Grant Tomcat 9 Access to Other Files

Granting Tomcat 9 Access to External Files

Sometimes, you may need Tomcat 9 to access files located in different directories on your Linux system. This requires adjusting file and directory permissions on the Linux side without modifying Tomcat’s internal configuration.

Steps to Grant Access

1. Create a user group and add Tomcat to it

First, create a group named webserver and add the Tomcat 9 user to this group:

sudo groupadd webserver

sudo usermod -a -G webserver tomcat9

1. Change group ownership of the required files

Update the group ownership of the file that Tomcat needs to access:

sudo chgrp webserver configuration.yaml

Grant read and write permissions to the webserver group:

sudo chmod g=rw configuration.yaml

1. Restart Tomcat to apply changes

sudo systemctl restart tomcat9

1. Update group ownership and permissions for directories

If tomcats needs access to entire directories, update their group ownership and permissions:

sudo chgrp webserver /opt/internal/data/

sudo chgrp webserver /opt/internal/

Grant read, write, and execute permissions to the webserver group:

sudo chmod g=rwx /opt/internal/data/

sudo chmod g=rwx /opt/internal/

Following these steps will ensure Tomcat 9 has the necessary permissions to access files and directories as required.