Alright, let's break down this Tomcat minor version upgrade for your RHEL 8.10 system—since we're moving from 9.0.56 to 9.0.105 (same major version), this is a low-risk process but we'll make sure to cover all bases to avoid any hiccups.

1. Pre-Upgrade Preparation #

• Backup everything first (this is non-negotiable):
  • Back up your entire existing Tomcat installation directory. Replace /opt/tomcat with your actual Tomcat path:

    cp -r /opt/tomcat /opt/tomcat_9.0.56_backup_$(date +%Y%m%d)
    

  • If you have separate application data or external configs tied to Tomcat, back those up too.
• Verify the current Tomcat status to confirm it's running (or note if it's stopped):

  systemctl status tomcat  # If using systemd
  ps aux | grep tomcat     # Alternative way to check running processes
  

2. Download & Extract the New Tomcat Version #

• Grab the Tomcat 9.0.105 binary tar.gz package (you can get this from the official Apache Tomcat archive). Once downloaded, extract it to a temporary directory:

  tar -xzf apache-tomcat-9.0.105.tar.gz
  

3. Stop the Running Tomcat Service #

• Shut down Tomcat cleanly:

  systemctl stop tomcat  # For systemd-managed instances
  # OR
  /opt/tomcat/bin/shutdown.sh  # If using manual startup scripts
  

• Double-check that all Tomcat processes are stopped to avoid conflicts:

  ps aux | grep tomcat
  

  Ensure no active Tomcat-related processes show up (ignore the grep process itself).

4. Replace Core Tomcat Files (Preserve Custom Configs & Apps) #

Minor upgrades only require replacing the core runtime files—we'll keep your custom configurations, web apps, and logs intact. Assume your Tomcat is installed at /opt/tomcat:

• Delete the old bin and lib directories (these contain the outdated runtime):

  rm -rf /opt/tomcat/bin /opt/tomcat/lib
  

• Copy the new bin and lib directories from the extracted 9.0.105 package to your installation path:

  cp -r apache-tomcat-9.0.105/bin /opt/tomcat/
  cp -r apache-tomcat-9.0.105/lib /opt/tomcat/
  

• Merge new configuration files (if needed): Compare the default configs from the new package with your existing ones to catch any new settings:

  diff -r apache-tomcat-9.0.105/conf /opt/tomcat/conf
  

  If there are new config files or updated default values, merge them into your existing configuration (don't just overwrite—this could break custom settings like port numbers or SSL configs).

5. Fix Permissions #

Ensure the Tomcat runtime user (usually tomcat) has proper access to the updated files:

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

6. Start Tomcat & Validate the Upgrade #

• Fire up the updated Tomcat service:

  systemctl start tomcat  # For systemd
  # OR
  /opt/tomcat/bin/startup.sh  # Manual startup
  

• Check the service status to confirm it started successfully:

  systemctl status tomcat
  

• Verify the version:
  • Visit http://your-server-ip:8080 in a browser—look at the bottom of the default Tomcat page to confirm the version is 9.0.105.
  • Or check via command line:

    /opt/tomcat/bin/version.sh
    

• Test your web applications thoroughly to ensure they load and function as expected.

7. Rollback Plan (Just in Case) #

If you run into issues post-upgrade:

1. Stop Tomcat immediately:

   systemctl stop tomcat
   

2. Restore your backup:

   rm -rf /opt/tomcat
   cp -r /opt/tomcat_9.0.56_backup_YYYYMMDD /opt/tomcat
   

3. Start the restored service:

   systemctl start tomcat
   

   Replace YYYYMMDD with the date from your backup filename.

内容的提问来源于stack exchange，提问作者AKASH BHAT