Our system looks like this:
[internet]
[load balancer] [load balancer]
| \/ | \/ A
[web] [web] [web] <---mysql cluster
\ | /
[imap server]
The web servers are all sharing their sessions which are stored in a
mysql cluster. This means that the user can connect to any web server
and still maintain their session.
However we've just found another problem - attachments. The user
connects to webserver1 and clicks the Compose button. They then upload
an attachment onto webserver1 and compose their message. When they press
Send, the request actually (due to round robin dns) hits webserver2.
Webserver2 tries to load in the attachment but can't find it.
We don't really want to be storing 30MB attachments in a database as
well and using a shared NFS attachment driectory introduces a single
point of failure (the NFS server). Can anyone think of any other options
we have?
Best wishes,
Daniel
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