Tomcat on CentOS

Installation and Configuration on CentOS

Requirement

Open a terminal and switch to root user.

su - yum install -y java-1.8.0 wget java -version

Create Tomcat Service Account

groupadd tomcat useradd -g tomcat -d /opt/tomcat -s /bin/nologin tomcat

Download & Setup Apache Tomcat

wget http://www-us.apache.org/dist/tomcat/tomcat-8/v8.5.20/bin/apache-tomcat-8.5.20.tar.gz tar -zxvf apache-tomcat-*.tar.gz mv apache-tomcat-8.5.20/* /opt/tomcat/ chown -R tomcat:tomcat /opt/tomcat/

Set Environment Variables

mkdir /opt/tomcat/bin/setenv.sh chmod 777 /opt/tomcat/bin/setenv.sh

Example:

export variableName=value ...

Systemd

vi /etc/systemd/system/tomcat.service

Add below information to Tomcat systemd service file.

[Unit] Description=Apache Tomcat 8.x Web Application Container Wants=network.target After=network.target [Service] Type=forking Environment=JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.141-1.b16.el7_3.x86_64/jre Environment=CATALINA_PID=/opt/tomcat/temp/tomcat.pid Environment=CATALINA_HOME=/opt/tomcat Environment='CATALINA_OPTS=-Xms512M -Xmx1G -Djava.net.preferIPv4Stack=true' Environment='JAVA_OPTS=-Djava.awt.headless=true' ExecStart=/opt/tomcat/bin/startup.sh ExecStop=/opt/tomcat/bin/shutdown.sh SuccessExitStatus=143 User=tomcat Group=tomcat UMask=0007 RestartSec=10 Restart=always [Install] WantedBy=multi-user.target

Reload systemd daemon.

systemctl daemon-reload systemctl start tomcat systemctl status tomcat systemctl enable tomcat //Enable the auto start of Tomcat service on system start

Verify Apache Tomcat

By default, Tomcat runs on port no 8080. Use netstat command to check whether the service is listening on port 8080 or not.

netstat -antup | grep 8080

Output:

tcp6 0 0 :::8080 :::* LISTEN 2428/java

Firewall

You may need to allow port 8080 in the firewall so that we can access Tomcat from external networks.

firewall-cmd --permanent --add-port=8080/tcp firewall-cmd --reload