请求提供RHEL 8.10环境下Apache Tomcat从9.0.104版本迁移至9.0.105/9.0.109或最新版本的完整步骤

Hey there, let's get your Tomcat upgraded safely to patch those vulnerabilities. I’ll walk you through every step, assuming you’ve got a standard Tomcat setup (just adjust paths if yours is custom).

Prerequisites #

• You have sudo/root access to your RHEL 8.10 server
• Tomcat is currently running (we’ll stop it first)
• You know the user/group Tomcat runs as (usually tomcat:tomcat)

1. Stop Tomcat & Backup Everything First #

Always start with a backup—this is your safety net if something goes wrong.

• Stop the Tomcat service:

  # If using systemd (most common setup)
  sudo systemctl stop tomcat
  
  # If using the shutdown script directly
  sudo /usr/local/tomcat/bin/shutdown.sh
  

• Create a full backup of your current Tomcat installation:

  sudo tar -czf tomcat-backup-$(date +%Y%m%d).tar.gz /usr/local/tomcat
  

  Store this backup in a safe location (preferably not on the same server).

2. Download the Target Tomcat Version #

Head over to the official Apache Tomcat 9 download page and grab the tar.gz package for your target version (9.0.105, 9.0.109, or the latest stable 9.x release). You can either transfer the file to your server via SCP, or use wget directly with the download link:

# Replace [DIRECT_DOWNLOAD_LINK] with the actual link from the Apache website
sudo wget [DIRECT_DOWNLOAD_LINK]

3. Extract the New Tomcat Package #

Unpack the downloaded tar.gz file in your current directory:

# Replace [TARGET_VERSION] with your chosen version (e.g., 9.0.109)
sudo tar -xzf apache-tomcat-[TARGET_VERSION].tar.gz

4. Replace the Old Tomcat Installation #

• Rename your existing Tomcat directory to keep it as a fallback:

  sudo mv /usr/local/tomcat /usr/local/tomcat-old
  

• Move the new Tomcat directory to the standard installation path:

  sudo mv apache-tomcat-[TARGET_VERSION] /usr/local/tomcat
  

5. Migrate Your Custom Configurations & Applications #

Don’t just copy everything blindly—we want to keep your custom settings but use the new default configs where possible.

• Copy your critical custom files from the old installation:

  # Copy configuration files (server.xml, web.xml, context.xml, etc.)
  sudo cp -r /usr/local/tomcat-old/conf/* /usr/local/tomcat/conf/
  
  # Copy your deployed web applications (war files or expanded directories)
  sudo cp -r /usr/local/tomcat-old/webapps/* /usr/local/tomcat/webapps/
  
  # If you have custom libraries in lib/ (not default Tomcat libs), copy those too
  sudo cp /usr/local/tomcat-old/lib/*.jar /usr/local/tomcat/lib/
  

• Important: Compare the new default config files with your old ones to catch any changes. For example, check server.xml for port configurations or web.xml for security updates:

  sudo diff /usr/local/tomcat-old/conf/server.xml /usr/local/tomcat/conf/server.xml
  

  Merge any critical updates from the new config into your custom version (don’t just overwrite the new files entirely).

6. Set Correct Permissions #

Ensure the Tomcat user has full ownership of the new directory:

sudo chown -R tomcat:tomcat /usr/local/tomcat
sudo chmod +x /usr/local/tomcat/bin/*.sh

7. Start Tomcat & Verify the Upgrade #

• Start the Tomcat service:

  # Systemd method
  sudo systemctl start tomcat
  
  # Direct script method
  sudo /usr/local/tomcat/bin/startup.sh
  

• Check the logs to confirm successful startup:

  sudo tail -f /usr/local/tomcat/logs/catalina.out
  

  Look for lines like Server startup in X ms—that means it’s running without issues.
• Verify the version by accessing the Tomcat homepage (replace your-server-ip with your actual server IP):

  curl -s http://your-server-ip:8080 | grep "Apache Tomcat"
  

  You should see your target version listed here.
• Test your web applications thoroughly to make sure they’re working as expected.

8. Rollback Plan (Just in Case) #

If something breaks, revert to the old version quickly:

1. Stop the new Tomcat service:

   sudo systemctl stop tomcat
   

2. Remove the new directory and restore the old one:

   sudo rm -rf /usr/local/tomcat
   sudo mv /usr/local/tomcat-old /usr/local/tomcat
   

3. Start the old Tomcat service:

   sudo systemctl start tomcat
   

内容的提问来源于stack exchange，提问作者AKASH BHAT