Is there a log4net pattern for machineName

Question

I'm having a hard time finding documentation on the various 'in the box' patterns like

%logger  
%level  
%timestamp

There is of course the example page but I'm not sure that's the full list of options.

I also know that it's possible to MDC parameters out of the app to the logger, but that involves a code change which is a different beast than a config change.

Is there a %machineName option, or machineIP option? The issue is that we have all our servers in the web farm log into the same database log, and we're now thinking that a disproportionate number of messages are coming from one machine.

score 13 · Answer 1 · answered Jun 17 '09 at 14:41

13

%property{log4net:HostName}

answered Jun 17 '09 at 14:41

JC.

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score 12 · Answer 2 · answered Jun 17 '09 at 14:56

12

What I did just stumble across is

<layout type="log4net.Layout.PatternLayout" value="${COMPUTERNAME}"/>

and that seems to be working --- wonder what the difference is between this and the other options suggested. like %property{log4net:HostName}

answered Jun 17 '09 at 14:56

Ralph Shillington

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${...} depends on environment variables. – Peter Lillevold Jun 18 '09 at 13:05
1

that works on all windows machines on which I tried. Very helpful! – Emmanuel Touzery Nov 23 '12 at 09:56
I like it, why take a dependency on a custom class if you don't have to? – Stan Bashtavenko Dec 08 '15 at 23:03
Your answer inspired me to get to this configuration that worked for me: – MundoPeter Mar 15 '21 at 20:23

Adauto · Answer 3 · 2012-03-08T18:25:28.743

Create a class that gets the machine name:

using System;
using System.IO;
using log4net.Layout.Pattern;

namespace YourNameSpace.Converters
{
    public class MachinePatternConverter : PatternLayoutConverter
    {
        protected override void Convert(TextWriter writer, log4net.Core.LoggingEvent loggingEvent)
        {
            writer.Write(Environment.MachineName);            
        }
    }
}

then set your log4net configuration like this:

<layout type="log4net.Layout.PatternLayout">
    <converter>
      <name value="machine" />
      <type value="YourNameSpace.MachinePatternConverter" />
    </converter>
    <conversionPattern value="%date [%thread] %level %logger %machine" />
</layout>

I like this approach as it can be reused and i can manage the information how i want. If you want to log the ip address for example, just do the same and create the converter like so:

public class IPPatternConverter : PatternLayoutConverter
{
    protected override void Convert(TextWriter writer, log4net.Core.LoggingEvent loggingEvent)
    {
        if (HttpContext.Current == null)
            return;

        writer.Write(HttpContext.Current.Request.UserHostAddress);
    }
}

More info on the link: http://devstuffs.wordpress.com/2012/01/12/creating-your-own-pattern-layout-converter-for-log4net/

score 2 · Answer 4 · edited Nov 12 '22 at 15:04

2

Check out the PatternString API, it looks like you would need to use %property in your pattern. Also take a look at this article, you may need to inject the machine name into the global context on application startup.

edited Nov 12 '22 at 15:04

Glorfindel

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answered Jun 17 '09 at 14:31

AgileJon

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@AgileJon -- that article was exactly what I was looking for! Thank you!!! – James Schek Feb 10 '10 at 22:54

score 2 · Answer 5 · edited May 23 '17 at 10:32

Using this answer https://stackoverflow.com/a/2096452/1224858 about adding GlobalContext properties, I was able to get this to work.

I added the following code in my class file:

log4net.GlobalContext.Properties["hostname"] = Environment.MachineName;

And then in the config file I can reference hostname and it will appear

<layout type="log4net.Layout.PatternLayout">
     <conversionPattern value="%date [%thread] %-5level %logger [%property{hostname}] - %message%newline" />
</layout>

Hope this helps.

score 0 · Answer 6 · answered Aug 10 '09 at 04:45

0

Interesting, I think this is the "Compact Parameter Syntax" check out the last section over here http://logging.apache.org/log4net/release/manual/configuration.html

answered Aug 10 '09 at 04:45

Storm

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Is there a log4net pattern for machineName

6 Answers6