183 lines
5.9 KiB
Plaintext
183 lines
5.9 KiB
Plaintext
= Logging
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Apache ActiveMQ Artemis uses the https://www.slf4j.org/[SLF4J] logging facade for logging, with the broker assembly providing https://logging.apache.org/log4j/2.x/manual/[Log4J 2] as the logging implementation.
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This is configurable via the `log4j2.properties` file found in the broker instance `etc` directory, which is configured by default to log to both the console and to a file.
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There are a handful of general loggers available:
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|===
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| Logger | Description
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| rootLogger
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| Logs any calls not handled by the Apache ActiveMQ Artemis loggers
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| org.apache.activemq.artemis.core.server
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| Logs the core server
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| org.apache.activemq.artemis.utils
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| Logs utility calls
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| org.apache.activemq.artemis.journal
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| Logs Journal calls
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| org.apache.activemq.artemis.jms
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| Logs JMS calls
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| org.apache.activemq.artemis.integration.bootstrap
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| Logs bootstrap calls
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| org.apache.activemq.audit.base
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| audit log.
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Disabled by default
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| org.apache.activemq.audit.resource
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| resource audit log.
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Disabled by default
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| org.apache.activemq.audit.message
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| message audit log.
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Disabled by default
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|===
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== Configuring a Specific Level for a Logger
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Sometimes it is necessary to get more detailed logs from a particular logger.
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For example, when you're trying to troublshoot an issue.
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Say you needed to get TRACE logging from the logger `org.foo`.
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Then you need to configure the logging level for the `org.foo` logger to `TRACE`, e.g.:
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----
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logger.my_logger_ref.name=org.foo
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logger.my_logger_ref.level=TRACE
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----
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== Configuration Reload
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Log4J2 has its own configuration file reloading mechanism, which is itself configured via the same log4j2.properties configuration file.
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To enable reload upon configuration updates, set the `monitorInterval` config property to the interval in seconds that the file should be monitored for updates, e.g.
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----
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# Monitor config file every 5 seconds for updates
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monitorInterval = 5
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----
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== Logging in a client application
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Firstly, if you want to enable logging on the client side you need to include a logging implementation in your application which supports the the SLF4J facade.
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Taking Log4J2 as an example logging implementation, since it used by the broker, when using Maven your client and logging dependencies might be e.g.:
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[,xml,subs="normal"]
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----
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<dependency>
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<groupId>org.apache.activemq</groupId>
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<artifactId>artemis-jms-client</artifactId>
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<version>{project-version}</version>
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</dependency>
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<dependency>
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<groupId>org.apache.logging.log4j</groupId>
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<artifactId>log4j-slf4j2-impl</artifactId>
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<version>{log4j-version}</version>
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</dependency>
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----
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The Log4J2 configuration can then be supplied via file called `log4j2.properties` on the classpath which will then be picked up automatically.
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Alternatively, use of a specific configuration file can be configured via system property `log4j2.configurationFile`, e.g.:
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----
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-Dlog4j2.configurationFile=file:///path/to/custom-log4j2-config.properties
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----
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The following is an example `log4j2.properties` for a client application, logging at INFO level to the console and a daily rolling file.
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----
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# Log4J 2 configuration
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# Monitor config file every X seconds for updates
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monitorInterval = 5
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rootLogger.level = INFO
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rootLogger.appenderRef.console.ref = console
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rootLogger.appenderRef.log_file.ref = log_file
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logger.activemq.name=org.apache.activemq
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logger.activemq.level=INFO
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# Console appender
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appender.console.type=Console
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appender.console.name=console
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appender.console.layout.type=PatternLayout
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appender.console.layout.pattern=%d %-5level [%logger] %msg%n
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# Log file appender
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appender.log_file.type = RollingFile
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appender.log_file.name = log_file
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appender.log_file.fileName = log/application.log
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appender.log_file.filePattern = log/application.log.%d{yyyy-MM-dd}
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appender.log_file.layout.type = PatternLayout
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appender.log_file.layout.pattern = %d %-5level [%logger] %msg%n
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appender.log_file.policies.type = Policies
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appender.log_file.policies.cron.type = CronTriggeringPolicy
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appender.log_file.policies.cron.schedule = 0 0 0 * * ?
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appender.log_file.policies.cron.evaluateOnStartup = true
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----
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== Configuring Broker Audit Logging
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There are 3 audit loggers that can be enabled separately and audit different types of broker events, these are:
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. *base*: This is a highly verbose logger that will capture most events that occur on JMX beans.
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. *resource*: This logs the creation of, updates to, and deletion of resources such as addresses and queues as well as authentication.
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The main purpose of this is to track console activity and access to the broker.
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. *message*: This logs the production and consumption of messages.
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[NOTE]
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====
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All extra logging will negatively impact performance.
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Whether or not the performance impact is "too much" will depend on your use-case.
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====
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These three audit loggers are disabled by default in the broker `log4j2.properties` configuration file:
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----
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...
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# Audit loggers: to enable change levels from OFF to INFO
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logger.audit_base.name = org.apache.activemq.audit.base
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logger.audit_base.level = OFF
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logger.audit_base.appenderRef.audit_log_file.ref = audit_log_file
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logger.audit_base.additivity = false
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logger.audit_resource.name = org.apache.activemq.audit.resource
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logger.audit_resource.level = OFF
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logger.audit_resource.appenderRef.audit_log_file.ref = audit_log_file
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logger.audit_resource.additivity = false
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logger.audit_message.name = org.apache.activemq.audit.message
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logger.audit_message.level = OFF
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logger.audit_message.appenderRef.audit_log_file.ref = audit_log_file
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logger.audit_message.additivity = false
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...
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----
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To _enable_ the audit log change the level to `INFO`, like this:
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----
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logger.audit_base.level = INFO
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...
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logger.audit_resource.level = INFO
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...
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logger.audit_message.level = INFO
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----
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The 3 audit loggers can be disable/enabled separately.
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Once enabled, all audit records are written into a separate log file (by default `audit.log`).
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== More on Log4J2 configuration:
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For more detail on configuring Log4J 2, see its https://logging.apache.org/log4j/2.x/manual/[manual].
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