Install tomcat 9 on centos 7

Linux

How to install and configure Tomcat 9 on centos 7

Apache Tomcat is an open-source web server developed by Apache Foundation to provide a pure Java HTTP server, which is useful to run Java files easily.

Tomcat 9 requires Java 8 or later.Before installing Tomcat make sure you must have JAVA installed on your Linux server to run Tomcat.

Apache Tomcat 9 support:

• Java Servlet 4.0
• JavaServer Pages 2.4
• Java Unified Expression Language 3.1
• and Java API for WebSocket 2.0 specifications.

Step1: Installing Java

# yum install java-1.8.0

Once java is installed verify java version by following command.

# java -version

Sample output as below

[root@lampblogs ~]# java -version 
openjdk version "1.8.0_212" 
OpenJDK Runtime Environment (build 1.8.0_212-b04) 
OpenJDK 64-Bit Server VM (build 25.212-b04, mixed mode)

Step2: Installing Apache Tomcat 9

Download latest version of Apache tomcat (ie 9.0.21) is most Recent version at the time of writing this article.you can download from following url if there is lastet version available.

https://tomcat.apache.org/download-90.cgi

# cd /opt 
# wget http://mirrors.estointernet.in/apache/tomcat/tomcat-9/v9.0.21/bin/apache-tomcat-9.0.21.tar.gz 
# tar -xvzf apache-tomcat-9.0.21.tar.gz 
# mv apache-tomcat-9.0.21 tomcat9

step 3: create Tomact user and group and set permissions

groupadd tomcat 
useradd -s /bin/false -g tomcat -d /opt/tomcat tomcat 
chown tomcat:tomcat -R /opt/tomcat/ 
chmod +x /opt/tomcat/bin/*

step 4: Set Environment Variables

Now configure the CATALINA_HOME environment variable in your system using the following commands. Its required to run the Tomcat server.

# echo "export CATALINA_HOME="/opt/tomcat"" >> ~/.bashrc 
# source ~/.bashrc

you will get command output as below.

[root@lampblogs ~]# echo $CATALINA_HOME 
/opt/tomcat

step 5: setup user accounts

we need to create user accounts to secure and access admin/manager

By default no user or account is allowed to access Manager GUI Page and Admin Page. So to grant access to the users add the following lines.

vim /opt/tomcat/conf/tomcat-users.xml

<!-- User lampblogs who can access only manager section -->
<role rolename="manager-gui" />
<user username="lampblogs" password="<Enter-Secure-Password>" roles="manager-gui" />
<!-- User Admin Who can access manager and admin section both -->
<role rolename="admin-gui" />
<user username="admin" password="<Enter-Secure-Password>" roles="admin-gui" />

Replace secure-Password with your strong password.

step 6: start and stop tomcat service

[root@lampblogs ~]# cd /opt/tomcat/bin/ 
[root@lampblogs bin]# ./startup.sh 
Using CATALINA_BASE: /opt/tomcat 
Using CATALINA_HOME: /opt/tomcat 
Using CATALINA_TMPDIR: /opt/tomcat/temp Using JRE_HOME: /usr 
Using CLASSPATH: /opt/tomcat/bin/bootstrap.jar:/opt/tomcat/bin/tomcat-juli.jar 
Tomcat started.

To shutdown service use below command.

[root@lampblogs bin]# ./shutdown.sh

step 7: configure Apache tomcat as a service

vim /etc/systemd/system/apache-tomcat.service

[Unit] 
Description=Apache Tomcat 9 Servlet Container 
After=syslog.target network.target [Service] 
User=tomcat 
Group=tomcat 
Type=forking 
Environment=CATALINA_PID=/opt/tomcat/tomcat.pid 
Environment=CATALINA_HOME=/opt/tomcat 
Environment=CATALINA_BASE=/opt/tomcat 
ExecStart=/opt/tomcat/bin/startup.sh 
ExecStop=/opt/tomcat/bin/shutdown.sh 
Restart=on-failure 
[Install] WantedBy=multi-user.target

Now reload systemd service and start using systemctl

# systemctl daemon-reload 
# systemctl start apache-tomcat 
# systemctl enable apache-tomcat

step 8: open tomcat port in firewall

[root@lampblogs ~]# firewall-cmd --permanent --zone=public --add-port=8080/tcp
 success 
[root@lampblogs ~]# firewall-cmd --reload
 success

Open your web browser and type your server IP with port 8080. you will see  Tomcat home page.

http://ip_address:8080