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Migrating from previous Tomcat packages
---------------------------------------

* Refer to the upstream migration guides for application compatibility
and configuration changes:
- http://tomcat.apache.org/migration-7.html
- http://tomcat.apache.org/migration-8.html
- http://tomcat.apache.org/migration-85.html
- http://tomcat.apache.org/migration-9.html

* Before the version 9 the Debian packages for Tomcat each created their
own tomcat<n> users. You may need to recursively update your application
directories to be owned by the tomcat user. This user will no longer
change for the future upgrades.

Getting started
---------------

* After installing the tomcat9 package, the server should be accessible
at http://localhost:8080/

* The default port 8080 can be changed by modifying the port of the
connector in /etc/tomcat9/server.xml. Privileged ports (such as 80 or 443)
can be used with no extra configuration.

* If you install tomcat9-admin, you have to define an admin account to
access the manager interface. Edit /etc/tomcat9/tomcat-users.xml and
follow the instructions in the comments. The Tomcat manager will be
accessible at http://localhost:8080/manager/html

* Tomcat is not running under a Java security manager by default. If you
expose your Tomcat instance to the internet, please consider editing
your /etc/default/tomcat9 file and set SECURITY_MANAGER="true", then
adjust policy files in /etc/tomcat9/policy.d/ as explained in
https://tomcat.apache.org/tomcat-9.0-doc/security-manager-howto.html

* Tomcat is sandboxed by systemd and only has write access to the following
directories:
- /var/lib/tomcat9/conf/Catalina (actually /etc/tomcat9/Catalina)
- /var/lib/tomcat9/logs (actually /var/log/tomcat9)
- /var/lib/tomcat9/webapps
- /var/lib/tomcat9/work (actually /var/cache/tomcat9)

If write access to other directories is required the service settings
have to be overridden. This is done by creating an override.conf file
in /etc/systemd/system/tomcat9.service.d/ containing:

[Service]
ReadWritePaths=/path/to/the/directory/

The service has to be restarted afterward with:

systemctl daemon-reload
systemctl restart tomcat9

* To run more than one Tomcat instance on your server, install the package
tomcat9-user and run the tomcat9-instance-create utility.
You should remove the tomcat9 package if you don't want Tomcat to
start as a daemon at boot time.
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Tomcat9 README.Debian - Cronologia

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