I have log4Net set up with the following config settings in a web service web.config file:
<log4net>
<!-- RollingFile is set to be a File Appender -->
<appender name="RollingFile" type="log4net.Appender.RollingFileAppender">
<file value="c:\temp\Sync.log" />
<appendToFile value="true" />
<maximumFileSize value="50MB" />
<maxSizeRollBackups value="10" />
<datePattern value="yyyyMMdd" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date %-5level %-50logger - %message%newline%newline" />
</layout>
</appender>
<!-- Set root logger level to DEBUG to have all log -->
<root>
<level value="INFO" />
<appender-ref ref="RollingFile" />
</root>
The issue I am having is when I look in temp I see 17 files
Sync.Log
Sync.log20180424.log
(other sync files with dates)
...
the last one being
Sync.log20180405
I am confused as to why it is not removing the ones beyond 10 days as stated by the maxSizeRollBackups.
I know that by default the is rollingStyle = composite.
With my current config, how would it behave if I let it go?
And as a second - what am I missing in my current settings.
Thanks. I know there are similar questions out there but in reading them I feel like I am still missing something.
It turns out that what I was trying to do is not possible.
As stated in other places:
A maximum number of backup files when rolling on date/time boundaries is not supported.
Because of this, I took the date portion out so that the backups roll by size only. After doing that I did not have the same issues. I don't like the file name as much but it is still easy enough to track them based on their file properties having the date last edited.
Related
I'm using log4net in a c# windows service, so the main application runs every time. I configured log4net to log into a date specific directory. Inside this directory log4net creates a logfile with a timestamp in the filename. This works fine. The probem is, that it only creates a new logfile, when the windows service restarts. This causes the logfile to get very big, expecially if the service runs over several days.
The question is:
Is there a possibility to force log4net to start with a new logfile throughout my code.
This is my log4net config:
<log4net>
<appender name="FileAppender" type="log4net.Appender.FileAppender">
<file type="log4net.Util.PatternString" value="${ProgramData}\Sirona\Log\AcqSrv\%date{yyMMdd}\AcqSrvAll-%date{HHmmss}.log" />
<appendToFile value="true" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%2thread] [%-5level] [%logger] - %message%newline" />
</layout>
</appender>
<root>
<level value="ALL" />
<appender-ref ref="FileAppender" />
</root> <!-- Do not want NHibernate log -->
</log4net>
Best regards
Emu
I think your problem is solved by the RollingFileAppender: http://logging.apache.org/log4net/release/config-examples.html
http://logging.apache.org/log4net/release/sdk/log4net.Appender.RollingFileAppender.html
It works exactly as a FileAppender but once it reach a maximum size (configurable) it creates another log file.
You can also instruct it to keep only the latest X log files.
Hope it helps.
I have an Log4Net configuration that produces output as expected in a console application.
I have the exact same config, and invokation code (all done at the earliest point possible in the execution flow), but in the context of NUnit tests.
I know the configuration is loaded correctly. Additionally, I have turned the system diagnostics for Log4Net, and the debug prints are the exact same in both cases.
In the console application the text gets written. Otherwise, the file is empty.
The configuration code:
<log4net>
<!--APPENDERS-->
<!--Endpoint File Appender-->
<appender name="EndpointFileAppender" type="log4net.Appender.RollingFileAppender">
<file value="C:\Temp\Endpoint.log" />
<appendToFile value="true" />
<maximumFileSize value="100KB" />
<maxSizeRollBackups value="10" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%message" />
</layout>
</appender>
<!--LOGGERS-->
<logger name="EndpointLog">
<level value="ALL" />
<appender-ref ref="EndpointFileAppender" />
</logger>
The Invocation code (first thing at application boot):
log4net.Config.XmlConfigurator.Configure();
ILog log = LogManager.GetLogger("EndpointLog");
log.Info("Hello World.");
Any ideas? Thanks
Is it that you need a root section? Try adding this:
<root>
<level value="All" />
<appender-ref ref="EndpointFileAppender" />
</root>
When you are running in an unittest context, you need to copy the log4net config into the bin folder with your unittest dlls. You can do this by setting copy tot output folder on the log4net config.
I configured my log4net to watch on changes made to the app.config file.
[assembly: log4net.Config.XmlConfigurator(Watch = true)]
When I run my app and change things in the config file, these changes only take effect when I restart my app. Why could this be?
Is there also a way to tell log4net to watch on changes in the app.config? Like:
<appender name="FileAppender" type="log4net.Appender.FileAppender" >
<watch value="true" />
</appender>
------------- EDIT -------------
I tried now to use a separate config-file: log4net.config.
It looks like this:
<log4net>
<appender name="FileAppender" type="log4net.Appender.FileAppender">
<file value="c:\log.txt" />
<appendToFile value="true" />
<lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%d [%t] %-5p %c (line %L) -- %m%n" />
</layout>
</appender>
<root>
<appender-ref ref="FileAppender" />
</root>
</log4net>
In my assemblyInfo.cs I wrote the following:
[assembly: log4net.Config.XmlConfigurator(ConfigFile = "log4net.config", Watch = true)]
The class that logs to the file looks like this:
ILog myLogger = LogManager.GetLogger(typeof(Form1));
myLogger.Debug("test");
This works like the old version. logfile entries are made, but when I change my log4net.config during runtime, these changes are not applied.... "Watch=true" should enable that feature, right?
HA!, I was just encountering the same problem, running unit tests that require logging.
Adding this line fixed it:
log4net.Config.XmlConfigurator.Configure();
My App.config:
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
</configSections>
<log4net>
<appender name="RollingFileAppender" type="log4net.Appender.RollingFileAppender">
<file value="log.txt" />
<appendToFile value="true" />
<rollingStyle value="Size" />
<maxSizeRollBackups value="10" />
<maximumFileSize value="100KB" />
<staticLogFileName value="true" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
</layout>
</appender>
<root>
<level value="DEBUG" />
<appender-ref ref="RollingFileAppender" />
</root>
</log4net>
I also do have this:
[assembly: log4net.Config.XmlConfigurator(Watch = true)]
According to log4net documentation, the Watch feature does not work for application configuration files (app.config, web.config):
Because the System.Configuration API does not support reloading of the config file
the configuration settings cannot be watched using the
log4net.Config.XmlConfigurator.ConfigureAndWatch methods.
So if you need the log4net configuration to be re-configurable, you will need to place it in a separate XML file and your application needs to have sufficient permissions to read the file:
The file to read the configuration from can be specified using any of the log4net.Config.XmlConfigurator methods that accept a System.IO.FileInfo object. Because the file system can be monitored for file change notifications the ConfigureAndWatch methods can be used to monitor the configuration file for modifications and automatically reconfigure log4net.
Even though I'm terribly late to the party - here's, what helped me: a simple call to log4net.LogManager.GetLogger("DUMMY"); at the very beginning of my program. I put it in the very first line of program.cs's Main() method. No need to assign the logger to any object, merely a polite request to log4net to read the assembly's attributes as stated here.
Using attributes can be a clearer method for defining where the application's configuration will be loaded from. However it is worth noting that attributes are purely passive. They are information only. Therefore if you use configuration attributes you must invoke log4net to allow it to read the attributes. A simple call to LogManager.GetLogger will cause the attributes on the calling assembly to be read and processed. Therefore it is imperative to make a logging call as early as possible during the application start-up, and certainly before any external assemblies have been loaded and invoked.
So I already have nhibernate working which uses log4net, and my web.config currently looks like:
<log4net debug="false">
<appender name="console" type="log4net.Appender.ConsoleAppender, log4net">
<layout type="log4net.Layout.PatternLayout,log4net">
<param name="ConversionPattern" value="%d{ABSOLUTE} %-5p %c{1}:%L - %m%n"/>
</layout>
</appender>
<!-- Setup the root category, add the appenders and set the default priority -->
<root>
<priority value="INFO"/>
<appender-ref ref="console"/>
</root>
</log4net>
Now my current requirement is the ability to create a seperate log file for each major module that I have in my application.
Right now it seems to be just writing to console, but I need to add the ability to write to files.
What do I have to modify in my configuration to be able to do this?
I want to be able to, in my code, say I want to write to logfile "logfile_1", and if it doesn't exist, create it, otherwise just append to it.
Really simple, rinse and repeat as required for number of files you want, you can also associate namespaces with different files if you want them separated out that way but I find it easier just to use Log2Console to view the file all together.
<appender name="FileAppender" type="log4net.Appender.FileAppender">
<file value="k:\temp\log2console.log" />
<appendToFile value="true" />
<lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
<layout type="log4net.Layout.XmlLayoutSchemaLog4j" />
</appender>
Don't forget to add the appender-ref to your root section.
So I am trying to set up Log4Net in my Web .NET 4.0 application. I have added the correct .dll to my project and have appended the following to my Web.Config file as starters:
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
<root>
<level value="DEBUG" />
<appender-ref ref="RollingLogFileAppender" />
</root>
</configSections>
<log4net debug="true">
<appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
<file value="C:\\TestProj\\TestLog.txt" />
<appendToFile value="true" />
<rollingStyle value="Size" />
<maxSizeRollBackups value="10" />
<maximumFileSize value="10MB" />
<staticLogFileName value="true" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%-5p %d %5rms %-22.22c{1} %-18.18M - %m%n" />
</layout>
</appender>
However, if I append the "log4net" section to Web.Config, I will receive the error message
Unable to start debugging on the web server. See help for common
configuration problems.....
Make sure the server is running correctly. Verify there are no syntax
errors in the web.config........
NOTE
I can remove all the internals of this section and leave only the declaration:
<log4net></log4net>
and I will still get the same error.
Can someone give me some pointers on how to track down this error?
For developers who are not sure exactly how to get started following might be a help
ConfigSections in app.config
Remember to tell your application that a library is introducing a custom configuration section are you are intended to utilize, I am not perfectly sure if it is mandatory or not but I always use it as first section within root <configuration> tag.
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
</configSections>
log4net config in app.config
There are quite a variety of different appenders available in log4net but I usually use RollingFileAppender so I am using the same one in this sample, you can find rest of those here.
<log4net>
<!-- file appender -->
<appender name="RollingFileAppender" type="log4net.Appender.RollingFileAppender">
<file value="C:/logs/my_log_file.log"/>
<appendToFile value="true"/>
<rollingStyle value="Date"/>
<maxSizeRollBackups value="30"/>
<datePattern value=".yyyy-MM-dd"/>
<staticLogFileName value="true"/>
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger - %message%newline"/>
</layout>
</appender>
<root>
<level value="DEBUG"/>
<appender-ref ref="RollingFileAppender"/>
</root>
</log4net>
Update AssemblyInfo.cs file
I always miss this step whenever I have to create a new project. So remember you have to tell your application to watch for XMLConfigurator to perform configuration of log4net, so following line goes at the end of AssemblyInfo.cs file:
[assembly: log4net.Config.XmlConfigurator(Watch = true)]
Get Started
Remember to include the reference of log4net.dll then use following line of code to initialize logger within a class
private static ILog log = LogManager.GetLogger(typeof(MyClass));
And at the end lets use it like following
log.Info("Hello log4net");
Happy Logging :)
Take a look at a sample configurations at log4net documentation homepage.
Chances are you've misplaced required tags.