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Re: [libvirt] [PATCH 5/5] Update logging documentation



On Fri, Jul 31, 2009 at 05:57:48PM -0400, Amy Griffis wrote:
> Try to include a little more description about the corner cases,
> things someone might get hung up on on.
> ---
> 
>  docs/logging.html.in |   22 ++++++++++++++++++++--
>  1 files changed, 20 insertions(+), 2 deletions(-)
> 
> diff --git a/docs/logging.html.in b/docs/logging.html.in
> index fcd100f..1f3085d 100644
> --- a/docs/logging.html.in
> +++ b/docs/logging.html.in
> @@ -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 reload</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>

ACK

Daniel
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