Red Hat ENTERPRISE LINUX AS 2.1 -, Installation Manual

Page: 143 / 210

Section 9.6:
VIRTUAL SERVERS
143
Enter the name of the network device to which you want the floating IP address defined the
Virtual IP Address
field to bind.
You should alias the public floating IP address to the Ethernet interface connected to the public
network. In this example, the public network is on the
eth0
interface, so
eth0:1
should be
entered as the device name.
Re-entry Time
Enter an integer value which defines the length of time, in seconds, before the active LVS router
attempts to bring a real server back into the cluster after a failure.
Service Timeout
Enter an integer value which defines the length of time, in seconds, before a real server is con-
sidered dead and removed from the cluster.
Quiesce server
When the Quiesce server radio button is selected, anytime a new real server node comes online,
the least-connections table is reset to zero so the active LVS router routes requests as if all the real
servers were freshly added to the cluster. This option prevents the a new server from becoming
bogged down with a high number of connections upon entering the cluster.
Load monitoring tool
The LVS router can monitor the load on the various real servers by using either
rup
or
rup-
time
. If you select
rup
from the drop-down menu, each real server must run the
rstatd
service. If you select
ruptime
, each real server must run the
rwhod
service.
CAUTION
Load monitoring is not the same as load balancing and can result in
hard to predict scheduling behavior when combined with weighted
scheduling algorithms. Also, if you use load monitoring, the real
servers in the cluster must be Linux machines.
Scheduling
Select your preferred scheduling algorithm from the drop-down menu. The default is
Weighted least-connection
. For more information on scheduling algorithms, see
Section 6.3.1, Scheduling Algorithms.
Persistence