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Update logging documentation

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* docs/logging.html[.in] try to include a little more description about
  the corner cases, things someone might get hung up on on.
This commit is contained in:
Amy Griffis 2009-08-06 15:58:38 +02:00 committed by Daniel Veillard
parent 63fbcc6927
commit 7534be6fbc
2 changed files with 40 additions and 4 deletions
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22
docs/logging.html
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@ -147,24 +147,42 @@
<ul><li>LIBVIRT_DEBUG: it can take the four following values:
<ul><li>1 or "debug": asking the library to log every message emitted,
though the filters can be used to avoid filling up the output</li><li>2 or "info": log all non-debugging informations</li><li>3 or "warn": log warnings and errors, that's the default value</li><li>4 or "error": log only error messages</li></ul></li><li>LIBVIRT_LOG_FILTERS: allow to define logging filters</li><li>LIBVIRT_LOG_OUTPUTS: allow to define logging outputs</li></ul>
<p>Note that, for example, setting LIBVIRT_DEBUG= is the same as unset. If
you specify an invalid value, it will be ignored with a warning. If you
have an error in a filter or output string, some of the settings may be
applied up to the point at which libvirt encountered the error.</p>
<p>Similary the daemon logging behaviour can be tuned using 3 config
variables, stored in the configuration file:
</p>
<ul><li>log_level: accepts the following values:
<ul><li>4: only errors</li><li>3: warnings and errors</li><li>2: informations, warnings and errors</li><li>1: debug and everything</li></ul></li><li>log_filters: allow to define logging filters</li><li>log_outputs: allow to define logging outputs</li></ul>
<p>In both case the syntax for filters and outputs is similar.</p>
<p>When starting the libvirt daemon, any logging environment variable
settings will override settings in the config file. Command line options
take precedence over all. If no outputs are defined for libvirtd, it
defaults to logging to syslog when it is running as a daemon, or to
stderr when it is running in the foreground.</p>
<p>Libvirtd does not reload its logging configuration when issued a SIGHUP.
If you want to reload the configuration, you must do a <code>service
libvirtd restart</code> or manually stop and restart the daemon
yourself.</p>
<p>The syntax for filters and outputs is the same for both types of
variables.</p>
<p>The format for a filter is:</p>
<pre>x:name</pre>
<p>where <code>name</code> is a match string e.g. <code>remote</code> or
<code>qemu</code> and the x is the minimal level where matching messages
should be logged:</p>
<ul><li>1: DEBUG</li><li>2: INFO</li><li>3: WARNING</li><li>4: ERROR</li></ul>
<p>Multiple filter can be defined in a single string, they just need to be
<p>Multiple filters can be defined in a single string, they just need to be
separated by spaces, e.g: <code>"3:remote 4:event"</code> to only get
warning or errors from the remote layer and only errors from the event
layer.</p>
<p>
</p>
<p>If you specify a log priority in a filter that is below the default log
priority level, messages that match that filter will still be logged,
while others will not. In order to see those messages, you must also have
an output defined that includes the priority level of your filter.</p>
<p>The format for an output can be one of those 3 forms:</p>
<ul><li><code>x:stderr</code> output goes to stderr</li><li><code>x:syslog:name</code> use syslog for the output and use the
given <code>name</code> as the ident</li><li><code>x:file:file_path</code>output to a file, with the given

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docs/logging.html.in
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@ -44,6 +44,10 @@
<li>LIBVIRT_LOG_FILTERS: allow to define logging filters</li>
<li>LIBVIRT_LOG_OUTPUTS: allow to define logging outputs</li>
</ul>
<p>Note that, for example, setting LIBVIRT_DEBUG= is the same as unset. If
you specify an invalid value, it will be ignored with a warning. If you
have an error in a filter or output string, some of the settings may be
applied up to the point at which libvirt encountered the error.</p>
<p>Similary the daemon logging behaviour can be tuned using 3 config
variables, stored in the configuration file:
<ul>
@ -57,7 +61,17 @@
<li>log_filters: allow to define logging filters</li>
<li>log_outputs: allow to define logging outputs</li>
</ul>
<p>In both case the syntax for filters and outputs is similar.</p>
<p>When starting the libvirt daemon, any logging environment variable
settings will override settings in the config file. Command line options
take precedence over all. If no outputs are defined for libvirtd, it
defaults to logging to syslog when it is running as a daemon, or to
stderr when it is running in the foreground.</p>
<p>Libvirtd does not reload its logging configuration when issued a SIGHUP.
If you want to reload the configuration, you must do a <code>service
libvirtd restart</code> or manually stop and restart the daemon
yourself.</p>
<p>The syntax for filters and outputs is the same for both types of
variables.</p>
<p>The format for a filter is:</p>
<pre>x:name</pre>
<p>where <code>name</code> is a match string e.g. <code>remote</code> or
@ -69,10 +83,14 @@
<li>3: WARNING</li>
<li>4: ERROR</li>
</ul>
<p>Multiple filter can be defined in a single string, they just need to be
<p>Multiple filters can be defined in a single string, they just need to be
separated by spaces, e.g: <code>"3:remote 4:event"</code> to only get
warning or errors from the remote layer and only errors from the event
layer.<p>
<p>If you specify a log priority in a filter that is below the default log
priority level, messages that match that filter will still be logged,
while others will not. In order to see those messages, you must also have
an output defined that includes the priority level of your filter.</p>
<p>The format for an output can be one of those 3 forms:</p>
<ul>
<li><code>x:stderr</code> output goes to stderr</li>