Allow a Tomcat9 webapp to read/write to a folder

fr:Autoriser une webapp Tomcat9 à lire/écrire dans un dossier
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Introduction

We will see how to authorize a Tomcat9 webapp under Debian to read and write in a folder. Because under Debian the system rights are not enough for Tomcat, it is indeed put in "sandbox" mode by Systemd and has only write access to the :

   - /var/lib/tomcat9/conf/Catalina
   - /var/lib/tomcat9/logs 
   - /var/lib/tomcat9/webapps
   - /var/lib/tomcat9/work 

Course

To override this security, you have to edit the Tomcat9 configuration file of Systemd /etc/systemd/system/multi-user.target.wants/tomcat9.service, configuration file, then in the :

[Service]

Add, to for example allow access to the directory /data/ :

ReadWritePaths=/data/

Once the modification is done, you have to reload the Systemd daemon:

# systemctl daemon-reload

Then restart Tomcat9 :

# service tomcat9 restart

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