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From Francois Gaudreault <>
Subject Re: Connect to a MySQL Galera Cluster
Date Sun, 26 Jan 2014 16:44:24 GMT
I just noticed some DB HA parameters in the file. 
Anyone ever tried them?

It looks like CloudStack is able to handle slaves and autoReconnectForPool?

> I was not able to get much information but Looks like it does not manage sessions
> across the cluster. So if a node fails, all sessions currently handled by
> the node will eventually timeout and fail.
> It is up to the client now to open new connections.
> One way to work around the session handling issue would be to use a
> L7 proxy that can talk MySQL. I think mysql-proxy can do that but
> its alpha(?) s/w. Also, mysql-proxy itself is not HA.
> The other way would be to make the whole fault tolerance an app problem. If
> the app could automagically reconfigure itself to do round robin writes
> across the galera cluster based on health checks, we will get “HA” automatically.
> A failed node would end up being blacklisted by the app.
> As of now, I don’t see any other way other than to force a CloudStack restart
> in response to a galera node failure.
> Hoping someone with more db-foo can tell us more.
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Francois Gaudreault
Architecte de Solution Cloud | Cloud Solutions Architect
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Montréal QC  H3J 1S6

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