Installation guide

T ab le 2.2. En ab led IP Po rt s o n a C o mp u t er T h at Ru n s lu ci

IP Po rt N u mb er Pro t o co l Co mpo n en t

8084 TCP lu ci (Co n g a user interface server)

11111 TCP

ricci

(

Co n g a

remote agent)

If your server infrastructure incorporates more than one network and you want to access lu ci from

the internal network only, you can configure the st u n n el component to listen on one IP address

only by editing the LUCI_HTTPS_PORT parameter in the /etc/sysconfig/luci file as follows:

LUCI_HTTPS_PORT=10.10.10.10:8084

2.4 . Configuring ACPI For Use wit h Int egrat ed Fence Devices

If your cluster uses integrated fence devices, you must configure ACPI (Advanced Configuration and

Power Interface) to ensure immediate and complete fencing.

Note

For the most current information about integrated fence devices supported by Red Hat Cluster

Suite, refer to http://www.redhat.com/cluster_suite/hardware/.

If a cluster node is configured to be fenced by an integrated fence device, disable ACPI Soft-Off for

that node. Disabling ACPI Soft-Off allows an integrated fence device to turn off a node immediately

and completely rather than attempting a clean shutdown (for example, shutdown -h now).

Otherwise, if ACPI Soft-Off is enabled, an integrated fence device can take four or more seconds to

turn off a node (refer to note that follows). In addition, if ACPI Soft-Off is enabled and a node panics

or freezes during shutdown, an integrated fence device may not be able to turn off the node. Under

those circumstances, fencing is delayed or unsuccessful. Consequently, when a node is fenced with

an integrated fence device and ACPI Soft-Off is enabled, a cluster recovers slowly or requires

administrative intervention to recover.

Note

The amount of time required to fence a node depends on the integrated fence device used.

Some integrated fence devices perform the equivalent of pressing and holding the power

button; therefore, the fence device turns off the node in four to five seconds. Other integrated

fence devices perform the equivalent of pressing the power button momentarily, relying on the

operating system to turn off the node; therefore, the fence device turns off the node in a time

span much longer than four to five seconds.

To disable ACPI Soft-Off, use chkconfig management and verify that the node turns off immediately

when fenced. The preferred way to disable ACPI Soft-Off is with chkconfig management: however, if

that method is not satisfactory for your cluster, you can disable ACPI Soft-Off with one of the

following alternate methods:

Changing the BIOS setting to "instant-off" or an equivalent setting that turns off the node without

delay

Red Hat Ent erprise Linux 5 Clust er Administ rat ion