103 oc3 #public3
192.168.1.103 poc3 #private3
192.168.2.178 voc3 #virtual3
A couple things are worth noting at this point. I only need two network cards on each server;
why is there a ???virtual??? address for each node? The virtual addresses support rapid connect-time
failover, a concept I will explore in more detail later in this chapter. All client connections use
these virtual addresses for their connections, and each RAC node??™s listener will be listening on the
virtual nodes instead of the public node names. Note also that each virtual address must be on
the same subnet as the public address; the private interconnect network, however, is on its own
private subnet.
TIP
Before proceeding with any Oracle software installations, be sure that
you can connect from each node in the cluster to every other node
using the ssh command that does not prompt for a password for the
oracle user; in addition, ensure that ssh
does not return a login banner.
User Accounts
Other than the root account, the only other account needed on your Linux server is the oracle
account; in fact, in a production environment, you may not want any other user accounts on
the server to prevent any inadvertent or intentional access of critical database files, control files,
executables, or password files.
Chapter 10: Real Application Clusters 357
The groups oinstall and dba must exist on each node in the cluster, in addition to the oracle
user.
Pages:
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575