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logger ​

查看logger信息，修改日志级别

命令选项 ​

命令选项描述
-c, --classloader <hash>指定ClassLoader实例的hash码
--classloaderClass <name>指定ClassLoader的类
--include-no-appender包含没有appender的logger，默认false，开启结果通常比较长
-l, --level <value>设置日志级别
-n, --name <value>日志名称
-h, --help帮助

示例 ​

注意

日志级别设置后，Arthas退出时不会还原日志级别，需要再次设置

bash
# 查看logger
[arthas@21536]$ logger
name                                   ROOT
class                                  ch.qos.logback.classic.Logger
classLoader                            sun.misc.Launcher$AppClassLoader@18b4aac2
classLoaderHash                        18b4aac2
level                                  INFO
effectiveLevel                         INFO
additivity                             true
codeSource                             file:/D:/.m2/repository/ch/qos/logback/logback-classic/1.2.5/logback-classic-1.2.5.jar
appenders                              name            STDOUT
                                       class           ch.qos.logback.core.ConsoleAppender
                                       classLoader     sun.misc.Launcher$AppClassLoader@18b4aac2
                                       classLoaderHash 18b4aac2
                                       target          System.out

# 指定名字查看logger
[arthas@21536]$ logger -n org.springframework
name                                   org.springframework
class                                  ch.qos.logback.classic.Logger
classLoader                            sun.misc.Launcher$AppClassLoader@18b4aac2
classLoaderHash                        18b4aac2
level                                  WARN
effectiveLevel                         WARN
additivity                             true
codeSource                             file:/D:/.m2/repository/ch/qos/logback/logback-classic/1.2.5/logback-classic-1.2.5.jar

# 查看指定ClassLoader的logger
[arthas@21536]$ logger -c 18b4aac2
name                                   ROOT
class                                  ch.qos.logback.classic.Logger
classLoader                            sun.misc.Launcher$AppClassLoader@18b4aac2
classLoaderHash                        18b4aac2
level                                  INFO
effectiveLevel                         INFO
additivity                             true
codeSource                             file:/D:/.m2/repository/ch/qos/logback/logback-classic/1.2.5/logback-classic-1.2.5.jar
appenders                              name            STDOUT
                                       class           ch.qos.logback.core.ConsoleAppender
                                       classLoader     sun.misc.Launcher$AppClassLoader@18b4aac2
                                       classLoaderHash 18b4aac2
                                       target          System.out

# 设置日志级别
[arthas@21536]$ logger -n org.springframework -l DEBUG
Update logger level success.

# 指定 classloader 更新 logger level
# 默认情况下，logger 命令会在 SystemClassloader 下执行，
# 如果应用是传统的war应用，或者 spring boot fat jar 启动的应用，那么需要指定 classloader。
[arthas@21536]$ logger -c 18b4aac2 -n ROOT -l DEBUG
Update logger level success.
# 查看logger
[arthas@21536]$ logger
name                                   ROOT
class                                  ch.qos.logback.classic.Logger
classLoader                            sun.misc.Launcher$AppClassLoader@18b4aac2
classLoaderHash                        18b4aac2
level                                  INFO
effectiveLevel                         INFO
additivity                             true
codeSource                             file:/D:/.m2/repository/ch/qos/logback/logback-classic/1.2.5/logback-classic-1.2.5.jar
appenders                              name            STDOUT
                                       class           ch.qos.logback.core.ConsoleAppender
                                       classLoader     sun.misc.Launcher$AppClassLoader@18b4aac2
                                       classLoaderHash 18b4aac2
                                       target          System.out

# 指定名字查看logger
[arthas@21536]$ logger -n org.springframework
name                                   org.springframework
class                                  ch.qos.logback.classic.Logger
classLoader                            sun.misc.Launcher$AppClassLoader@18b4aac2
classLoaderHash                        18b4aac2
level                                  WARN
effectiveLevel                         WARN
additivity                             true
codeSource                             file:/D:/.m2/repository/ch/qos/logback/logback-classic/1.2.5/logback-classic-1.2.5.jar

# 查看指定ClassLoader的logger
[arthas@21536]$ logger -c 18b4aac2
name                                   ROOT
class                                  ch.qos.logback.classic.Logger
classLoader                            sun.misc.Launcher$AppClassLoader@18b4aac2
classLoaderHash                        18b4aac2
level                                  INFO
effectiveLevel                         INFO
additivity                             true
codeSource                             file:/D:/.m2/repository/ch/qos/logback/logback-classic/1.2.5/logback-classic-1.2.5.jar
appenders                              name            STDOUT
                                       class           ch.qos.logback.core.ConsoleAppender
                                       classLoader     sun.misc.Launcher$AppClassLoader@18b4aac2
                                       classLoaderHash 18b4aac2
                                       target          System.out

# 设置日志级别
[arthas@21536]$ logger -n org.springframework -l DEBUG
Update logger level success.

# 指定 classloader 更新 logger level
# 默认情况下，logger 命令会在 SystemClassloader 下执行，
# 如果应用是传统的war应用，或者 spring boot fat jar 启动的应用，那么需要指定 classloader。
[arthas@21536]$ logger -c 18b4aac2 -n ROOT -l DEBUG
Update logger level success.