1. Log4net Rolling File Appender Config
2. Log4net Rolling File Appender Configuration Example

1. Log4Net RollingFileAppender multiple files RSS. Each log file has a class with code like the one below. What is happening is that the code is writing the same logging data across all of the log files (5 files) when it should be writing certain parts to each file. Can someone point me in the write direction as to what I am missing in the code below? Starain chen.
2. Log4Net appends the datepattern onto the file value, so you want the file extension on the former. – Craig Walker Oct 28 '11 at 5:04 Since I want to monitor a predictable log file name for the current day, I use for file value = logs/server.log. Then for datePattern value, I add a period before yyyy.
3. When rolling a backup file necessitates deleting an older backup file the file to be deleted is moved to a temporary name before being deleted. CAUTION A maximum number of backup files when rolling on date/time boundaries is not supported. Namespace: log4net.Appender. Assembly: log4net (in log4net.dll) See Also.
4. This given configuration roll over th log files based on log file size. I have configured the log file size to be 10 MB. Change it as per your requirement. We can configure rolling file appender in log4j.properties in given way.

On startup, log4net would generate the first filename in the rolling sequence. It would detect that that file already exist and would then decide to roll to the second file, but when that one also already exists, it does not decide to roll but instead clears it and overwrites everything in that second log file.

I would like to have files named for example:

dd.mm.yyyy.log

How is this possible with log4net?

JL.JL.

8 Answers

In your Log4net config file, use the following parameter with the RollingFileAppender:

MunMunPhilipp MNonkichiNonkichi

For a RollingLogFileAppender you also need these elements and values:

Using Log4Net 1.2.13 we use the following configuration settings to allow date time in the file name.

<file type='log4net.Util.PatternString' value='E:/logname-%utcdate{yyyy-MM-dd}.txt' />

Which will provide files in the following convention: logname-2015-04-17.txt

With this it's usually best to have the following to ensure you're holding 1 log per day.

If size of file is a concern the following allows 500 files of 5MB in size until a new day spawns. CountDirection allows Ascending or Descending numbering of files which are no longer current.

I ended up using (note the '.log' filename and the single quotes around 'myfilename_'):

This gives me:

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Autodesk quickcad for windows 7. I've tried all the answers, but there was always something missing and not functioning as expected for me.

Then I experimented a bit with the hints given in each answer and was successful with the following setting:

The issue with other combinations of parameters was that the latest file didn't have the time pattern, or that the time pattern was appended as .log20171215 which created a new file time (and a new file type!) each day - or both issues appeared.

Now with this setting you are getting files like this one:

LOG4NET_Sample_Activity-20171215.log

which is what I wanted.

To summarize:

• Don't put the date pattern in the <file value=.. attribute, just define it in the datePattern.

• Make sure you have the preserveLogFileNameExtensionvalue attribute set to true.

• Make sure you have the staticLogFileNamevalue set to false.

• Set the rollingStyle attribute value to Date.

MattMattFourat

Log4net Rolling File Appender Config

Fourat

Log4net Rolling File Appender Configuration Example

The extended configuration section in a previous response with

listed works but I did not have to use

. I think the RollingAppender must (logically) ignore that setting since by definition the file gets rebuilt each day when the application restarts/reused. Perhaps it does matter for immediate rollover EVERY time the application starts.

Not the answer you're looking for? Browse other questions tagged c#logginglog4netfilenames or ask your own question.

By Default we have the following values for following properties of a RollingFileAppender

• staticLogFileName = true
• countDirection = –1
• rollingStyle = Composite
• maxSizeRollBackups = 0 // be careful with this
• maximumFileSize = “10MB”
• datePattern = '.yyyy-MM-dd'

staticLogFileName indicates whether you need to keep writing (log) to the same file all the time. You will need to set it to false when using Date as the rolling style and you have large number of backups.

Optionally file.log.yyyy-mm-dd for current formated datePattern can by the currently logging file (or file.log.curSizeRollBackup (rollingStyle=Size) or even file.log.yyyy-mm-dd.curSizeRollBackup --- (rollingStyle=Composite)) This will make time based roll overs with a large number of backups much faster -- it won't have to rename all the backups!

Recommend to leave it at its default value “true”

countDirection when its value is –1, then newest logfile backup will always be file.log.1. hence this would involve more number of file renaming.

By default newer files have lower numbers. (countDirection < 0) ie. log.1 is most recent, log.5 is the 5th backup, etc.. countDirection > 0 does the opposite ie. log.1 is the first backup made, log.5 is the 5th backup made, etc. For infinite backups use countDirection > 0 to reduce rollOver costs.

rollingStyle can be either Date, Size or Composite. the default setting Composite, uses a combination of Size and Date settings. Thus if you have the datePattern set to “.yyyy-MM-dd” and maxSizeRollBackups set to 10, themn it will maintain 10 log backups for each day.

If you have the DatePattern set to “.yyyy-MM-dd HH:mm” and maxSizeRollbackups = 10 then it will maintain 10 logfile backups per minute

Samples:

This will create infinite file backups with the countdirection > 0 so that the newest file has the latest/greatest name i.e. log.5 for the newest backup (5th backup)

This is a Composite RollingFileAppender which keeps max of 10 1MB log backups every minute

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Posted on Tuesday, March 3, 2009 3:50 PM Back to top