On Fri, Jan 9, 2015 at 2:54 AM, Pavlos Parissis <[email protected]> wrote: > > Στις 8 Ιαν 2015 4:39 ΜΜ, ο χρήστης "Alfredo Gutierrez" > <[email protected]> έγραψε: >> >> I am trying to setup a LB for one of my clients that is for two WS_FTP >> windows servers. I have configured HAProxy already but I am not getting any >> redirecting when I ftp to the LB server. I have searched through the net and >> forums for any help on this, is there any write ups for this type or setup? >> > > FTP protocol uses 2 ports for communication between end points. > It uses port 21 for establishing a control channel and another random port > for data transfer. The selection for that random port and which end point > initiates the connection for the data transfer depends on the running mode > of ftp server. There are 2 types of running mode for ftp servers, the active > mode in which client informs the server about the port is listening for a > connection and the passive mode where server informs the client about the > port is listening for a connection. >
I've had passive mode working in the past through HAProxy, where I told my FTP server(s) the port range to use for passive connections and then bound HAProxy to those ports. The caveat is that for each separate backend FTP server, you need a different port range, so you could run out of ranges depending on how many servers you want. http://www.taitclarridge.com/techlog/2012/09/ftp-load-balanced-through-haproxy.html
