How to Install Tomcat
Tomcat is web server and servlet container which is used to run java applications, i will be showing the steps to install tomcat and java in an production system. i will be installing Tomcat 9 and OpenJDK 1.8 (Java 8). Most Steps are common for Redhat and Debian based systems.
Java 8 Installation
For Redhat based Distribution
yum install java-1.8.0-openjdk.x86_64 java-1.8.0-openjdk-devel.x86_64
For Debian and Ubuntu based Distribution
sudo apt install openjdk-8-jdk
Get the Java Installed Version
java -version
openjdk version "1.8.0_181"
OpenJDK Runtime Environment (build 1.8.0_181-b13)
OpenJDK 64-Bit Server VM (build 25.181-b13, mixed mode)
We need to set JAVA_HOME environment variable so run and get the JAVA_HOME Path
sudo update-alternatives --config java
Edit file vim /etc/environment add JAVA_HOME environment variable
JAVA_HOME="/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.111-1.b15.el7_2.x86_64/jre"
Logout and Login, run env, Check for JAVA_HOME in the output.
Tomcat 9 Installation
Create a tomcat group
groupadd tomcat
Create a tomcat user with /opt/tomcat as its home directory
mkdir -p /opt/tomcat
useradd -s /bin/false -g tomcat -d /opt/tomcat tomcat
Change working directory and download the latest tomcat from tomcat website
cd /opt
wget http://mirrors.wuchna.com/apachemirror/tomcat/tomcat-9/v9.0.12/bin/apache-tomcat-9.0.12.tar.gz
Extract the Tomcat archive
tar -xzvf apache-tomcat-9.0.12.tar.gz
Move Contents to /opt/tomcat
mv apache-tomcat/* /opt/tomcat
Change ownership and user to tomcat
chown -R tomcat:tomcat /opt/tomcat
Create Systemd Service for Tomcat Service
vim /etc/systemd/system/tomcat.service
Reload systemd manager configuration.
systemctl daemon-reload
Start Tomcat Process.
systemctl start tomcat
Enable Tomcat to Start at System Boot.
systemctl enable tomcat
Run netstat -plntu and check port 8080 is in LISTEN State by a java program. Now open http://server-ip-addres:8080 you should see tomcat homepage
Configure Tomcat Manager Users
Restart Tomcat Process.
systemctl restart tomcat
Make sure all the Files in /opt/tomcat belong to Tomcat user and group, Run this Command whenever you new deploy WAR in /opt/tomcat/webapps
chown -R tomcat:tomcat /opt/tomcat