export FTP_USER="test"
export FTP_PASSWORD="test"

docker run
    --name mock_ftp_server
    --publish 21:21
    --publish 4559-4564:4559-4564
    --env FTP_USER="$FTP_USER"
    --env FTP_PASSWORD="$FTP_PASSWORD"
    --detach
  panubo/vsftpd

$ curl --upload-file /tmp/mock.data-2017-03-28.tar.gz ftp://localhost --user $FTP_USER:$FTP_PASSWORD
% Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                               Dload  Upload   Total   Spent    Left  Speed
0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
curl: (25) Failed FTP upload: 553