Host

To configure this check for an Agent running on a host:

1. Edit the tomcat.d/conf.yaml file, in the conf.d/ folder at the root of your Agent’s configuration directory to collect Tomcat metrics and logs. See the sample tomcat.d/conf.yaml for all available configuration options.

2. Restart the Agent.

See the JMX Check documentation for a list of configuration options usable by all JMX-based checks.

List of metrics

The conf parameter is a list of metrics to be collected by the integration. Only two keys are allowed:

• include (mandatory): A dictionary of filters. Any attribute that matches these filters is collected unless it also matches the exclude filters (see below).
• exclude (optional): A dictionary of filters. Attributes that match these filters are not collected.

For a given bean, metrics get tagged in the following manner:

mydomain:attr0=val0,attr1=val1

In this example, your metric is mydomain (or some variation depending on the attribute inside the bean) and has the tags attr0:val0, attr1:val1, and domain:mydomain.

If you specify an alias in an include key that is formatted as camel case, it is converted to snake case. For example, MyMetricName is shown in Datadog as my_metric_name.

The attribute filter

The attribute filter can accept two types of values:

• A dictionary whose keys are attributes names (see below). For this case, you can specify an alias for the metric that becomes the metric name in Datadog. You can also specify the metric type as a gauge or counter. If you choose counter, a rate per second is computed for the metric.

  conf:
    - include:
      attribute:
        maxThreads:
          alias: tomcat.threads.max
          metric_type: gauge
        currentThreadCount:
          alias: tomcat.threads.count
          metric_type: gauge
        bytesReceived:
          alias: tomcat.bytes_rcvd
          metric_type: counter
  

• A list of attributes names (see below). For this case, the metric type is a gauge, and the metric name is jmx.\[DOMAIN_NAME].\[ATTRIBUTE_NAME].

  conf:
    - include:
      domain: org.apache.cassandra.db
      attribute:
        - BloomFilterDiskSpaceUsed
        - BloomFilterFalsePositives
        - BloomFilterFalseRatio
        - Capacity
        - CompressionRatio
        - CompletedTasks
        - ExceptionCount
        - Hits
        - RecentHitRate
  

Log collection

1. To submit logs to Datadog, Tomcat uses the log4j logger. For versions of Tomcat before 8.0, log4j is configured by default. For Tomcat 8.0+, you must configure Tomcat to use log4j, see Using Log4j. In the first step of those instructions, edit the log4j.properties file in the $CATALINA_BASE/lib directory as follows:

     log4j.rootLogger = INFO, CATALINA
   
     # Define all the appenders
     log4j.appender.CATALINA = org.apache.log4j.DailyRollingFileAppender
     log4j.appender.CATALINA.File = /var/log/tomcat/catalina.log
     log4j.appender.CATALINA.Append = true
   
     # Roll-over the log once per day
     log4j.appender.CATALINA.layout = org.apache.log4j.PatternLayout
     log4j.appender.CATALINA.layout.ConversionPattern = %d{yyyy-MM-dd HH:mm:ss} %-5p [%t] %c{1}:%L - %m%n
   
     log4j.appender.LOCALHOST = org.apache.log4j.DailyRollingFileAppender
     log4j.appender.LOCALHOST.File = /var/log/tomcat/localhost.log
     log4j.appender.LOCALHOST.Append = true
     log4j.appender.LOCALHOST.layout = org.apache.log4j.PatternLayout
     log4j.appender.LOCALHOST.layout.ConversionPattern = %d{yyyy-MM-dd HH:mm:ss} %-5p [%t] %c{1}:%L - %m%n
   
     log4j.appender.MANAGER = org.apache.log4j.DailyRollingFileAppender
     log4j.appender.MANAGER.File = /var/log/tomcat/manager.log
     log4j.appender.MANAGER.Append = true
     log4j.appender.MANAGER.layout = org.apache.log4j.PatternLayout
     log4j.appender.MANAGER.layout.ConversionPattern = %d{yyyy-MM-dd HH:mm:ss} %-5p [%t] %c{1}:%L - %m%n
   
     log4j.appender.HOST-MANAGER = org.apache.log4j.DailyRollingFileAppender
     log4j.appender.HOST-MANAGER.File = /var/log/tomcat/host-manager.log
     log4j.appender.HOST-MANAGER.Append = true
     log4j.appender.HOST-MANAGER.layout = org.apache.log4j.PatternLayout
     log4j.appender.HOST-MANAGER.layout.ConversionPattern = %d{yyyy-MM-dd HH:mm:ss} %-5p [%t] %c{1}:%L - %m%n
   
     log4j.appender.CONSOLE = org.apache.log4j.ConsoleAppender
     log4j.appender.CONSOLE.layout = org.apache.log4j.PatternLayout
     log4j.appender.CONSOLE.layout.ConversionPattern = %d{yyyy-MM-dd HH:mm:ss} %-5p [%t] %c{1}:%L - %m%n
   
     # Configure which loggers log to which appenders
     log4j.logger.org.apache.catalina.core.ContainerBase.[Catalina].[localhost] = INFO, LOCALHOST
     log4j.logger.org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/manager] =\
       INFO, MANAGER
     log4j.logger.org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/host-manager] =\
       INFO, HOST-MANAGER
   

   Then follow the remaining steps in the Tomcat docs for configuring log4j.

2. By default, Datadog’s integration pipeline support the following conversion patterns:

     %d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n
     %d [%t] %-5p %c - %m%n
   

   Clone and edit the integration pipeline if you have a different format. See Logging in Tomcat for details on Tomcat logging capabilities.

3. Collecting logs is disabled by default in the Datadog Agent, enable it in your datadog.yaml file:

   logs_enabled: true
   

4. Add this configuration block to your tomcat.d/conf.yaml file to start collecting your Tomcat Logs:

   logs:
     - type: file
       path: /var/log/tomcat/*.log
       source: tomcat
       service: "<SERVICE>"
       #To handle multi line that starts with yyyy-mm-dd use the following pattern
       #log_processing_rules:
       #  - type: multi_line
       #    name: log_start_with_date
       #    pattern: \d{4}\-(0?[1-9]|1[012])\-(0?[1-9]|[12][0-9]|3[01])
   

   Change the path and service parameter values and configure them for your environment. See the sample tomcat.yaml for all available configuration options.

5. Restart the Agent.

Containerized

For containerized environments, see the Autodiscovery with JMX guide.