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< div class = "section" id = "logger" >
< h1 > logger< a class = "headerlink" href = "#logger" title = "Permalink to this headline" > ¶< / a > < / h1 >
< blockquote >
< div > < p > Print the logger information, update the logger level< / p >
< / div > < / blockquote >
< div class = "section" id = "usage" >
< h2 > Usage< a class = "headerlink" href = "#usage" title = "Permalink to this headline" > ¶< / a > < / h2 >
< div class = "section" id = "print-the-logger-information" >
< h3 > Print the logger information< a class = "headerlink" href = "#print-the-logger-information" title = "Permalink to this headline" > ¶< / a > < / h3 >
< p > Take the following < code class = "docutils literal notranslate" > < span class = "pre" > logback.xml< / span > < / code > as an example:< / p >
< div class = "highlight-xml notranslate" > < div class = "highlight hljs" > < pre class = "xml" > < ?xml version=" 1.0" encoding=" UTF-8" ?>
< configuration>
< appender name=" APPLICATION" class=" ch.qos.logback.core.rolling.RollingFileAppender" >
< file> app.log< /file>
< rollingPolicy class=" ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy" >
< fileNamePattern> mylog-%d{yyyy-MM-dd}.%i.txt< /fileNamePattern>
< maxFileSize> 100MB< /maxFileSize>
< maxHistory> 60< /maxHistory>
< totalSizeCap> 2GB< /totalSizeCap>
< /rollingPolicy>
< encoder>
< pattern> %logger{35} - %msg%n< /pattern>
< /encoder>
< /appender>
< appender name=" ASYNC" class=" ch.qos.logback.classic.AsyncAppender" >
< appender-ref ref=" APPLICATION" />
< /appender>
< appender name=" CONSOLE" class=" ch.qos.logback.core.ConsoleAppender" >
< encoder>
< pattern> %-4relative [%thread] %-5level %logger{35} - %msg %n
< /pattern>
< charset> utf8< /charset>
< /encoder>
< /appender>
< root level=" INFO" >
< appender-ref ref=" CONSOLE" />
< appender-ref ref=" ASYNC" />
< /root>
< /configuration> < / pre > < / div >
< / div >
< p > The result of the < code class = "docutils literal notranslate" > < span class = "pre" > logger< / span > < / code > command:< / p >
< div class = "highlight-bash notranslate" > < div class = "highlight hljs" > < pre class = "bash" > [arthas@2062]$ logger
name ROOT
class ch.qos.logback.classic.Logger
classLoader sun.misc.Launcher$AppClassLoader@2a139a55
classLoaderHash 2a139a55
level INFO
effectiveLevel INFO
additivity true
codeSource file:/Users/hengyunabc/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar
appenders name CONSOLE
class ch.qos.logback.core.ConsoleAppender
classLoader sun.misc.Launcher$AppClassLoader@2a139a55
classLoaderHash 2a139a55
target System.out
name APPLICATION
class ch.qos.logback.core.rolling.RollingFileAppender
classLoader sun.misc.Launcher$AppClassLoader@2a139a55
classLoaderHash 2a139a55
file app.log
name ASYNC
class ch.qos.logback.classic.AsyncAppender
classLoader sun.misc.Launcher$AppClassLoader@2a139a55
classLoaderHash 2a139a55
appenderRef [APPLICATION]< / pre > < / div >
< / div >
< p > In the < code class = "docutils literal notranslate" > < span class = "pre" > appenders< / span > < / code > section:< / p >
< ul class = "simple" >
< li > < p > The target of < code class = "docutils literal notranslate" > < span class = "pre" > CONSOLE< / span > < / code > logger is < code class = "docutils literal notranslate" > < span class = "pre" > System.out< / span > < / code > < / p > < / li >
< li > < p > < code class = "docutils literal notranslate" > < span class = "pre" > APPLICATION< / span > < / code > logger is < code class = "docutils literal notranslate" > < span class = "pre" > RollingFileAppender< / span > < / code > , the file is < code class = "docutils literal notranslate" > < span class = "pre" > app.log< / span > < / code > < / p > < / li >
< li > < p > < code class = "docutils literal notranslate" > < span class = "pre" > ASYNC< / span > < / code > its < code class = "docutils literal notranslate" > < span class = "pre" > appenderRef< / span > < / code > is < code class = "docutils literal notranslate" > < span class = "pre" > APPLICATION< / span > < / code > , which means asynchronous output to the file< / p > < / li >
< / ul >
< / div >
< div class = "section" id = "view-logger-information-for-the-special-name" >
< h3 > View logger information for the special name< a class = "headerlink" href = "#view-logger-information-for-the-special-name" title = "Permalink to this headline" > ¶< / a > < / h3 >
< div class = "highlight-bash notranslate" > < div class = "highlight hljs" > < pre class = "bash" > [arthas@2062]$ logger -n org.springframework.web
name org.springframework.web
class ch.qos.logback.classic.Logger
classLoader sun.misc.Launcher$AppClassLoader@2a139a55
classLoaderHash 2a139a55
level null
effectiveLevel INFO
additivity true
codeSource file:/Users/hengyunabc/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar< / pre > < / div >
< / div >
< / div >
< div class = "section" id = "view-logger-information-for-the-special-classloader" >
< h3 > View logger information for the special classloader< a class = "headerlink" href = "#view-logger-information-for-the-special-classloader" title = "Permalink to this headline" > ¶< / a > < / h3 >
< div class = "highlight-bash notranslate" > < div class = "highlight hljs" > < pre class = "bash" > [arthas@2062]$ logger -c 2a139a55
name ROOT
class ch.qos.logback.classic.Logger
classLoader sun.misc.Launcher$AppClassLoader@2a139a55
classLoaderHash 2a139a55
level DEBUG
effectiveLevel DEBUG
additivity true
codeSource file:/Users/hengyunabc/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar
appenders name CONSOLE
class ch.qos.logback.core.ConsoleAppender
classLoader sun.misc.Launcher$AppClassLoader@2a139a55
classLoaderHash 2a139a55
target System.out
name APPLICATION
class ch.qos.logback.core.rolling.RollingFileAppender
classLoader sun.misc.Launcher$AppClassLoader@2a139a55
classLoaderHash 2a139a55
file app.log
name ASYNC
class ch.qos.logback.classic.AsyncAppender
classLoader sun.misc.Launcher$AppClassLoader@2a139a55
classLoaderHash 2a139a55
appenderRef [APPLICATION]< / pre > < / div >
< / div >
< / div >
< div class = "section" id = "update-logger-level" >
< h3 > Update logger level< a class = "headerlink" href = "#update-logger-level" title = "Permalink to this headline" > ¶< / a > < / h3 >
< div class = "highlight-bash notranslate" > < div class = "highlight hljs" > < pre class = "bash" > [arthas@2062]$ logger --name ROOT --level debug
update logger level success.< / pre > < / div >
< / div >
< / div >
< div class = "section" id = "view-the-logger-information-without-appenders" >
< h3 > View the logger information without appenders< a class = "headerlink" href = "#view-the-logger-information-without-appenders" title = "Permalink to this headline" > ¶< / a > < / h3 >
< p > By default, the < code class = "docutils literal notranslate" > < span class = "pre" > logger< / span > < / code > command only prints information about the logger with appenders. If you want to see information about loggers without < code class = "docutils literal notranslate" > < span class = "pre" > appender< / span > < / code > , you can use the parameter < code class = "docutils literal notranslate" > < span class = "pre" > --include-no-appender< / span > < / code > .< / p >
< p > Note that the output will usually be very long.< / p >
< div class = "highlight-bash notranslate" > < div class = "highlight hljs" > < pre class = "bash" > [arthas@2062]$ logger --include-no-appender
name ROOT
class ch.qos.logback.classic.Logger
classLoader sun.misc.Launcher$AppClassLoader@2a139a55
classLoaderHash 2a139a55
level DEBUG
effectiveLevel DEBUG
additivity true
codeSource file:/Users/hengyunabc/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar
appenders name CONSOLE
class ch.qos.logback.core.ConsoleAppender
classLoader sun.misc.Launcher$AppClassLoader@2a139a55
classLoaderHash 2a139a55
target System.out
name APPLICATION
class ch.qos.logback.core.rolling.RollingFileAppender
classLoader sun.misc.Launcher$AppClassLoader@2a139a55
classLoaderHash 2a139a55
file app.log
name ASYNC
class ch.qos.logback.classic.AsyncAppender
classLoader sun.misc.Launcher$AppClassLoader@2a139a55
classLoaderHash 2a139a55
appenderRef [APPLICATION]
name com
class ch.qos.logback.classic.Logger
classLoader sun.misc.Launcher$AppClassLoader@2a139a55
classLoaderHash 2a139a55
level null
effectiveLevel DEBUG
additivity true
codeSource file:/Users/hengyunabc/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar
name com.alibaba
class ch.qos.logback.classic.Logger
classLoader sun.misc.Launcher$AppClassLoader@2a139a55
classLoaderHash 2a139a55
level null
effectiveLevel DEBUG
additivity true
codeSource file:/Users/hengyunabc/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar
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