Often in our production (or production-like) environments, Log4Net is appending the date multiple times to my log files, thus:
AppLog.2011.08.26.log
AppLog.2011.08.26.log.2011.08.26.log
AppLog.2011.08.26.log.2011.08.26.log.2011.08.26.log
etc.
The files are inconsistently sized and they never reach the 10 MB limit that is set for the maximumFileSize.
Here is my appender setup:
<appender name="AppLog" type="log4net.Appender.RollingFileAppender,log4net">
<file type="log4net.Util.PatternString" value="Logs/AppLog[%processid]" />
<appendToFile value="true"/>
<rollingStyle value="Composite"/>
<maximumFileSize value="10000KB"/>
<maxSizeRollBackups value="2"/>
<param name="DatePattern" value=".yyyy.MM.dd'.log'"/>
<param name="StaticLogFileName" value="false"/>
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date !! %thread !! %-5level !! %logger !! %property{NDC} !! %message%newline"/>
</layout>
</appender>
You specified [%processid] in the value for the log file name,
but in the example you provided for the resulting log file names there is no such value.
With this expander, the resulting name should be something like
AppLog[2156].2011.10.07.log
If you need the id in the filename, make sure to understand why it is not there. It is possible that you found the origin of the appending problem as well.
Or maybe this is not the appender configuration used to produce these logfiles.
Related
I've got an internal app which is using log4net for logging. I'd like the logs to be generated at %LOCALAPPDATA%\Vendor\App\application.log. Unfortunately, log4net is creating the log file at %APPDATA% instead. It's not a huge problem, because we really don't use roaming profiled here, but I don't like leaving little idiosyncrasies in my code if I can avoid it.
Any thoughts on how to get the file written to the location I specified without configuring log4net programattically and using pinvoke to get the path for XP?
Here's the appender section of my config file if it's any help:
<appender name="RollingFileAppender" type="log4net.Appender.RollingFileAppender">
<file value="${LOCALAPPDATA}\Vendor\App\application.log" />
<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%newline%message%newline" />
</layout>
</appender>
VERY late to the party here but I just came across this and the found the answer.
Seems you can use log4net.Util.PatternString to insert environment variables into the file path. So the OP's example becomes:
<appender name="RollingFileAppender" type="log4net.Appender.RollingFileAppender">
<file type="log4net.Util.PatternString" value="%env{LOCALAPPDATA}\Vendor\App\application.log" />
<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%newline%message%newline" />
</layout>
</appender>
Add type="log4net.Util.PatternString" to the file element and then specify the %env pattern specifier followed by the environment variable name in curly brackets.
If this isn't working, it would imply your environment variable is wrong.
Log4net does not have anything special in it to handle either appdata or localappdata. All it does is call System.Environment.GetEnvironmentVariables() to return a hashtable and performs substitution based on whatever values that returns.
And for everybody, that had the same problems as me:
doesnt get this to work even when using different cases: (e.g. LocalAppData, LOCALAPPDATA, localappdata)
can not use "util.PatternString" because config is done in code and not the log4net.config file
This can give you local app data or whatever enviroment variable path you want. Use lower case, e.g. "localappdata"!! Returns empty.string when it could not find it.
private static string GetLocalAppDataPath()
{
foreach (DictionaryEntry environmentVariable in Environment.GetEnvironmentVariables())
{
var environmentVariableString = environmentVariable.Key as string;
if (environmentVariableString?.ToLower() == "localappdata")
return (string) environmentVariable.Value;
}
return string.Empty;
}
I have implemented RollingFileAppender to log my ASP errors and it works fine.
Now I need to change the file names based on the date value. Currently my log file name is MyLog.log, it's max size is 1 MB and maxBackup is 10. Now I want my log files with date like MyLog_2011-12-29 for each day. I tried the below settings, but it's not appending the date value to the file name and it just creates the file as MyLog. Any suggestions?
EDITED
<appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
<file value="C:\\xxx\\ASPErrors\\LogFile"/>
<staticLogFileName value="false"/>
<appendToFile value="true"/>
<rollingStyle value="Composite"/>
<eventId value="5" />
<eventCategory value="ErrorLogging" />
<datePattern value="_yyyy-MM-dd'.log'" />
<maxSizeRollBackups value="10"/>
<maximumFileSize value="1MB"/>
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%-5p %d %5rms %-22.22c{1} %-18.18M - %m%n"/>
</layout>
</appender>
I think the problem is you have the "staticLogFileName" property twice in the config, the second one is overwriting the first.
I got this:
<appender name="iOsClients_Error" type="log4net.Appender.RollingFileAppender">
<file value="Logs/errors/error_"/>
<appendToFile value="true"/>
<rollingStyle value="Date"/>
<datePattern value="yyyyMMdd" />
<staticLogFileName value="false"/>
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%newline%newline%date [%thread] %-5level - %message%newline%newline%exception%newline%newline"/>
</layout>
</appender>
This will create a log file like: error_20110801
How can I get log4net to output text files or how can I get log4net to add the .txt file extension to these files?
I want this: error_20110801.txt
You can use something like this to accomplish that:
<file type="log4net.Util.PatternString" value="Logs/errors/error_%date{yyyyMMdd}.txt" />
They key here is to use the PatternString
The problem with
<file type="log4net.Util.PatternString" value="Logs/errors/error_%date{yyyyMMdd}.txt" />
is that if the server doesn't restart every day, the file will have the same date, so the same name. And the archived file will be like error_20130101.txt20130101 .
The solution to this is here actually : Setting a log file name to include current date in Log4j
I need my application to create a log file each time it runs.
My preferred format would be App.log.yyyy-MM-dd_HH-mm-ss. If that's not possible, I'd settle for App.log.yyyy-MM-dd.counter
This is my current appender configuration:
<appender name="File" type="log4net.Appender.RollingFileAppender">
<file value="App.log"/>
<rollingStyle value="Date"/>
<datePattern value=".yyyy-MM-dd_HH-mm-ss"/>
<staticLogFileName value="false"/>
<lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
</appender>
But it creates a random number of files based on the date and time.
I assume that the application should create only one log file every time it runs, so you do not need a rolling file appender (though my solution would apply for rolling file appenders as well):
<appender name="FileAppender" type="log4net.Appender.FileAppender">
<file type="log4net.Util.PatternString" value="c:\temp\App-%date{yyyy-MM-dd_HH-mm-ss}.log" />
<appendToFile value="true" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%2thread] %-5level - %message%newline" />
</layout>
</appender>
(Obviously you can use other your own layout and other settings for the file appender.)
Also note that you can set your rolling style as
rollingstyle="Once"
and it will create a new file every time it is run. If staticLogFileName is set to true (e.g., logname.log) the previous logs will be set to logname.log.1, logname.log.2, etc.
The number of files kept before overwriting the oldest (say, 10) can be controlled by setting
maxSizeRollBackups="10"
Edit:
My config, which creates a datestamped log per execution (unless one exists, in which case it follows the .1 rule, looks like this:
<appender name="RollingFileAppender" type="log4net.Appender.RollingFileAppender">
<file type="log4net.Util.PatternString" value="Logs\MyLog-%date{dd-MM-yyyy}.log" />
<appendToFile value="false" />
<maxSizeRollBackups value="-1" /> <!--infinite-->
<staticLogFileName value="true" />
<rollingStyle value="Once" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%-5level %date [%thread] %c{1} - %m%n" />
</layout>
</appender>
Not 100% sure if I need appendToFile="false" as the docs say that's done automatically when you use rollingStyle="Once", but this makes it clearer in any case.
It's documented from apache in the log4net docs at:
https://logging.apache.org/log4net/release/config-examples.html
ctrl+f for "per program execution"
<appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
<file value="logfile.txt" />
<appendToFile value="false" />
<rollingStyle value="Size" />
<maxSizeRollBackups value="-1" />
<maximumFileSize value="50GB" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
</layout>
</appender>
I want my logfile to look something like this:
2009-02-13.log
but the problem is that I can't seem to find any way to add the .log extension.
I've tried a lot of things but nothing helps.
This is what I have this far:
<appender name="RollingFileAppender" type="log4net.Appender.RollingFileAppender">
<file value="Logs/Log4Net/.log"/>
<appendToFile value="true"/>
<rollingStyle value="Date"/>
<datePattern value="yyyy-MM-dd" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline"/>
</layout>
</appender>
The other answers escape the "g" in "log" since "g" is a special character in datePattern. This isn't wrong, but I prefer to wrap the entire set of non-date characters in single quotes, like so:
<datePattern value="yyyy-MM-dd'.log'" />
This gives the same results, but is easier for me to manage. This way, I don't have to recall which specific characters are special for datePattern (the list is long and varied). If I forget one character then I don't run the risk of borking my file names; they're all nicely escaped en masse.
Try adding the .log extension to your date pattern like so and remove it from the file attribute.
<datePattern value="yyyy-MM-dd.lo\g"/>
...
<staticLogFileName value="false" />
log4net now also provides a PreserveLogFileNameExtension property that can force your .log extension to the end of the compound file name (including date pattern and/or size sequence number):
<file value="LogFiles/.log"/>
<preserveLogFileNameExtension value="true" />
<datePattern value="yyyy-MM-dd" />
add ".lo\g" to the end of your datepattern
This is my log file xml config.
The path to the log file is in the "file" tag
This will create a log file "2012-11-22.log" under the folder "LogFiles" in the route folder of my website.
NOTE: Make sure that the folder exists first!
<?xml version="1.0"?>
<configuration>
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
</configSections>
<log4net>
<root>
<level value="INFO"/>
<appender-ref ref="RollingFileAppender"/>
</root>
<appender name="RollingFileAppender" type="log4net.Appender.RollingFileAppender">
<file value="LogFiles/"/>
<appendToFile value="true"/>
<rollingStyle value="Date"/>
<maxSizeRollBackups value="5"/>
<maximumFileSize value="10MB"/>
<datePattern value="yyyy-MM-dd'.log'" />
<staticLogFileName value="false"/>
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %level %logger - %message%newline%exception"/>
</layout>
</appender>
</log4net>
</configuration>