Is there an automatic way to make all root site directories writable (/var/www/clients/GID/UID) Now the owner of /var/www/clients/GID/UID is root instead of user (UID). The problem with this kind of setup is that the user can not write to the root directory and is force to put all config and library files in web directory.
The user shall not be able to wrote to this directory, thats why it is set to root. If the directory would be writable for the user the user would be able to break out of the chroot jails.
If I don't use jailkit and don't give users ssh access does the directory become writable or I have to change something?
The directory never becomes writable. If you want to change that you will have to change the apache server plugin for ispconfig.
