Apache Tomcat

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The Apache Tomcat integration collects traffic-related metrics, such as the number of active sessions or network throughput. The integration also collects access and Catalina logs. Access logs are parsed into a JSON payload focused on request details, whereas Catalina logs are parsed for general details. The tomcat receiver collects telemetry from the Tomcat server's Java Virtual Machine (JVM) via JMX.

For more information about Tomcat, see the Apache Tomcat documentation.

Prerequisites

To collect Tomcat telemetry, you must install the Ops Agent:

  • For metrics, install version 2.9.0 or higher.
  • For logs, install version 2.9.0 or higher.

This integration supports Tomcat versions 10.x and 9.0.x.

Configure your Tomcat instance

To expose a JMX endpoint, you must set the com.sun.management.jmxremote.port system property when starting the JVM. We also recommend setting the com.sun.management.jmxremote.rmi.port system property to the same port. To expose a JMX endpoint remotely, you must also set the java.rmi.server.hostname system property.

By default, these properties are set in a Tomcat deployment's tomcat-env.sh file.

To set system properties by using command-line arguments, prepend the property name with -D when starting the JVM. For example, to set com.sun.management.jmxremote.port to port 8050, specify the following when starting the JVM:

-Dcom.sun.management.jmxremote.port=8050

Configure the Ops Agent for Tomcat

Following the guide for Configuring the Ops Agent, add the required elements to collect telemetry from Tomcat instances, and restart the agent.

Example configuration

The following commands create the configuration to collect and ingest telemetry for Tomcat and restarts the Ops Agent.

# Configures Ops Agent to collect telemetry from the app and restart Ops Agent.

set -e

# Create a back up of the existing file so existing configurations are not lost.
sudo cp /etc/google-cloud-ops-agent/config.yaml /etc/google-cloud-ops-agent/config.yaml.bak

# Configure the Ops Agent.
sudo tee /etc/google-cloud-ops-agent/config.yaml > /dev/null << EOF
metrics:
  receivers:
    tomcat:
      type: tomcat
      endpoint: service:jmx:rmi:///jndi/rmi://127.0.0.1:8050/jmxrmi
  service:
    pipelines:
      tomcat:
        receivers:
          - tomcat

logging:
  receivers:
    tomcat_access:
      type: tomcat_access
    tomcat_system:
      type: tomcat_system
  service:
    pipelines:
      tomcat:
        receivers:
          - tomcat_access
          - tomcat_system
EOF

sudo service google-cloud-ops-agent restart
sleep 60

Configure logs collection

To ingest logs from Tomcat, you must create receivers for the logs that Tomcat produces and then create a pipeline for the new receivers.

To configure a receiver for your tomcat_system logs, specify the following fields:

Field Default Description
exclude_paths A list of filesystem path patterns to exclude from the set matched by include_paths.
include_paths [/opt/tomcat/logs/catalina.out] A list of filesystem paths to read by tailing each file. A wild card (*) can be used in the paths.
record_log_file_path false If set to true, then the path to the specific file from which the log record was obtained appears in the output log entry as the value of the agent.googleapis.com/log_file_path label. When using a wildcard, only the path of the file from which the record was obtained is recorded.
type The value must be tomcat_system.
wildcard_refresh_interval 60s The interval at which wildcard file paths in include_paths are refreshed. Given as a time duration parsable by time.ParseDuration, for example 30s or 2m. This property might be useful under high logging throughputs where log files are rotated faster than the default interval.

To configure a receiver for your tomcat_access logs, specify the following fields:

Field Default Description
exclude_paths A list of filesystem path patterns to exclude from the set matched by include_paths.
include_paths [/opt/tomcat/logs/localhost_access_log.*.txt] A list of filesystem paths to read by tailing each file. A wild card (*) can be used in the paths.
record_log_file_path false If set to true, then the path to the specific file from which the log record was obtained appears in the output log entry as the value of the agent.googleapis.com/log_file_path label. When using a wildcard, only the path of the file from which the record was obtained is recorded.
type The value must be tomcat_access.
wildcard_refresh_interval 60s The interval at which wildcard file paths in include_paths are refreshed. Given as a time duration parsable by time.ParseDuration, for example 30s or 2m. This property might be useful under high logging throughputs where log files are rotated faster than the default interval.

What is logged

The logName is derived from the receiver IDs specified in the configuration. Detailed fields inside the LogEntry are as follows.

The tomcat_system logs contain the following fields in the LogEntry:

Field Type Description
jsonPayload.level string Log entry level
jsonPayload.message string Log message, including detailed stacktrace where provided
jsonPayload.module string Module of tomcat where the log originated
jsonPayload.source string Source of where the log originated
severity string (LogSeverity) Log entry level (translated).

The tomcat_access logs contain the following fields in the LogEntry:

Field Type Description
httpRequest object See HttpRequest
jsonPayload.host string Contents of the Host header
jsonPayload.user string Authenticated username for the request
severity string (LogSeverity) Log entry level (translated).

Configure metrics collection

To ingest metrics from Tomcat, you must create receivers for the metrics that Tomcat produces and then create a pipeline for the new receivers.

To configure a receiver for your tomcat metrics, specify the following fields:

Field Default Description
collect_jvm_metrics true Configures the receiver to also collect the supported JVM metrics.
collection_interval 60s A time duration, such as 30s or 5m.
endpoint localhost:8050 The JMX Service URL or host and port used to construct the service URL. This value must be in the form of service:jmx:<protocol>:<sap> or host:port. Values in host:port form are used to create a service URL of service:jmx:rmi:///jndi/rmi://<host>:<port>/jmxrmi.
password The configured password if JMX is configured to require authentication.
type This value must be tomcat.
username The configured username if JMX is configured to require authentication.

What is monitored

The following table provides the list of metrics that the Ops Agent collects from the Tomcat instance.

Metric type 
Kind, Type
Monitored resources
Labels
workload.googleapis.com/tomcat.errors
CUMULATIVEINT64
gce_instance
proto_handler
workload.googleapis.com/tomcat.max_time
GAUGEINT64
gce_instance
proto_handler
workload.googleapis.com/tomcat.processing_time
CUMULATIVEINT64
gce_instance
proto_handler
workload.googleapis.com/tomcat.request_count
CUMULATIVEINT64
gce_instance
proto_handler
workload.googleapis.com/tomcat.sessions
GAUGEDOUBLE
gce_instance
 
workload.googleapis.com/tomcat.threads
GAUGEINT64
gce_instance
proto_handler
state
workload.googleapis.com/tomcat.traffic
CUMULATIVEINT64
gce_instance
direction
proto_handler

Sample dashboard

To view your Tomcat metrics, you must have a chart or dashboard configured. Cloud Monitoring provides a library of sample dashboards for integrations, which contain preconfigured charts. For information about installing these dashboards, see Installing sample dashboards.

Verify the configuration

This section describes how to verify that you correctly configured the Tomcat receiver. It might take one or two minutes for the Ops Agent to begin collecting telemetry.

To verify that the logs are ingested, go to the Logs Explorer and run the following query to view the Tomcat logs:

resource.type="gce_instance"
(log_id("tomcat_system") OR log_id("tomcat_access"))

To verify that the metrics are ingested, go to Metrics Explorer and run the following query in the MQL tab:

fetch gce_instance
| metric 'workload.googleapis.com/tomcat.threads'
| every 1m

What's next

For a walkthrough on how to use Ansible to install the Ops Agent, configure a third-party application, and install a sample dashboard, see the Install the Ops Agent to troubleshoot third-party applications video.