Re: Director Failover

> Does a connection *always* survive a director failover ?

I'm no sync guru, your question should get better answered on the LVS
mailing list :)
BTW, here is what I understand (simplified) :
Once a connection is established, the master sync daemon (on the active
director) sends data to the backup sync daemon (on the backup director).
The backup director is then aware of an established connection. If the
primary director fails, the backup will take over and still forward
packets from an established connection to the right reral server.

This works fine on long lasting connections (interactive sessions like
FTP, telnet, SSH and so on) but doesn't on short connections (http
without keepalive for example).

> So it seems to me it's not *always* that a connection can survive
> a director failover. Am I right ?

It won't *always* survive for a very simple reason : if the primary
director fails before its master sync daemon can send data about the new
connections to the backup sync daemon, the backup won't forward incoming
packets (related to a formerly established connection) because it
doesn't know the connection.

> P.S. I had the syncdaemon up in both primary and
> backup director as shown below:
> root      7933     1  0 15:00 ?        00:00:00 [ipvs syncbackup]

Just to make sure, do you have a sync master and a sync backup ?

-- 
Sébastien Bonnet
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