Install and configure Tomcat version 9 on your Linux machine with the Manager and Host Manager sections enabled. Also Changing port from 8080 to 9050.

Ans: Here is the step by step installation process of tomcat 9: 

 
Launch an Linux EC2 instance with the port 22, 80, 8080, 9050. Connect it via any SSH client such PuTTY or MobaXterm or Command prompt terminal or Git Bash or VS code.

After connecting to SSH, paste the following commands and follow the instructions mentioned below.

-> sudo yum install java-17-openjdk-devel -y                       

[ Not working? Click here ]

#If you were using Redhat and if you get error about redhat server subscription, then you can either sign in to Redhat server and subscribe and use the same in ssh. Or else you can manually download Java Jdk and install it using below commands:

sudo yum update -y
sudo yum install wget -y
sudo mkdir /opt/java-17
wget https://download.java.net/java/GA/jdk17/0d483333a00540d886896bac774ff48b/35/GPL/openjdk-17_linux-x64_bin.tar.gz
sudo tar xf openjdk-17_linux-x64_bin.tar.gz -C /opt/java-17/ --strip-components=1
export JAVA_HOME=/opt/java-17
export PATH=$JAVA_HOME/bin:$PATH
java --version

Note: If you're using amazon Linux or cent OS, then java command might change, please check it online and java home path in tomcat.service file may also change. Instead you can just install it manually by clicking on above link 

[Click here]

#If you were using Redhat and if you get error about redhat server subscription, then you can either sign in to Redhat server and subscribe and use the same in ssh. Or else you can manually download Java Jdk and install it using below commands:

sudo yum update -y
sudo yum install wget -y
sudo mkdir /opt/java-17
wget https://download.java.net/java/GA/jdk17/0d483333a00540d886896bac774ff48b/35/GPL/openjdk-17_linux-x64_bin.tar.gz
sudo tar xf openjdk-17_linux-x64_bin.tar.gz -C /opt/java-17/ --strip-components=1
export JAVA_HOME=/opt/java-17
export PATH=$JAVA_HOME/bin:$PATH
java --version

-> sudo useradd -m -U -d /opt/tomcat -s /bin/false tomcat

-> cd /tmp

-> wget https://dlcdn.apache.org/tomcat/tomcat-9/v9.0.105/bin/apache-tomcat-9.0.105.tar.gz

-> sudo tar xf /tmp/apache-tomcat-9.0.105.tar.gz -C /opt/tomcat --strip-components=1

-> sudo chown -R tomcat: /opt/tomcat

-> sudo chmod -R 755 /opt/tomcat

-> sudo vi /etc/systemd/system/tomcat.service

[Unit]
Description=Apache Tomcat Web Application Container
After=network.target

[Service]
Type=forking

User=tomcat
Group=tomcat

Environment="JAVA_HOME=/opt/java-17"
Environment="CATALINA_PID=/opt/tomcat/temp/tomcat.pid"
Environment="CATALINA_HOME=/opt/tomcat"
Environment="CATALINA_BASE=/opt/tomcat"
Environment="CATALINA_OPTS=-Xms512M -Xmx1024M -server -XX:+UseParallelGC"
Environment="JAVA_OPTS=-Djava.awt.headless=true -Djava.security.egd=file:/dev/./urandom"

ExecStart=/opt/tomcat/bin/startup.sh
ExecStop=/opt/tomcat/bin/shutdown.sh

[Install]
WantedBy=multi-user.target

-> :wq

-> sudo systemctl daemon-reload

-> sudo systemctl start tomcat

-> sudo systemctl enable tomcat


If you have made any changes or shutdown instance, you need to restart tomcat.

-> sudo systemctl restart tomcat

-> sudo systemctl status tomcat - -> to check status of tomcat


Output: Access the Tomcat dashboard using public IP with port 8080:

http://Server_IP:8080/ - -> (do not use https, it won’t work. Use http) (You can run this command to get public IP: curl ifconfig.me)

Enable the manager and host manager:
-> sudo vi /opt/tomcat/conf/tomcat-users.xml

<role rolename="manager-gui"/>
<role rolename="manager-script"/>
<role rolename="manager-jmx"/>
<role rolename="manager-status"/>
<role rolename="admin-gui"/>
<role rolename="admin-script"/>
<user username="admin" password="admin" roles="manager-gui,admin-gui"/>

copy and paste the above lines at the bottom of he file.

-> :wq

Note: (# manager-gui,admin-gui - Roles assigned to the user, allowing access to both Manager and Host Manager interfaces )
(#you can change the password from "admin" to anything of your choice.)

-> sudo vi /opt/tomcat/webapps/manager/META-INF/context.xml

# comment on the Valve className …. line.
i.e., Before commenting the code, it looks like:

<Context antiResourceLocking="false" privileged="true" >

<CookieProcessor className="org.apache.tomcat.util.http.Rfc6265CookieProcessor"

sameSiteCookies="strict" />

<Valve className="org.apache.catalina.valves.RemoteAddrValve"

allow="\127\.d+\.\d+\.\d+|::1|0:0:0:0:0:0:0:1" />

<Manager sessionAttributeValueClassNameFilter="java\.lang\.(?:Boolean|Integer|Long|Number|String)|org\.apache\.catalina\.filters\.CsrfPreventionFilter\$LruCache(?:\$1)?|java\.util\.(?:Linked)?HashMap"/>

</Context>

After:

<Context antiResourceLocking="false" privileged="true" >

<CookieProcessor className="org.apache.tomcat.util.http.Rfc6265CookieProcessor"

sameSiteCookies="strict" />

<!-- <Valve className="org.apache.catalina.valves.RemoteAddrValve"

allow="\127\.d+\.\d+\.\d+|::1|0:0:0:0:0:0:0:1" />

-->

<Manager sessionAttributeValueClassNameFilter="java\.lang\.(?:Boolean|Integer|Long|Number|String)|org\.apache\.catalina\.filters\.CsrfPreventionFilter\$LruCache(?:\$1)?|java\.util\.(?:Linked)?HashMap"/>

</Context>

-> :wq
-> sudo vi /opt/tomcat/webapps/host-manager/META-INF/context.xml

Repeat the previous step for host-manager:
After:

<Context antiResourceLocking="false" privileged="true" >

<CookieProcessor className="org.apache.tomcat.util.http.Rfc6265CookieProcessor"

sameSiteCookies="strict" />

<!-- <Valve className="org.apache.catalina.valves.RemoteAddrValve"
allow="\127\.d+\.\d+\.\d+|::1|0:0:0:0:0:0:0:1" />

allow="\127\.d+\.\d+\.\d+|::1|0:0:0:0:0:0:0:1" />

-->

<Manager sessionAttributeValueClassNameFilter="java\.lang\.(?:Boolean|Integer|Long|Number|String)|org\.apache\.catalina\.filters\.CsrfPreventionFilter\$LruCache(?:\$1)?|java\.util\.(?:Linked)?HashMap"/>

</Context>

-> :wq
-> sudo systemctl restart tomcat


Output: Now you can access http://Server_IP:8080/ and click on manager app and host-manager app button or else use: http://Server_IP:8080/manager/html and http://Server_IP:8080/host-manager/html
Enter user: admin
Password: admin


Screenshot of manager:

Change the default Tomcat port to 9050:

-> sudo vi /opt/tomcat/conf/server.xml

Update the port number as shown in below line:
Before:

<Connector port="8080" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443" />

After:

<Connector port="9050" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443" />

-> :wq
-> sudo systemctl restart tomcat


Output: Access the tomcat using http://Server_IP:9050/

THANK YOU FOR VISITING!