Drupal permissions

drupal-permessions.txt

  # Create a new example user.
  useradd -s /bin/bash -m example;

  # Now add that user to the Apache group. On Ubuntu/Debian this group is usually
  # called www-data, on CentOS it's usually apache.
  usermod -a -G www-data example;

  # Set up a password for this user.
  passwd example;
)
su - example
cd docroot
cp sites/default/default.settings.php sites/default/settings.php

# Temporarily give the web server write permissions to settings.php
chgrp www-data sites/default/settings.php
chmod g+w sites/default/settings.php

# Create the directory.
mkdir sites/default/files

# Now set the group to the Apache group. -R means recursive, and -v means 
# verbose mode.
chgrp -Rv www-data sites/default/files

 chmod 2775 sites/default/files
 
 chmod g+w -R sites/default/files
 
 chmod 444 sites/default/settings.php