APACHE TOMCAT

APACHE TOMCAT INSTALLATION
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Install Apache Tomcat 9 on centos 7/RHEL 7
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step 1:- Install Java 8 on Centos7.x
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[root@cloudworld ~]# yum install java-1.8.0

Run the beneath command to check Java version :

[root@cloudworld ~]# java -version
openjdk version "1.8.0_101"
OpenJDK Runtime Environment (build 1.8.0_101-b13)
OpenJDK 64-Bit Server VM (build 25.101-b13, mixed mode)
[root@cloudworld ~]#

Step:2 Download the Apache Tomcat 9 tar.gz file
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Downloading Tomcat from the terminal

[root@cloudworld ~]# wget http://www-eu.apache.org/dist/tomcat/tomcat-9/v9.0.0.M9/bin/apache-tomcat-9.0.0.M9.tar.gz

Step:3 Extract the downloaded file and set CATALINA_HOME variable
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Run the beneath tar command to extract Apache tomcat 9 under the /opt folder.

[root@cloudworld ~]# tar -zxpvf apache-tomcat-9.0.0.M9.tar.gz -C /opt/
[root@cloudworld ~]# cd /opt/
[root@cloudworld opt]# mv apache-tomcat-9.0.0.M9/ tomcat

Before starting the Tomcat Service let’’s first set the required CATALINA_HOME environment variable using below commands :

[root@cloudworld ~]# echo "export CATALINA_HOME='/opt/tomcat/'" >> ~/.bashrc
[root@cloudworld ~]# source ~/.bashrc
[root@cloudworld ~]#

Step:4 Specify the Users for Manager GUI Page and Admin Page Access.
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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 in the file “/opt/tomcat/conf/tomcat-users.xml” just above <tomcat-users> tag

<!-- User linuxtechi who can access only manager section -->
<role rolename="manager-gui" />
<user username="linuxtechi" 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" />

Step:5 Start Tomcat Service
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Run the beneath commands one after the another to start tomcat service.

[root@cloudworld ~]# cd /opt/tomcat/bin/
[root@cloudworld bin]# ./startup.sh

To shutdown the tomcat service use below command

[root@cloudworld bin]# ./shutdown.sh
Open the tomcat ports in firewall.

As we know by default tomcat runs on 8080 port so in case firewall is running on your Linux box then set the following rule to open 8080 port on CentOS 7.x and RHEL 7.x.

[root@cloudworld ~]# firewall-cmd --permanent --zone=public --add-port=8080/tcp
success
[root@cloudworld ~]# firewall-cmd --reload
success
[root@cloudworld ~]#
Use the below command to open 8080 port in Ubuntu 16.04 / 16.10 firewall.

root@ubuntu:~# ufw allow 8080
Rule added
Rule added (v6)
root@ubuntu:~#
Note: You can skip this step if firewall is disabled on your server.

Step:6 Access Apache Tomcat 9 page from the Web Browser
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Open the web broswer type the following URL :

http://{ip-address-or-Hostname}:8080

In my case ip address of my server is “192.168.43.9”

Apache-Tomcat-9-Page-CentOS7-RHEL7

Click on “Manager App” , It will prompt us for the User name and password, specify the user’s credentials whatever we set in the file ‘tomcat-users.xml‘

Apache-Tomcat-9-Manager-App-Credentials

Similarly We can view the Server Status by clicking on the option “Server Status”

Scenario : if you have installed Tomcat on remote server and want to access ‘Manger App’ and ‘Server Status’ on your local system’s web browser for that we need to create a file “manager.xml” under the folder “/opt/tomcat/conf/Catalina/localhost/” with the following content.

root@cloudworld ~]# cd /opt/tomcat/conf/Catalina/localhost/
[root@cloudworld localhost]# vi manager.xml
<Context privileged="true" antiResourceLocking="false"
  docBase="${catalina.home}/webapps/manager">
<Valve className="org.apache.catalina.valves.RemoteAddrValve" allow="^.*$" />
</Context>
Save and Exit the file