Installation guide

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.