Sean Drill wrote:
> I am however only able to get piranha/lvs to do load sharing. In this
> case as long as both servers are set to UP, then traffic will be
> balanced between all servers (determined by load balancing scheme and
> weighting.) What I am attempting to do is create a virtual server in
> LVS, which has two active REAL servers, however direct traffic only to
> one of them, unless otherwise directed or if the active member fail,
> then direct traffic to the backup.
>
The behaviour you want is achieved with a sorry server. Basically, the
first RS is on it's own in the pool, and the second RS is defined as a
sorry server, or failback, depending on the vocabulary.
Here is an example using keepalived. The first virtual service (fwmark
10) is a load balancing across the 2 RS, and the second (fwmark 11) is
in active/passive. Keep in mind to also detect failure of the backup RS
to be able to repare it before you need to use it.
virtual_server fwmark 10 {
delay_loop 6
lb_algo wlc
lb_kind DR
protocol TCP
real_server 172.31.241.64 3306 {
weight 100
MISC_CHECK {
misc_path "/usr/local/bin/check_mysql2.sh 172.31.241.64"
misc_timeout 10
misc_dynamic
}
}
real_server 172.31.241.66 3306 {
weight 100
MISC_CHECK {
misc_path "/usr/local/bin/check_mysql2.sh 172.31.241.66"
misc_timeout 10
misc_dynamic
}
}
}
virtual_server fwmark 11 {
delay_loop 6
lb_algo wlc
lb_kind DR
protocol TCP
sorry_server 172.31.241.66 3306
real_server 172.31.241.64 3306 {
weight 100
MISC_CHECK {
misc_path "/usr/local/bin/check_mysql_fo.sh 172.31.241.64"
misc_timeout 10
}
}
}
--
Thomas
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