/var/ftp/ directory activates the anonymous account.
vsftpd package. This package establishes a directory tree for anonymous users and configures the permissions on directories to read-only for anonymous users.
Warning
/var/ftp/pub/.
mkdir /var/ftp/pub/upload
chmod 730 /var/ftp/pub/upload
drwx-wx--- 2 root ftp 4096 Feb 13 20:05 upload
Warning
vsftpd, add the following line to the /etc/vsftpd/vsftpd.conf file:
anon_upload_enable=YES