Apache Tomcat is an open source web server and servlet container developed by the Apache Software Foundation. It implements the Java Servlet, JavaServer Pages (JSP), Java Unified Expression Language and Java WebSocket specifications from Sun Microsystems and provides a web server environment for Java code to run in.
This article will guide you through the installation of Tomcat 8 on CentOS 7. Tomcat 8.0.9 is the first stable version of the 8th generation lunched on 25-06-2014, it’s aligned with Java EE 7. In addition to supporting updated versions of the Java EE specifications, Tomcat 8 includes a number of improvements compared to Tomcat 7 like support for Java Servlet 3.1, JavaServer Pages 2.3, Java Unified Expression Language 3.0 and Java WebSocket 1.0.
So let’s begin with the installation process:
1. Check if the correct version of Java is installed
JAVA is required for Tomcat to work, CentOS 7 comes with JAVA 7 witch is the needed version. To check if it is installed run:
# java -version java version "1.7.0_55" OpenJDK Runtime Environment (rhel-220.127.116.11.el7_0-x86_64 u55-b13) OpenJDK 64-Bit Server VM (build 24.51-b03, mixed mode)
In case java is not installed on your system or you have version 1.6.x, you can install it by running:
# yum install java-1.7.0-openjdk.x86_64 java-1.7.0-openjdk-devel
2. Download Tomcat
You can find the latest version of Tomcat at its download page. You can download it with wget and extract it with tar like this:
# cd /usr/share # wget http://archive.apache.org/dist/tomcat/tomcat-8/v8.0.9/bin/apache-tomcat-8.0.9.tar.gz # tar zxvf apache-tomcat-8.0.9.tar.gz
3. Add tomcat user & group
As it is not recommended to run Tomcat as root we will need to create an unprivileged user for it and set the apropiate owner of the tomcat folder:
# groupadd tomcat # useradd -g tomcat -s /bin/bash -d /usr/share/apache-tomcat-8.0.9 tomcat # chown -Rf tomcat.tomcat /usr/share/apache-tomcat-8.0.9/
4. Running Tomcat
To start tomcat we will first need to switch to the unprivileged user with:
# su – tomcat
And starting tomcat is as easy as running its startup script like this:
$ cd bin $ ./startup.sh
The output should look like:
Using CATALINA_BASE: /usr/share/apache-tomcat-8.0.9 Using CATALINA_HOME: /usr/share/apache-tomcat-8.0.9 Using CATALINA_TMPDIR: /usr/share/apache-tomcat-8.0.9/temp Using JRE_HOME: / Using CLASSPATH: /usr/share/apache-tomcat-8.0.9/bin/bootstrap.jar:/usr/share/apache-tomcat-8.0.9/bin/tomcat-juli.jar Tomcat started.
You should now be able to access it with a browser by either accessing http://localhost:8080 if this is a local computer or http://SERVER-IP:8080 if you are running it on a remote host.
To shutdown Tomcat you can simply run the shutdown script in the same folder like this:
5. Setup user accounts
Finally you have to configure Tomcat users so they can access admin/manager sections. You can do this by adding the users in the conf/tomcat-users.xml file with your favorite text editor. Add this text to the file:
<user username="manager" password="PASSWORD" roles="manager-gui" /> <user username="admin" password="PASSWORD" roles="manager-gui,admin-gui" />
6. Running Multiple Instances of Tomcat (Optional)
Sometimes you need to run more than one instance of Tomcat on the same server. To do this, as root, go back to the /usr/share directory where you first downloaded tomcat and extract it again in a different folder like this:
# cd /usr/share # mkdir apache-tomcat-2 # tar zxvf apache-tomcat-8.0.9.tar.gz -C apache-tomcat-2 --strip-components 1 # chown -Rf tomcat.tomcat /usr/share/apache-tomcat-2/
Now we need to open the config/server.xml file in the new installation folder and change the port numbers like this:
The shutdown port from:
<Server port="8005" shutdown="SHUTDOWN">
<Server port="8006" shutdown="SHUTDOWN">
The connector port from:
<Connector port="8080" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8443" />
<Connector port="8081" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8443" />
And the AJP port from:
<Connector port="8009" protocol="AJP/1.3" redirectPort="8443" />
<Connector port="8010" protocol="AJP/1.3" redirectPort="8443" />
Now you can just switch back to the tomcat user and start the second instance like this:
# su - tomcat $ cd /usr/share/apache-tomcat-2/bin/ $ ./startup.sh Using CATALINA_BASE: /usr/share/apache-tomcat-2 Using CATALINA_HOME: /usr/share/apache-tomcat-2 Using CATALINA_TMPDIR: /usr/share/apache-tomcat-2/temp Using JRE_HOME: / Using CLASSPATH: /usr/share/apache-tomcat-2/bin/bootstrap.jar:/usr/share/apache-tomcat-2/bin/tomcat-juli.jar Tomcat started.
You can now access the new instance of tomcat with your browser at http://localhost:8081/
Congratulation you now have Tomcat installed and ready to use!