Introduction of Tomcat
- 2. WHAT IS APPLICATION SERVER • An application server is a type of server designed to install, operate and host applications and associated services for end users, IT services and organizations. • It facilitates the hosting and delivery of high-end consumer or business applications, which are used by multiple and simultaneously connected local or remote users.
- 3. WHY USE AN APPLICATION SERVER? WHAT ARE THE BENEFITS? • Application servers are best used when there is the need to integrate with databases and servers, for example, web servers, which have already been set up and are part of an organisation's existing IT infrastructure. BENEFITS: • One of the predominant reasons for this is that an application server can serve as a means to provide integrity to code and data by having an integrated and centralized approach to keeping applications upgraded and updated.
- 4. CONT… • Another core reason to put an application server to use it that it provides your organization with an additional layer of security. By sitting in between web pages and databases, an application server helps act as an additional barrier to SQL injection cyber attacks, as there is no direct link between a web page and a database. This separation carries the need for validation and/or a requirement to show business logic, thereby ensuring that text entered into a form on a website is not being exploited as a malicious SQL call.
- 7. APACHE TOMCAT • The Apache Tomcat software is an open source implementation of the Java Servlet, JavaServer Pages, Java Expression Language and Java WebSocket technologies.
- 8. APACHE TOMCAT COMPONENTS • Catalina • Coyote • Jasper • Cluster • High Availability • Web Application
- 9. JASPER 2 • Jasper is the JSP Engine for Tomcat. Jasper is responsible for parsing JSP files and compilation of JSP’s Java code as servlets. • Jasper is capable of background compilation, which means if any changes are made to JSP files, then the older versions of those JSP files are still retained by the server, until the updated JSP files are recompiled
- 10. CATALINA • Catalina is Tomcat’s servlet container. Catalina makes Tomcat a Web Server for dynamic content.
- 11. COYOTE • Coyote is the component that makes Tomcat capable as a HTTP Web Server. Coyote makes Catalina also act as a server that serves static content.
- 12. INSTALLATION OF TOMCAT • Pre-requisites EC2 instance with Java v1.8.x Install Apache Tomcat • Download tomcat packages from https://tomcat.apache.org/download-80.cgi onto /opt on EC2 instance # Create tomcat directory • cd /opt • Download from Internet “apache-tomcat-8.5.57.tar.gz” • tar -xvzf /opt/apache-tomcat-8.5.57.tar.gz • give executing permissions to startup.sh and shutdown.sh which are under bin. • chmod +x /opt/apache-tomcat-8.5.35/bin/startup.sh shutdown.sh • Run ./startup.sh
- 13. CHECK POINT • Access tomcat application from browser on port 8080 • http://<Public_IP>:8080 • Using unique ports for each application is a best practice in an environment. But tomcat and Jenkins runs on ports number 8080. Hence lets change tomcat port number to 8090. • Change port number in conf/server.xml file under tomcat home cd /opt/apache-tomcat-8.5.35/conf • # update port number in the "connecter port" field in server.xml • # restart tomcat after configuration update • ./shutdown.sh • ./startup.sh