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126 Chapter 10. Configuring the LVS Routers with Piranha Configuration Tool
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 op-
tion 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
ruptime
. 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 algo-
rithms, see Section 7.3.1 Scheduling Algorithms .
Persistence
If an administrator needs persistent connections to the virtual server during client
transactions, enter the number of seconds of inactivity allowed to lapse before a con-
nection times out in this text field.
Important
If you entered a value in the Firewall Mark field above, you should enter a value
for persistence as well. Also, be sure that if you use firewall marks and persistence
together, that the amount of persistence is the same for each virtual server with
the firewall mark. For more on persistence and firewall marks, refer to Section 7.5
Persistence and Firewall Marks .
Persistence Network Mask
To limit persistence to particular subnet, select the appropriate network mask from the
drop-down menu.