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---
id: tomcat
title: Monitor：Apache Tomcat
sidebar_label: Apache Tomcat
keywords: [open source monitoring tool, open source tomcat monitoring tool, monitoring tomcat metrics]
---
> Collect and monitor the general performance Metrics of Apache Tomcat.
**Protocol Use：JMX**
## Configuration parameter
| Parameter name | Parameter help description |
|---------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Monitoring Host | Monitored IPV4, IPV6 or domain name. Note⚠️Without protocol header (eg: https://, http://) |
| Monitoring name | Identify the name of this monitoring. The name needs to be unique |
| Port | Port provided by JMX |
| Username | JMX connection user name, optional |
| Password | JMX connection password, optional |
| Collection interval | Interval time of monitor periodic data collection, unit: second, and the minimum interval that can be set is 30 seconds |
| Whether to detect | Whether to detect and check the availability of monitoring before adding monitoring. Adding and modifying operations will continue only after the detection is successful |
| Description remarks | For more information about identifying and describing this monitoring, users can note information here |
### Collection Metrics
#### Metrics Set：memory_pool
| Metric name | Metric unit | Metric help description |
|-------------|-------------|-------------------------|
| name | | metrics name |
| committed | kb | total size |
| init | kb | init size |
| max | kb | max size |
| used | kb | used size |
#### Metrics Set：code_cache
| Metric name | Metric unit | Metric help description |
|-------------|-------------|-------------------------|
| committed | kb | total size |
| init | kb | init size |
| max | kb | max size |
| used | kb | used size |
#### Metrics Set：class_loading
| Metric name | Metric unit | Metric help description |
|-----------------------|-------------|--------------------------|
| LoadedClassCount | | Loaded Class Count |
| TotalLoadedClassCount | | Total Loaded Class Count |
| UnloadedClassCount | | Unloaded Class Count |
#### Metrics Set：thread
| Metric name | Metric unit | Metric help description |
|-------------------------|-------------|----------------------------|
| TotalStartedThreadCount | | Total Started Thread Count |
| ThreadCount | | Thread Count |
| PeakThreadCount | | Peak Thread Count |
| DaemonThreadCount | | Daemon Thread Count |
| CurrentThreadUserTime | ms | Current Thread User Time |
| CurrentThreadCpuTime | ms | Current Thread Cpu Time |
### Tomcat Enable JMX Protocol
1. After building tomcat, enter the bin directory under tomcat and modify the catalina.sh file
2. vim catalina.sh Attention⚠️ Replace Hostname And Port
```aidl
CATALINA_OPTS="$CATALINA_OPTS -Dcom.sun.management.jmxremote -Djava.rmi.server.hostname=10.1.1.52 -Dcom.sun.management.jmxremote.port=1099 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false"
```