java Log4j2 - 配置 RolloverStrategy 以删除旧的日志文件

Question

提问by MAREK

I'm trying to configure log4jto keep only specified amount of backup files or keep files that are not older than some age. Ultimately I want to have time [daily] based triggering policyand keep 30 backup files or delete files that are older then 30 days.

我正在尝试将log4j配置为仅保留指定数量的备份文件或保留不超过某个年龄的文件。最终，我希望有基于时间 [每天] 的触发策略并保留 30 个备份文件或删除 30 天之前的文件。

After doing some research I learned that I can't specify max number of backup files when using time policyhowever I came across this issue https://issues.apache.org/jira/browse/LOG4J2-435and this documentation fragment http://logging.apache.org/log4j/2.x/manual/appenders.html#CustomDeleteOnRolloverthat describes how to delete files based on their age and name pattern. Now I'm trying to apply this configuration in simple example that will create new backup file every minute and will automatically delete files that are older then 3 minutes. To do this I created simple maven project with following pom:

在做了一些研究之后，我了解到在使用时间策略时我无法指定备份文件的最大数量，但是我遇到了这个问题https://issues.apache.org/jira/browse/LOG4J2-435和这个文档片段http: //logging.apache.org/log4j/2.x/manual/appenders.html#CustomDeleteOnRollover描述了如何根据文件的年龄和名称模式删除文件。现在我正在尝试在简单的示例中应用此配置，该示例将每分钟创建一个新的备份文件，并将自动删除 3 分钟之前的文件。为此，我使用以下 pom 创建了简单的 maven 项目：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>test</groupId>
    <artifactId>test</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-api</artifactId>
            <version>2.5</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-core</artifactId>
            <version>2.5</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-dependency-plugin</artifactId>
                <executions>
                    <execution>
                        <id>copy-dependencies</id>
                        <phase>prepare-package</phase>
                        <goals>
                            <goal>copy-dependencies</goal>
                        </goals>
                        <configuration>
                            <outputDirectory>${project.build.directory}/lib</outputDirectory>
                            <overWriteReleases>false</overWriteReleases>
                            <overWriteSnapshots>false</overWriteSnapshots>
                            <overWriteIfNewer>true</overWriteIfNewer>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-jar-plugin</artifactId>
                <configuration>
                    <archive>
                        <manifest>
                            <addClasspath>true</addClasspath>
                            <classpathPrefix>lib/</classpathPrefix>
                            <mainClass>test.Main</mainClass>
                        </manifest>
                    </archive>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

log4j2.xml config file:

log4j2.xml 配置文件：

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="warn" name="MyApp" packages="">
    <Appenders>
        <RollingFile name="RollingFile" fileName="D:/app.log"
                     filePattern="D:/app-%d{yyyy-MM-dd-HH-mm-ss}.log">
            <PatternLayout>
                <Pattern>%d %p %c{1.} [%t] %m%n</Pattern>
            </PatternLayout>
            <Policies>
                <TimeBasedTriggeringPolicy interval="60" modulate="true"/>
                <!--<SizeBasedTriggeringPolicy size="250 MB"/>-->
            </Policies>
            <DefaultRolloverStrategy>
                <Delete basePath="D:" maxDepth="1">
                    <IfFileName glob="app-*.log" />
                    <IfLastModified age="3m" />
                </Delete>
            </DefaultRolloverStrategy>
        </RollingFile>
    </Appenders>
    <Loggers>
        <Root level="trace">
            <AppenderRef ref="RollingFile"/>
        </Root>
    </Loggers>
</Configuration>

and Main class:

和主类：

package test;


import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

/**
 * Created by mzurawski on 2015-12-22.
 */
public class Main {

    final static Logger logger = LogManager.getLogger(Main.class);

    public static void main(String[] args) {
        runMe("test");
    }

    private static void runMe(String parameterParam){
        String parameter;
        for(int i=0; i<100; ++i) {
            parameter = parameterParam + i;
            System.out.println("log iteration: "+i);
            if (logger.isDebugEnabled()) {
                logger.debug("This is debug : " + parameter);
            }

            if (logger.isInfoEnabled()) {
                logger.info("This is info : " + parameter);
            }

            logger.warn("This is warn : " + parameter);
            logger.error("This is error : " + parameter);
            logger.fatal("This is fatal : " + parameter);
            try {
                Thread.sleep(60000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}

after building this program you can run it with following command (watch out for hard coded disc locations):

构建此程序后，您可以使用以下命令运行它（注意硬编码磁盘位置）：

java -jar test-1.0-SNAPSHOT.jar

So far the log files are created every minute but no old files are being deleted. How can I get this test configuration to work? How should I modify this configuration so that ultimately only files from last 30 days will be kept?

到目前为止，日志文件每分钟创建一次，但没有删除旧文件。我怎样才能让这个测试配置工作？我应该如何修改此配置，以便最终只保留过去 30 天的文件？

Thanks for any help.

谢谢你的帮助。

Answer 1

回答by Remko Popma

Your configuration and test program look fine. I tested your Main.java and log4j2.xml configuration and it works as expected: every minute the rollover is triggered, the Delete action scans the base directory and deletes only files older than 3 minutes.

您的配置和测试程序看起来不错。我测试了您的 Main.java 和 log4j2.xml 配置，它按预期工作：每分钟触发翻转，删除操作都会扫描基本目录并仅删除超过 3 分钟的文件。

I did not create a standalone app, but tested in my IDE instead. (Looks like you are shading the log4j jar files and your class and config into a single jar. Could that cause the issue?)

我没有创建独立的应用程序，而是在我的 IDE 中进行了测试。（看起来你正在将 log4j jar 文件和你的类和配置隐藏到一个 jar 中。这会导致问题吗？）

After enabling log4j internal logging by changing the config to <Configuration status="TRACE" ..., I get the following output:

通过将配置更改为启用 log4j 内部日志记录后<Configuration status="TRACE" ...，我得到以下输出：

Iteration 3: no files are deleted yet: oldest file is 173 seconds old.
Iteration 4: the oldest file is deleted.

迭代 3：还没有文件被删除：最旧的文件是 173 秒。
迭代 4：删除最旧的文件。

... (startup log omitted)...

...（省略启动日志）...

log iteration: 3
2016-01-16 14:26:23,192 main TRACE PatternProcessor.getNextTime returning 2016/01/16-14:27:00.000, nextFileTime=2016/01/16-14:26:59.000, prevFileTime=2016/01/16-14:25:59.000, current=2016/01/16-14:26:23.192, freq=EVERY_SECOND
2016-01-16 14:26:23,193 main TRACE DefaultRolloverStrategy.purge() took 0.0 milliseconds
2016-01-16 14:26:23,194 main DEBUG RollingFileManager executing synchronous FileRenameAction[c:\temp\log\app.log to c:\temp\log\app-2016-01-16-14-25-59.log, renameEmptyFiles=false]
2016-01-16 14:26:23,198 main DEBUG RollingFileManager executing async CompositeAction[DeleteAction[basePath=c:\temp\log, options=[], maxDepth=1, conditions=[IfFileName(glob:app-*.log), IfLastModified(age=PT3M)]]]
2016-01-16 14:26:23,199 Log4j2-2 DEBUG Starting DeleteAction[basePath=c:\temp\log, options=[], maxDepth=1, conditions=[IfFileName(glob:app-*.log), IfLastModified(age=PT3M)]]
2016-01-16 14:26:23,200 Log4j2-2 DEBUG DeleteAction complete in 0.001186309 seconds
2016-01-16 14:26:23,201 Log4j2-2 TRACE Sorted paths:
2016-01-16 14:26:23,201 Log4j2-2 TRACE c:\temp\log\app.log (modified: 2016-01-16T05:26:23.199631Z)
2016-01-16 14:26:23,201 Log4j2-2 TRACE c:\temp\log\app-2016-01-16-14-25-59.log (modified: 2016-01-16T05:25:30.832634Z)
2016-01-16 14:26:23,203 Log4j2-2 TRACE c:\temp\log\app-2016-01-16-14-24-59.log (modified: 2016-01-16T05:25:23.188525Z)
2016-01-16 14:26:23,203 Log4j2-2 TRACE c:\temp\log\app-2016-01-16-14-23-59.log (modified: 2016-01-16T05:23:29.466887Z)
2016-01-16 14:26:23,204 Log4j2-2 TRACE IfFileName REJECTED: 'glob:app-*.log' does not match relative path 'app.log'
2016-01-16 14:26:23,204 Log4j2-2 TRACE Not deleting base=c:\temp\log, relative=app.log
2016-01-16 14:26:23,205 Log4j2-2 TRACE IfFileName ACCEPTED: 'glob:app-*.log' matches relative path 'app-2016-01-16-14-25-59.log'
2016-01-16 14:26:23,205 Log4j2-2 TRACE IfLastModified REJECTED: app-2016-01-16-14-25-59.log ageMillis '52373' < 'PT3M'
2016-01-16 14:26:23,205 Log4j2-2 TRACE Not deleting base=c:\temp\log, relative=app-2016-01-16-14-25-59.log
2016-01-16 14:26:23,206 Log4j2-2 TRACE IfFileName ACCEPTED: 'glob:app-*.log' matches relative path 'app-2016-01-16-14-24-59.log'
2016-01-16 14:26:23,206 Log4j2-2 TRACE IfLastModified REJECTED: app-2016-01-16-14-24-59.log ageMillis '60018' < 'PT3M'
2016-01-16 14:26:23,206 Log4j2-2 TRACE Not deleting base=c:\temp\log, relative=app-2016-01-16-14-24-59.log
2016-01-16 14:26:23,206 Log4j2-2 TRACE IfFileName ACCEPTED: 'glob:app-*.log' matches relative path 'app-2016-01-16-14-23-59.log'
2016-01-16 14:26:23,207 Log4j2-2 TRACE IfLastModified REJECTED: app-2016-01-16-14-23-59.log ageMillis '173740' < 'PT3M'
2016-01-16 14:26:23,207 Log4j2-2 TRACE Not deleting base=c:\temp\log, relative=app-2016-01-16-14-23-59.log
log iteration: 4
2016-01-16 14:27:23,200 main TRACE PatternProcessor.getNextTime returning 2016/01/16-14:28:00.000, nextFileTime=2016/01/16-14:27:59.000, prevFileTime=2016/01/16-14:26:59.000, current=2016/01/16-14:27:23.200, freq=EVERY_SECOND
2016-01-16 14:27:23,201 main TRACE DefaultRolloverStrategy.purge() took 0.0 milliseconds
2016-01-16 14:27:23,202 main DEBUG RollingFileManager executing synchronous FileRenameAction[c:\temp\log\app.log to c:\temp\log\app-2016-01-16-14-26-59.log, renameEmptyFiles=false]
2016-01-16 14:27:23,204 main DEBUG RollingFileManager executing async CompositeAction[DeleteAction[basePath=c:\temp\log, options=[], maxDepth=1, conditions=[IfFileName(glob:app-*.log), IfLastModified(age=PT3M)]]]
2016-01-16 14:27:23,205 Log4j2-3 DEBUG Starting DeleteAction[basePath=c:\temp\log, options=[], maxDepth=1, conditions=[IfFileName(glob:app-*.log), IfLastModified(age=PT3M)]]
2016-01-16 14:27:23,207 Log4j2-3 DEBUG DeleteAction complete in 0.001230382 seconds
2016-01-16 14:27:23,207 Log4j2-3 TRACE Sorted paths:
2016-01-16 14:27:23,207 Log4j2-3 TRACE c:\temp\log\app.log (modified: 2016-01-16T05:27:23.20571Z)
2016-01-16 14:27:23,208 Log4j2-3 TRACE c:\temp\log\app-2016-01-16-14-26-59.log (modified: 2016-01-16T05:26:23.946671Z)
2016-01-16 14:27:23,208 Log4j2-3 TRACE c:\temp\log\app-2016-01-16-14-25-59.log (modified: 2016-01-16T05:25:30.832634Z)
2016-01-16 14:27:23,209 Log4j2-3 TRACE c:\temp\log\app-2016-01-16-14-24-59.log (modified: 2016-01-16T05:25:23.188525Z)
2016-01-16 14:27:23,209 Log4j2-3 TRACE c:\temp\log\app-2016-01-16-14-23-59.log (modified: 2016-01-16T05:23:29.466887Z)
2016-01-16 14:27:23,210 Log4j2-3 TRACE IfFileName REJECTED: 'glob:app-*.log' does not match relative path 'app.log'
2016-01-16 14:27:23,210 Log4j2-3 TRACE Not deleting base=c:\temp\log, relative=app.log
2016-01-16 14:27:23,211 Log4j2-3 TRACE IfFileName ACCEPTED: 'glob:app-*.log' matches relative path 'app-2016-01-16-14-26-59.log'
2016-01-16 14:27:23,211 Log4j2-3 TRACE IfLastModified REJECTED: app-2016-01-16-14-26-59.log ageMillis '59265' < 'PT3M'
2016-01-16 14:27:23,211 Log4j2-3 TRACE Not deleting base=c:\temp\log, relative=app-2016-01-16-14-26-59.log
2016-01-16 14:27:23,212 Log4j2-3 TRACE IfFileName ACCEPTED: 'glob:app-*.log' matches relative path 'app-2016-01-16-14-25-59.log'
2016-01-16 14:27:23,212 Log4j2-3 TRACE IfLastModified REJECTED: app-2016-01-16-14-25-59.log ageMillis '112380' < 'PT3M'
2016-01-16 14:27:23,212 Log4j2-3 TRACE Not deleting base=c:\temp\log, relative=app-2016-01-16-14-25-59.log
2016-01-16 14:27:23,213 Log4j2-3 TRACE IfFileName ACCEPTED: 'glob:app-*.log' matches relative path 'app-2016-01-16-14-24-59.log'
2016-01-16 14:27:23,213 Log4j2-3 TRACE IfLastModified REJECTED: app-2016-01-16-14-24-59.log ageMillis '120025' < 'PT3M'
2016-01-16 14:27:23,213 Log4j2-3 TRACE Not deleting base=c:\temp\log, relative=app-2016-01-16-14-24-59.log
2016-01-16 14:27:23,214 Log4j2-3 TRACE IfFileName ACCEPTED: 'glob:app-*.log' matches relative path 'app-2016-01-16-14-23-59.log'
2016-01-16 14:27:23,214 Log4j2-3 TRACE IfLastModified ACCEPTED: app-2016-01-16-14-23-59.log ageMillis '233748' >= 'PT3M'
2016-01-16 14:27:23,214 Log4j2-3 TRACE Deleting c:\temp\log\app-2016-01-16-14-23-59.log

Can you enable status logging and show your output?

您可以启用状态日志记录并显示您的输出吗？

java Log4j2 - 配置 RolloverStrategy 以删除旧的日志文件

提问by MAREK

回答by Remko Popma

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回答by Remko Popma

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