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tomcat8_installation.md

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Installation of Tomcat 8

Installaion JDK 8

[root@tomcat8 ] yum -y install java-1.8.0-openjdk java-1.8.0-openjdk-devel
[root@tomcat8 ] cat > /etc/profile.d/java8.sh <<EOF
export JAVA_HOME=$(dirname $(dirname $(readlink $(readlink $(which javac)))))
export PATH=\$PATH:\$JAVA_HOME/bin
export CLASSPATH=.:\$JAVA_HOME/jre/lib:\$JAVA_HOME/lib:\$JAVA_HOME/lib/tools.jar
EOF
[root@tomcat8 ] source /etc/profile.d/java8.sh

If another version of JDK had been installed, change the default like follows.

[root@tomcat8 ] alternatives --config java
There are 2 programs which provide 'java'.

  Selection    Command
-----------------------------------------------
   1           /usr/java/jdk1.8.0_71/jre/bin/java

# select the latest one
Enter to keep the current selection[+], or type selection number: 1

Create a test program and make sure if it works normally.

[root@tomcat8 ] vi day.java

import java.util.Calendar;

class day {
    public static void main(String[] args) {
        Calendar cal = Calendar.getInstance();
        int year = cal.get(Calendar.YEAR);
        int month = cal.get(Calendar.MONTH) + 1;
        int day = cal.get(Calendar.DATE);
        int hour = cal.get(Calendar.HOUR_OF_DAY);
        int minute = cal.get(Calendar.MINUTE);
        System.out.println(year + "/" + month + "/" + day + " " + hour + ":" + minute);
    }
}

compile and run

[root@tomcat8 ] javac day.java
[root@tomcat8 ] java day
2021/5/08 20:37

Now Time to Installation of Tomcat 8

Download , unzip and move the tomcat 8

[root@tomcat8 ] wget https://archive.apache.org/dist/tomcat/tomcat-8/v8.0.20/bin/apache-tomcat-8.0.20.tar.gz
[root@tomcat8 ] tar zxvf apache-tomcat-8.0.20.tar.gz
[root@tomcat8 ] mv apache-tomcat-8.0.20 /usr/tomcat8

Create user for tomcat and grand permission to /usr/tomcat8

[root@tomcat8 ] useradd -M -d /usr/tomcat8 tomcat8
[root@tomcat8 ] chown -R tomcat8. /usr/tomcat8

Create a Systemd Setting file to start and stop tomcat service with service or systemctl commands.

[root@tomcat8 ] vi /usr/lib/systemd/system/tomcat8.service
# create new
[Unit]
Description=Apache Tomcat 8
After=network.target

[Service]
Type=oneshot
ExecStart=/usr/tomcat8/bin/startup.sh
ExecStop=/usr/tomcat8/bin/shutdown.sh
RemainAfterExit=yes
User=tomcat8
Group=tomcat8

[Install]
WantedBy=multi-user.target

Now Start and enable the tomcat8 systemd service

[root@tomcat8 ] systemctl start tomcat8
[root@tomcat8 ] systemctl enable tomcat8

open the web browers and access website http://(server's hostname or IP address):8080/

Create a test servlet that shows current day and time and make sure if it works normally.

[root@tomcat8 ] mkdir /usr/tomcat8/webapps/ROOT/WEB-INF/classes
[root@tomcat8 ] chown tomcat8. /usr/tomcat8/webapps/ROOT/WEB-INF/classes
[root@tomcat8 ] cd /usr/tomcat8/webapps/ROOT/WEB-INF/classes
[root@tomcat8 ] vi daytime.java
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.Calendar;

public class daytime extends HttpServlet {
    public void doGet(HttpServletRequest request
    ,HttpServletResponse response)

    throws IOException, ServletException{
        response.setContentType("text/html");
        PrintWriter out = response.getWriter();
        Calendar cal = Calendar.getInstance();
        out.println("<html>\n<head>\n<title>DayTime</title>\n</head>\n<body>");
        out.println("<div style=\"font-size: 40px; text-align: center; font-weight: bold\">");
        out.println(cal.get(Calendar.YEAR) + "/" + (cal.get(Calendar.MONTH) + 1) + "/" +
        cal.get(Calendar.DATE) + " " + cal.get(Calendar.HOUR_OF_DAY) + ":" + cal.get(Calendar.MINUTE));
        out.println("</div>\n</body>\n</html>");
    }
}

Configure on tomcat configuration files

[root@tomcat8 ] javac -classpath /usr/tomcat8/lib/servlet-api.jar daytime.java
[root@tomcat8 ] vi /usr/tomcat8/webapps/ROOT/WEB-INF/web.xml
# add follows between <web-app> - </web-app>
  <servlet>
     <servlet-name>daytime</servlet-name>
     <servlet-class>daytime</servlet-class>
  </servlet>
  <servlet-mapping>
     <servlet-name>daytime</servlet-name>
     <url-pattern>/daytime</url-pattern>
  </servlet-mapping>

Access to http://(server's hostname or IP address):8080/daytime to make sure it works normally.

Create Tomcat User

adding following lines to /usr/tomcat8/config/tomcat-users.xml in between <tomcat-users> .... </tomcat-users> tags

[root@tomcat8 ]vi /usr/tomcat8/config/tomcat-users.xml
	<role rolename="manager-gui"/>
	<role rolename="manager-script"/>
	<role rolename="manager-jmx"/>
	<role rolename="manager-status"/>
	<user username="admin" password="admin" roles="manager-gui, manager-script, manager-jmx, manager-status"/>
	<user username="deployer" password="deployer" roles="manager-script"/>
	<user username="tomcat" password="s3cret" roles="manager-gui"/>

In above deployer user will use on jenkins

Restart the tomcat service

[root@tomcat8 ] service tomcat8 stop
[root@tomcat8 ] service tomcat8 start

➡️ Tomcat or DevOps 🏠