title: How to allow Tomcat war app to write in folder
body: <p>I'd like for my webapp which is deployed as a war <code>ROOT.war</code> to have write access to <code>/var/www/html/static/images</code> so that it can write uploaded and converted images to that folder so nginx can serve it statically. Currently it doesn't work and triggers a <code>java.nio.file.FileSystemException</code> exception together with the <code>Filesystem is read-only</code> message.</p>
  <p>But the filesystem is not read-only and is in great condition. The folder has already been chmodded 777.</p>
  <p>Extra info:
  The tomcat setup is running on an Ubuntu 18.04 Azure VM with managed disk. The folder is residing on an Ext4 formatted drive</p>