Sync files on two servers?

japanmoran

I am looking for a good way to sync files automagically through php...users are uploading files to one server and I want to then transfer them via ftp to another remote server...kinda like a watch folder...any ideas?

Local server is your basic LAMP install...

Thanks

rpanning

Take a look at the ftp functions. Particularly the example here.

japanmoran

Yes, I have been looking at the examples, but what I am wondering is how to handle the situation if multiple users upload at the same time. Let me better explain:

This web system is somewhat like a content management system for multiple clients. For simplication sake, let us say there are 2 clients and 2 end users. The end users can upload files for either client. So user 1 uploads 2 files, one for client a and one for client b. User 2 comes in and uploads 2 files for client a. I want to be sure that the files are transfered correctly, do not overwrite each other, etc.

Anyone doing something like this?

TIA

rehfeld

its gonna be tough trying to avoid a race condition across multiple servers.

i can think of a few things you could do to minimize the race conditions, but not prevent them.

could you have 1 server be a master, and the other a slave/mirror?

like for example, uploading to server B, doesnt directly save the file. server B, being the slave, would need to contact server A and hand the file to A, and let A decide if it should save it or not.

japanmoran

That sounds good. They are essentially going to be "master - slave" anyway - I already have a system that does uploads to our local isp server but for some clients they are going to need to be on a CDN (vitalstream) so I thought I would keep the code I have and just add on a transfer up to the other server. It will just be one way - files will go to our server and then to theirs - never the other way around.

Thanks.