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Stephen Amadei wrote:
> So I have a four box HA and LB UltraMonkey setup... two LBs and two Real
> servers.
>
> Each Real Server runs HTTP and MySQL. Both have separate VIP IPs, and I can
> use them fine from outside the LVS cluster. I wanted to have the HTTP
> servers access the MySQL VIP session... but this doesn't work.
>
> Doing a:
>
> mysql -u root -p mysql -h [VIP.ip.address]
>
> from the real server prompts me for a password and hangs. Doing a ipvsadm
> -Lnc shows a connection entry in a SYN_RECV state going from my real server
> to the VIP and being translated.
>
> I have tryed this with iptables doing NAT and with it not doing NAT.
>
> Why would this not work?
>
I assume you have some sort of web application that uses a database. Why
not have you're both RS web apps using a MySQL connection to localhost.
Then you modify UltraMonkey to use not a simple tcp check, but a much
deeper app-levle check, that check as well the db connection. In case of
an issue with the DB, the RS will be de-activated, and will only remain
the RS that has a healthy DB connection.
--
Thomas
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