Attempting to use log4net RollingFileAppender (by Date) to roll with same filename (except the last incremental number) and start over after "2" days of data. Both of these do not seem to work as desired.
When rolling by 'Date', is it possible to have the logs named as Test.log.1, Test.log.2, Test.log.3, etc..? Cannot use DatePattern to differentiate the files as I need to have the same file name, except for the last incremental number ('.n'). But without the DatePattern, it seems to overwrite files & does not use the incremental numbering.
With the DatePattern & using "MaxSizeRollBackups" to limit number of days, it does not seem to start over after the specified ("2") days. The logs keep getting created indefinetly.
Tried the below config with no luck. Any suggestions appreciated:
<param name="File" value="Test.log" />
<param name="AppendToFile" value="true" />
<param name="RollingStyle" value="Date" />
<param name="MaxSizeRollBackups" value="2" />
<param name="StaticLogFileName" value="true" />
<!--<param name="DatePattern" value="_yyyy-MM-dd" />-->
Thanks in advance!
Related
Does log4net support circular logging? (I think that's the right term.)
I want to maintain the last N entries in a log file. Say N=100. If I have 100 entries and then add a 101st, the desired behavior would be to delete the 1st entry from the top of the file and add the new log entry at the bottom, so that there is always 100 (or fewer) entries, with the oldest entry at the top and the newest at the bottom.
Basically, I want to record a couple of pieces of information to a file every minute. I only am interesting in seeing/keeping the last 100 entries. I could roll my own solution, but I'm already using log4net for logging other issues and was hoping I could use it for this purpose, as well.
Thanks
Out of the box solution would be RollingFileAppender with Size limit. You cannot specify how many entries you want to keep in the file, but if you play with the size (lets say 100KB), you can get what you want.
Here is an example:
<appender name="RollingFileAppender" type="log4net.Appender.RollingFileAppender">
<file value="log.txt" />
<appendToFile value="true" />
<rollingStyle value="Size" />
<maxSizeRollBackups value="0" />
<maximumFileSize value="100KB" />
<staticLogFileName value="true" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger - %message%newline" />
</layout>
</appender>
And some documentation about why setting maxSizeRollBackups is important in this case:
If set to zero, then there will be no backup files and the log file
will be truncated when it reaches MaxFileSize.
MaxSizeRollBackups RollingMode
I'm working on a wpf application that uses log4net. It currently logs to a single file and only rolls over when it grows too large. I am trying to modify this so that it grows over when the file grows too large, when the date changes, or when the application is relaunched.
I am trying to get output as close to the following as possible
App_2017-07-06.0.txt //First launch on 2017-07-06
App_2017-07-06.1.txt //Rollover due to size limit
App_2017-07-06.2.txt //Application relaunch
App_2017-07-06.3.txt //Rollover due to size limit
App_2017-07-07.0.txt //Rollover due to date change
App_2017-07-07.1.txt //Rollover due to size limit
App_2017-07-07.2.txt //Application relaunch - Currently Logging File
From what I understand from the documentation, The rolling style can be set to "compostite" to capture date and size or it can be set to "once" to capture application relaunches. It doesn't seem to have a way to do all 3: http://logging.apache.org/log4net/release/sdk/html/T_log4net_Appender_RollingFileAppender_RollingMode.htm
I got it to the point where everything looks correct and works except the application relaunch overwrites a pre existing file (I imagine because of the appendToFile property). I just cant seem to get it working the way I need to and I can't find any answers in the documentation.
This question seems to be trying to achieve a similar goal, but did not solve my problem:
How do I force a rollover at application startup with Log4net RolloverFileAppender?
Am I missing something? Is it just not possible to do this with log4net?
My current configuration
<appender name="RollingFileAppender" type="log4net.Appender.RollingFileAppender">
<file type="log4net.Util.PatternString" value="Log\App.txt" />
<appendToFile value="false" />
<rollingStyle value="Composite" />
<maximumFileSize value="10KB" />
<maxSizeRollBackups value="-1" />
<staticLogFileName value="false" />
<preserveLogFileNameExtension value="true" />
<countDirection value="1" />
<lockingModel type="log4net.Appender.RollingFileAppender+MinimalLock" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date %level User = %username Class = %property{ClassName} Method = %property{MethodName}%newlineMessage - %message%newline%exception%newline***************************************" />
</layout>
</appender>
My current output
App_2017-07-06.0.txt //First launch on 2017-07-06
App_2017-07-06.1.txt //Rollover due to size limit
App_2017-07-06.1.txt //Application relaunch - overwrites pre-existing file
App_2017-07-06.2.txt //Rollover due to size limit
App_2017-07-07.0.txt //Rollover due to date change
App_2017-07-07.1.txt //Rollover due to size limit
App_2017-07-07.1.txt //Application relaunch - overwrites pre-existing file - Currently logging file
As far as I know log4net copies the log file to xxxx.{number}.txt when it rolls over to the next file. So your first App_2017-07-06.1.txt was never created and is still called App_2017-07-06.txt when the application restarts. You have configured so App_2017-07-06.txt will be overridden and your first App_2017-07-06.1.txt was never created.
You can configure <appendToFile value="true" /> to not override the existing file.
We are using Log4Net in an asp.net service and would like to have the log files to be in the following format:
Name.Date.ProcessId.log.N
e.g. Service.20150123-09.776243.log.0
The RollingFileAppender needs to be of composite style to create new log file if either the date or size constraint is reached.
It's easy enough to have the processid first and then the date. We have that currently, but would prefer to have the date first so its easier to sort first by date.
I've tried various configuration but the nearest I could come up with is
Name.yyyyMMdd-HH.ProcessId.HH.log.N
<appender name="ServiceLogFileAppender" type="log4net.Appender.RollingFileAppender">
<file type="log4net.Util.PatternString">
<conversionPattern value="C:\Logs\Service.%date{yyyyMMdd-HH}.%processid" />
</file>
<param name="DatePattern" value=".HH.lo\g" />
<param name="AppendToFile" value="true" />
<param name="RollingStyle" value="Composite" />
<param name="StaticLogFileName" value="false" />
<param name="MaximumFileSize" value="10MB" />
<param name="CountDirection" value="1" />
<layout type="log4net.Layout.PatternLayout">
<param name="ConversionPattern" value="%d{MM/dd/yyyy HH:mm:ss fff},%X{Method},%X{TransID},%X{UserID},%X{DeviceID},%X{PID},%X{TH1},%m%n"/>
</layout>
</appender>
I need to have some valid date pattern in the DatePattern for it to work. Can't have just ".lo\g" there.
Adding the %processid in the DatePattern doesn't work.
But it would be ideal that way as we currently have a new log file every hour (because of our current DatePattern yyyyMMdd-HH). Probably variables in DatePattern won't work.
Setting the RollingStyle to "Size" makes above pattern work, but then new log files would be created based on Size and not Size and Date and we need it to be "composite".
Can log4net filter and replace matched log message?
<filter type="log4net.Filter.StringMatchFilter">
<param name="AcceptOnMatch" value="false" />
<param name="RegexToMatch" value="<Code>.*</Code>" />
</filter>
This code can match the ...content...of Code and not to write all message to file.
But, what I want is that save the message, and replace the content of Code with empty.
Thanks.
Never heard of such functionality in bundled filters.
You'll probably have to do the job yourself by subclassing log4Net.Filter.FilterSkeleton or StringMatchFilter.
Then in your XML, you'll only have to call
<filter type="Your.Application.TheFilterYouJustWrote">
<param name="AcceptOnMatch" value="false" />
<param name="RegexToMatch" value="<Code>.*</Code>" />
</filter>
I'd like to make a log4j output file that is XML and give it a root element.
Hence, I'd like it to start with a tag and end with a tag.
What do I put in my log4j.xml to make this happen?
Right now, all I have is this:
<appender name="FILE" class="org.apache.log4j.RollingFileAppender">
<param name="File" value="logs/file.log" />
<param name="Append" value="false" />
<param name="MaxFileSize" value="5000KB" />
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%m%n" />
</layout>
</appender>
Change that PatternLayout to an org.apache.log4j.xml.XMLLayout.
Have a look at the api of XMLLayout:
http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/xml/XMLLayout.html
It clearly explains that you need to include the resulting xml output within another document (by using xml entity). So in your parent document you can place a root element of your choice.
This will also allow you to use chain saw.