Where does linux store my syslog

Question

I wrote a simple test application to log something in a log file  I am using linux mint and after the application executes I try to view the log using this command    tail -n 100  var log messages   but the file messages does not exist neither tested or something  Below you can find my code  Maybe I am doing something wrong  the file isn t stored there or I need to enable logging in linux mint    include  lt stdio h gt   include  lt stdlib h gt   include  lt syslog h gt   void init log         setlogmask LOG UPTO LOG NOTICE        openlog  testd  LOG CONS   LOG PID   LOG NDELAY  LOG LOCAL1      int main void         init log        printf  Session started         syslog LOG NOTICE   Session started          closelog         return EXIT SUCCESS

User · Answer

I m running Ubuntu under WSL Windows Subsystem for Linux  and systemctl start rsyslog didn t work for me   So what I did is this     service rsyslog start   Now syslog file will appear at  var log

User · Answer

On my Ubuntu machine  I can see the output at  var log syslog   On a RHEL CentOS machine  the output is found in  var log messages   This is controlled by the rsyslog service  so if this is disabled for some reason you may need to start it with systemctl start rsyslog   As noted by others  your syslog   output would be logged by the  var log syslog file  You can see system  user  and other logs at  var log   For more details  here s an interesting link

User · Answer

You have to tell the system what information to log and where to put the info  Logging is configured in the  etc rsyslog conf file  then restart rsyslog to load the new config  The default logging rules are usually in a  etc rsyslog d 50-default conf file

User · Answer

syslog   generates a log message  which will be distributed by syslogd   The file to configure syslogd is  etc syslog conf  This file will tell your where the messages are logged   How to change options in this file   Here you go http   www bo infn it alice alice-doc mll-doc duix admgde node74 html

User · Answer

In addition to the accepted answer  it is useful to know the following      Each of those functions should have manual pages associated with them    If you run man -k syslog  a keyword search of man pages  you will get a list of man pages that refer to  or are about syslog     man -k syslog logger  1            - a shell command interface to the syslog 3  system l    rsyslog conf  5      - rsyslogd 8  configuration file rsyslogd  8          - reliable and extended syslogd syslog  2            - read and or clear kernel message ring buffer  set c    syslog  3            - send messages to the system logger vsyslog  3           - send messages to the system logger   You need to understand the manual sections in order to delve further   Here s an excerpt from the man page for man  that explains man page sections    The table below shows the section numbers of the manual followed  by the types of pages they contain      1   Executable programs or shell commands    2   System calls  functions provided by the kernel     3   Library calls  functions within program libraries     4   Special files  usually found in  dev     5   File formats and conventions eg  etc passwd    6   Games    7   Miscellaneous   including  macro  packages and conven-        tions   e g  man 7   groff 7     8   System administration commands  usually only for root     9   Kernel routines  Non standard    To read the above run    man man    So  if you run man 3 syslog you get a full manual page for the syslog function that you called in your code   SYSLOG 3                 Linux Programmer s Manual                SYSLOG 3   NAME    closelog   openlog   syslog   vsyslog  - send messages to the system    logger  SYNOPSIS     include  lt syslog h gt      void openlog const char  ident  int option  int facility      void syslog int priority  const char  format           void closelog void        include  lt stdarg h gt      void vsyslog int priority  const char  format  va list ap     Not a direct answer but hopefully you will find this useful

User · Answer

Default log location  rhel  are  General messages    var log messages   Authentication messages    var log secure   Mail events    var log maillog   Check your  etc syslog conf or  etc syslog-ng conf  it depends on which of syslog facility you have installed   Example     cat  etc syslog conf   Log anything  except mail  of level info or higher    Don t log private authentication messages    info mail none authpriv none          var log messages    The authpriv file has restricted access  authpriv                                var log secure    Log all the mail messages in one place  mail                                    var log maillog   For a start  use this simplified approach                                           var log messages

User · Answer

Logging is very configurable in Linux  and you might want to look into your  etc syslog conf  or perhaps under  etc rsyslog d    Details depend upon the logging subsystem  and the distribution    Look also into files under  var log   and perhaps run dmesg for kernel logs

[c] Where does linux store my syslog?

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