What options are available for adding fail-over capabilities to Confluence? I'm not worried about scalability, more about have a recently synced copy of the Wiki available in case our production Wiki isn't available.
Has anyone tried using MySQL repliction?
Is there a VM or 'snapshot' solution available?
I've not used MySQL replication, but I have implemented Confluence with a cold-standby for failover with Oracle dataguard and that worked well enough as manual failover with a short period of downtime (1 hour) to carry out the failover was acceptable. For that implementation we stored all of the attachments in the database so didn't need to worry about sync'ing the attachments to the failover server or back again.
We used a developer license (http://confluence.atlassian.com/display/DOC/Getting+a+License+for+a+Staging+Environment) for the cold-standby and the 2 Confluence nodes were fronted by a Netscaler load balancer with traffic to the standby node disabled.
I've also implemented failover with both Confluence nodes pointed at the same database, but making sure that only one node was active at any one time and didn't get any problems with data corruption or cluster panics. That implementation also used Oracle dataguard to sync the database to a backup, but we could failover Confluence nodes without also having to failover the database.
I'd avoid VM snapshots for backups or failover as that's not what they're designed for, but if you're talking about running Confluence in a virtualised environment so you can migrate VM's if there are problems with the host then that should be fine (http://confluence.atlassian.com/display/DOC/Running+Confluence+in+a+Virtualised+Environment)
Hope that's of some help?
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