Quoting Andre Nathan <andre@xxxxxxxxxxxxxxx>:
Hello I'm setting up a two-machine cyrus cluster using OCFS2 over DRBD. The setup is working fine, and I'm now considering the load balancing options I have.
For Clustering Cyrus have a look at http://cyrusimap.web.cmu.edu/twiki/bin/view/Cyrus/CyrusCluster I have no experiance with OCFS2 but an active-active cyrus cluster on a shared filesystem is tricky at best.
I believe the simplest option would be to simply rely on DNS load balancing. However, for this to work, I need to consider what happens when one of the cluster nodes fails, regarding the clients which access the cluster:
Depending on the OS and Networksetting this can take some time, because the OS and relaying DNS-server may cache the result.
- Will IMAP and POP3 clients automatically try the second DNS entry if connecting to the first one fails? - Will the LMTP client also do this? I'm using the postfix LMTP client for delivery.
The will try to reconnect but might use the old DNS answer.
Does any one have experience with this kind of setup?
We use this kind of loadbalancing for web-proxys and smtp-server but if one node fails there are some clients that try to connect the failed node You should take a look at ClusterIP, Cyrus Murder and Cyrus Replication
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