============
Webservers
============

=> Server is a software which is used to run web applications.

=> Users can access our web application by sending request to server

=> Users will use client s/w to send request to server

		Ex: Browser

=> Server is responsible to handle user requests & response

=> We have several servers in the market to run our web applications

		1) Tomcat
		2) JBoss
		3) Glassfish
		4) Weblogic
		5) WebSphere
		6) IIS etc..

Note: To run web application, server is mandatory.

=> The process of executing web application by using server is called as Deployment.

		Build => Compile + Test + Package

		Deployment => Execution

==============
Tomcat Server
==============

=> Tomcat is free & open source s/w

=> Tomcat is a web server developed by Apache Organization	

=> Tomcat server developed using Java language

Note: To run tomcat server, java should be installed.

=> Tomcat server is used to run Java Web Applications

=> Tomcat supports multiple operating systems

=> Tomcat server runs on 8080 port number (we can change it)

=======================
Tomcat Setup In Linux
=======================

=> Create Linux VM using Amazon Linux AMI in AWS Cloud

=> Connect to Linux VM using mobaxterm / Putty/ Git Bash

=> Install maven software

	$ sudo yum install maven

Note: When we install maven, java s/w also gets installed automatically.

=> We can download tomcat software from its offical website

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

=> Download tomcat server tar file

	$ wget https://dlcdn.apache.org/tomcat/tomcat-9/v9.0.89/bin/apache-tomcat-9.0.89.tar.gz	

=> Extract tar file

	$ tar -xvf <tar-file-name>	

	$ cd <tomcat-dir-name>

	$ ls -l

===================================
Tomcat Server directory structure
===================================

1) bin : It contains files to start & stop server  (windows : bat , Linux : sh)

			windows: startup.bat & shutdown.bat
		 	Linux : statup.sh & shutdown.sh

2) conf : It contains tomcat server configuration files

		Ex: server.xml, tomcat-users.xml etc...

3) webapps : It is called as deployment folder. We will keep war files here.

4) logs : Server log messages will be stored here

5) lib : It contains libraries required for server (jars)

6) temp :  Temporary files will be created here (We can delete them)


============================
Web app deployment process
============================

=> Create Maven web application in ec2-user home directory

$ mvn archetype:generate -DgroupId=in.ashokit -DartifactId=my-web-app -DarchetypeArtifactId=maven-archetype-webapp -DarchetypeVersion=1.4 -DinteractiveMode=false

=> Package maven project as war file using 'mvn clean package' goal

=> Copy project war file into tomcat server webapps folder	

	$ cp <app/target/warfile> <tomcat/webapps>

=> Start Tomcat server using below command (it is present in tomcat/bin directory)

	$ sh startup.sh

Note: Enable Tomcat server port number 8080 in Ec2 VM Security Group Inbound Rules.

=> Access our web application using browser

	URL : http://ec2-public-ip:8080/my-web-app


====================================
Enable Tomcat Admin Console Access
====================================	

=> By default the Host Manager is only accessible from a browser running on the same machine as Tomcat. If you wish to modify this restriction, you'll need to edit the Host Manager's context.xml file.

=> File Location : <tomcat-folder>/webapps/manager/META-INF/context.xml

=> In Manager context.xml file, change <Valve> section like below (allow attribute value changed)

<Context antiResourceLocking="false" privileged="true" >
     <Valve className="org.apache.catalina.valves.RemoteAddrValve" allow=".*" />
</Context>

============================================================================
Add tomact users in "<tomact>/conf/tomact-users.xml" file like below 
============================================================================

<role rolename="manager-gui" />
<role rolename="manager-script" />
<role rolename="admin-gui" />

<user username="tomcat" password="tomcat" roles="manager-gui" />
<user username="admin" password="admin" roles="manager-gui,admin-gui,manager-script"/>


=> Once above changes completed, then start tomcat server and access tomcat admin console in browser.

		URL : http://public-ip:8080/

Note: Then click on 'Manager App' and login with credentials to perform deploy & undeploy.

===========================================
How to change tomcat server port number ?
==========================================

=> Tomcat server default port is 8080

=> We can change this port number using server.xml file

	File location : tomcat-dir/conf/server.xml

=> After changing the port number stop and start tomcat server

=> Enable new port number in EC2 VM Security Group inbound rules.

		Server URL : http://public-ip:port-num/	

===================
Tomcat - Summary	
===================

1) What is Server
2) What is Tomcat
3) Tomcat Setup
4) Tomcat Directory structure
5) war file deployment
6) Tomcat Admin Console
7) Port Number change