So, you have a web server and would like to modify the content via vsftpd. After you have installed vsftpd, modify /etc/vsftpd.conf:
# Enable this to allow users to write files to their web folder write_enable=YES # To restrict users to specific web folders and block access to parent folders chroot_local_user=YES # You may want to enable passive mode if you have a firewall pasv_enable=YES pasv_min_port=65000 (example, set your own) pasv_max_port=65535 (example, set your own) # Also remember to open up port 20 for FTP-DATA, 21, and 990 for TLS/SSL on your firewall
Next create your users and add them to the web group
useradd -s /usr/sbin/nologin {new_username}
sudo passwd {new_username} # you will be prompted to enter a password twice
sudo usermod -d /var/www/{web folder} {new_username}
usermod -a -G www-data {new_username}
Next, modify /etc/shells by adding the following line at the bottom:
/usr/sbin/nologin
Finally, restart your ftp server
service vsftpd restart
Now test your new web ftp user account and check if the directory is writable and also make sure the pages are viewable in a browser.