1. Tomcat-project

Install Apache-TOMCAT

sudo apt update 
sudo apt install openjdk-11-jdk
java -version

• get latest tar.gz from tomcat

wget https://dlcdn.apache.org/tomcat/tomcat-10/v10.1.28/bin/apache-tomcat-10.1.28.tar.gz        

sudo mkdir -p /opt/tomcat
sudo tar xzvf apache-tomcat-*tar.gz -C /opt/tomcat --strip-components=1

Create A Dedicated User

sudo groupadd tomcat
sudo useradd -s /bin/false -g tomcat -d /opt/tomcat tomcat

User Permissions

sudo chown -R tomcat: /opt/tomcat
sudo sh -c 'chmod +x /opt/tomcat/bin/*.sh'

Create A Systemd Service File For TOMCAT

* Check Java version

sudo update-alternatives --config java

/usr/lib/jvm/java-11-openjdk-amd64/bin/java*

* Tomcat.service file

sudo nano /etc/systemd/system/tomcat.service

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

[Service]
Type=forking

User=tomcat
Group=tomcat

# Restart settings
RestartSec=10
Restart=always

# Environment variables
Environment="JAVA_HOME=/usr/lib/jvm/java-11-openjdk-amd64"
Environment="JAVA_OPTS=-Djava.awt.headless=true -Djava.security.egd=file:/dev/./urandom"

Environment="CATALINA_BASE=/opt/tomcat"
Environment="CATALINA_HOME=/opt/tomcat"
Environment="CATALINA_PID=/opt/tomcat/temp/tomcat.pid"
Environment="CATALINA_OPTS=-Xms512M -Xmx1024M -server -XX:+UseParallelGC"

# Use catalina.sh for starting and stopping Tomcat
ExecStart=/opt/tomcat/bin/catalina.sh start
ExecStop=/opt/tomcat/bin/catalina.sh stop

[Install]
WantedBy=multi-user.target

sudo systemctl daemon-reload
sudo systemctl start tomcat
sudo systemctl enable tomcat
sudo systemctl status tomcat

Add Roles and Admin Username and Password

sudo nano /opt/tomcat/conf/tomcat-users.xml

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

Enable TOMCAT and Host Manager Remote Access

• Deployment error so we have to commit these two lines

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

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

sudo nano /opt/tomcat/webapps/host-manager/META-INF/context.xml

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

• Comment this line

sudo systemctl restart tomcat

Change TOMCAT Port

sudo su 
cd /opt/tomcat/conf
sudo nano server.xml

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2. JENKINS

• Java install

sudo apt update
sudo apt install openjdk-17-jre  (For Jenkins)
java -version

• Jenkins install

curl -fsSL https://pkg.jenkins.io/debian/jenkins.io-2023.key | sudo tee \
/usr/share/keyrings/jenkins-keyring.asc > /dev/null

echo deb [signed-by=/usr/share/keyrings/jenkins-keyring.asc] \
https://pkg.jenkins.io/debian binary/ | sudo tee \
/etc/apt/sources.list.d/jenkins.list > /dev/null

sudo apt update
sudo apt-get install jenkins -y
sudo systemctl enable jenkins
sudo systemctl start jenkins
sudo systemctl status jenkins

• Firewall Enable

firewall-cmd —zone=public --permanent —add-port=8080/tcp firewall-cmd --reload

Skip this step

Change Jenkins Port

sudo nano /etc/sysconfig/jenkins

look for port 8080 and change to 8081

cat /etc/sysconfig/jenkins |grep JENKINS_PO

systemctl restart jenkins
systemctl start jenkins
systemctl status jenkins

Password from Jenkins

Cat /var/lib/jenkins/secrets/initialAdminPassword  

copy the password in this admin and create account

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3. MAVEN

sudo apt install maven
mvn --version

---

Global Tool Configuration

• JDK| JDK-18= /usr/lib/jvm/java-11-openjdk-amd64
• GIT| /bin/git (which git)
• MVN| 3.9.4

Creating Job

Source code management

• GIT| Address for the repo ( from Git)
• Credential ( your git hub credentials)
• Branch| */master

BUILD

Invoke Top-level Maven Targets Maven Version | mvm-394 Goal | Clean install

Post build Action

• WAR/EAR file | **/*.war
• Context path | /
• Container | Tomcat 9.x Remote
• Credentials | deployer | deployer
• Tomcat URL | URL IP with Port 8080