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Hey guys,
We've been noticing some really strange behavior with keepalived/LVS when a
real_server fails. The behavior we see is that when a r_s fails, all the
persistent connections on that server fall over to a single server.
For example:
Server 1 - 25000 active conn. - 1500 inactive conn.
Server 2 - 35000 active conn. - 1000 inactive conn.
Server 3 - 20000 active conn. - 500 inactive conn.
Server 2 fails. Instead of seeing all the traffic split between the remaining
real_servers, we see it all clump over to the same server
Server 1 - 25000 active conn. - 1500 inactive conn.
Server 2 - failed
Server 3 - 55000 active conn. - 1500 inactive conn.
Now, server 3 falls over and dies due to having too many connections on it and
becoming overloaded.
We've seen this behavior consistently in all of our keepalived installations
(20 servers or so? Median of about 20 virtual_servers each), and I was curious
if this is configurable behavior, or even expected.
Thanks!
Jason Faulkner
Linux Engineer, Rackspace Email & Apps
jason.faulkner@xxxxxxxxxxxxx<mailto:jason.faulkner@xxxxxxxxxxxxx>
o: (540) 443-2101 (ex. 505-2101)
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