Difference between revisions of "Installing a Logger"

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== Introduction ==
 
== Introduction ==
In case you ever need to view important system messages, it is a wise idea to install a system logger. System loggers create a log in ‘’/var/log’’ Several different loggers exist. Listed below are some of the more commonly used loggers:
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In case you ever need to view important system messages, it is a wise idea to install a system logger. System loggers create log files that contain system messages, and stores these logs in <code>/var/log</code>. Several different loggers exist. Listed below are some of the more commonly used loggers:
* '''Metalog''' - "Metalog is a modern replacement for syslogd and klogd. The logged messages can be dispatched according to their facility, urgency, program name and/or Perl-compatible regular expressions." ([http://metalog.sourceforge.net Metalog homepage])
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* '''{{Package|app-admin/metalog}}''' - "Metalog is a modern replacement for syslogd and klogd. The logged messages can be dispatched according to their facility, urgency, program name and/or Perl-compatible regular expressions." This is a good, light-weight logger that is often used for desktop systems. ([http://metalog.sourceforge.net Metalog homepage])
* '''Syslog-ng''' - "syslog-ng is the trusted log management infrastructure for hundreds of thousands of users worldwide. Organizations use syslog-ng to reliably and securely collect, process and store log messages from across their IT environments." ([http://balabit.com/network-security/syslog-ng])
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* '''{{Package|app-admin/syslog-ng}}''' - "syslog-ng is the trusted log management infrastructure for hundreds of thousands of users worldwide. Organizations use syslog-ng to reliably and securely collect, process and store log messages from across their IT environments." syslog-ng is often used when more advanced logging functionality is required, and is highly customizable. ([http://balabit.com/network-security/syslog-ng Syslog-ng homepage])
 
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* '''{{Package|app-admin/rsyslog}}''' - "rsyslog is an alternative logger to syslog-ng and offers many benefits over syslog-ng. rsyslog is also the default logger for the latest versions of Red Hat Enterprise Linux, as well as many other Linux distributions." ([http://wiki.archlinux.org/index.php/rsyslog Arch wiki page])
* '''Rsyslog'''
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== Installation and adding to runlevel ==
 
== Installation and adding to runlevel ==
 
To install a logger, run the following command:
 
To install a logger, run the following command:
 
<console>
 
<console>
# ##i## emerge --ask metalog
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###i## emerge --ask metalog
  
 
These are the packages that would be merged, in order:
 
These are the packages that would be merged, in order:
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Total: 1 package (1 new), Size of downloads: 353 kB
 
Total: 1 package (1 new), Size of downloads: 353 kB
Would you like to merge these packages? [Yes/No] # ##i## yes
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Would you like to merge these packages? [Yes/No] ##i## yes
 
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</console>
 
</console>
  
After installing the logger, we have to add its initialization script to RC’s default runlevel. The default runlevel, defined at /etc/runlevels/default, contains symbolic links to all system initialization scripts that are run by default. To add the logger to the runlevel and then start the logger, run the following:
+
After installing the logger, we have to add its initialization script to RC’s default runlevel. The default runlevel, defined at <code>/etc/runlevels/default</code>, contains symbolic links to all system initialization scripts that are run by default. To add the logger to the runlevel and then start the logger, run the following:
 
<console>
 
<console>
# ##i## rc-update add metalog default
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###i## rc-update add metalog default
 
  * service metalog added to runlevel default
 
  * service metalog added to runlevel default
# ##i## rc
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###i## rc
 
  * Starting metalog ...
 
  * Starting metalog ...
 
</console>
 
</console>
  
 
== Stopping the service ==
 
== Stopping the service ==
If, for whatever reason, you need to stop a service manually, you can run its initialization script directly from /etc/init.d:
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If you need to stop the service manually, you can run its initialization script directly from <code>/etc/init.d</code>:
 
<console>
 
<console>
# ##i##/etc/init.d/metalog stop
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###i## /etc/init.d/metalog stop
 
  * Stopping metalog ...
 
  * Stopping metalog ...
 
</console>
 
</console>
 +
 
[[Category:System]]
 
[[Category:System]]

Revision as of 23:51, 10 January 2014

Introduction

In case you ever need to view important system messages, it is a wise idea to install a system logger. System loggers create log files that contain system messages, and stores these logs in /var/log. Several different loggers exist. Listed below are some of the more commonly used loggers:

  • app-admin/metalog - "Metalog is a modern replacement for syslogd and klogd. The logged messages can be dispatched according to their facility, urgency, program name and/or Perl-compatible regular expressions." This is a good, light-weight logger that is often used for desktop systems. (Metalog homepage)
  • app-admin/syslog-ng - "syslog-ng is the trusted log management infrastructure for hundreds of thousands of users worldwide. Organizations use syslog-ng to reliably and securely collect, process and store log messages from across their IT environments." syslog-ng is often used when more advanced logging functionality is required, and is highly customizable. (Syslog-ng homepage)
  • app-admin/rsyslog - "rsyslog is an alternative logger to syslog-ng and offers many benefits over syslog-ng. rsyslog is also the default logger for the latest versions of Red Hat Enterprise Linux, as well as many other Linux distributions." (Arch wiki page)

Installation and adding to runlevel

To install a logger, run the following command:

# emerge --ask metalog

These are the packages that would be merged, in order:

Calculating dependencies... done!
[ebuild  N     ] app-admin/metalog-3-r1  USE="unicode" 353 kB

Total: 1 package (1 new), Size of downloads: 353 kB
Would you like to merge these packages? [Yes/No]  yes

After installing the logger, we have to add its initialization script to RC’s default runlevel. The default runlevel, defined at /etc/runlevels/default, contains symbolic links to all system initialization scripts that are run by default. To add the logger to the runlevel and then start the logger, run the following:

# rc-update add metalog default
 * service metalog added to runlevel default
# rc
 * Starting metalog ...

Stopping the service

If you need to stop the service manually, you can run its initialization script directly from /etc/init.d:

# /etc/init.d/metalog stop
 * Stopping metalog ...