How to enable Apache Tomcat monitoring in Datadog Agent?

Apache Tomcat Integratoion with Datadog collects Following Tomcat metrics

• Overall activity metrics: error count, request count, processing times, etc.
• Thread pool metrics: thread count, number of threads busy, etc.
• Servlet processing times

Step 1 – How to Install Open JDK 11

## Centos
$ sudo yum install java-11-openjdk-devel

## Ubunutu
$ sudo apt-get update
$ sudo apt-get install openjdk-11-jdk -y
$ apt install openjdk-11-jdk-headless -y 

Reference

• https://openjdk.java.net/install/
• https://www.devopsschool.com/blog/complete-guide-of-java-installation-in-linux/

How to Download Apache Tomcat 9?

# RHEL/CENTOS
$ sudo yum install wget unzip -y

# Ubuntu
$ sudo apt-get install wget unzip -y

$ sudo -s
$ cd /opt/
$ wget https://dlcdn.apache.org/tomcat/tomcat-9/v9.0.73/bin/apache-tomcat-9.0.73.zip
$ unzip apache-tomcat-9.0.73.zip
$ cd apache-tomcat-9.0.73
$ cd bin
$ chmod -R 755 .
$ ls

$ ./shutdown.sh
$ ./startup.sh

Reference

• https://tomcat.apache.org/download-80.cgi

How to install datadog agent in centos 7?

How to enable JMX Remote in Tomcat 8 to Monitor & Administer?

$ vi /opt/apache-tomcat-9.0.73/bin/catalina.sh

CATALINA_OPTS="-Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=9012 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false"

$ ./shutdown.sh
$ ./startup.sh

FOR WINDOWS setenv.bat
--------------------------
set "JAVA_OPTS=%JAVA_OPTS% %JSSE_OPTS% -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=9012 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false"

Reference

• https://tomcat.apache.org/tomcat-8.0-doc/monitoring.html#Enabling_JMX_Remote

How to configure and enable Tomcat intergration in Datadog agent?

$ cd /etc/datadog-agent/conf.d/tomcat.d/
$ cp conf.yaml.example conf.yaml
$ datadog-agent configcheck
$ systemctl restart datadog-agent
$ systemctl status datadog-agent
$ datadog-agent config

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Rajesh Kumar

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