📌 Step 1: Update APT
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| # First, always update your APT package list.
sudo apt update
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☕ Step 2: Install Java
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| # Install OpenJDK 11 (Required for Tomcat)
sudo apt install openjdk-11-jdk-headless
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🔥 Step 3: Install Apache Tomcat
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| # Check for Tomcat in the repository
sudo apt-cache search tomcat
# Download and install Tomcat
sudo apt install tomcat9 tomcat9-admin
# Verify Tomcat is running on port 8080
ss -ltn
# Enable Tomcat service to start on boot
sudo systemctl enable tomcat9
# Create a Tomcat user
sudo nano /etc/tomcat9/tomcat-users.xml
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📌 Add the following lines in tomcat-users.xml:
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| <role rolename="manager-gui"/>
<role rolename="admin-gui"/>
<user username="{username}" password="{password}" roles="standard,admin-gui,manager-gui"/>
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| # Restart Tomcat to apply changes
sudo systemctl restart tomcat9
# Alternative way to restart Tomcat
sudo systemctl stop tomcat9 && sudo systemctl start tomcat9
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| # Install Nginx
sudo apt-get install nginx
# Start and enable Nginx service
sudo systemctl stop nginx.service
sudo systemctl start nginx.service
sudo systemctl enable nginx.service
# Configure Nginx proxy settings
sudo nano /etc/nginx/sites-available/example
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📌 Add the following configuration:
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| server {
listen 80;
listen [::]:80;
server_name public_ip_or_domain_name;
proxy_redirect off;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
location / {
proxy_pass http://127.0.0.1:8080;
}
}
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| # Enable the Nginx configuration
sudo ln -s /etc/nginx/sites-available/example /etc/nginx/sites-enabled/
# Restart Nginx service to apply changes
sudo systemctl restart nginx.service
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❗ Fix Error: 413 Request Entity Too Large on Nginx
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| # Open Nginx config file
sudo nano /etc/nginx/nginx.conf
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📌 Add or update the following line inside the http {} block:
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| http {
...
# Allow larger file uploads
client_max_body_size 100M;
...
}
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| # Reload Nginx configuration
sudo nginx -s reload
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🎯 Conclusion
✔️ Tomcat 9 is successfully installed and running on your Ubuntu/Linux VPS!
✔️ Nginx is configured as a reverse proxy for better security and performance.
✔️ Now, your Tomcat server is accessible via your domain or public IP! 🚀
