor Bulletin, 2013 : Java Humor : Software Engineering Humor : Sun Solaris Related Humor : Education Humor : IBM Humor : Assembler-related Humor : VIM Humor : Computer Viruses Humor : Bright tomorrow is rescheduled to a day after tomorrow : Classic Computer Humor

The Last but not Least Technology is dominated by two types of people: those who understand what they do not manage and those who manage what they do not understand ~Archibald Putt. Ph.D


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Last modified: March, 12, 2019