Master -Slave Configuration Prerequisites And Restore Operations - Cisco CISCOWORKS COMMON SERVICES 3.0 User Manual

Chapter 3 Configuring the Server
Effects of Backup-Restore on DCR

Master -Slave Configuration Prerequisites and Restore Operations

DCR Master Slave setup requires you to perform certain tasks prior to
Master-Slave configuration, to enable proper, and secure communication between
them. This involves copying certificates, and setting up a valid system identity
user. For details, see "Master-Slave Configuration Prerequisites" section on
page 4-27.
Restore operations can affect Master-Slave relationships because it may modify
these pre-configured parameters.
For example, let M1 be the Master, and S1 its Slave. Let X be a standalone server.
Suppose you take a backup from S1, and restore the backed up data, say S1b on X.
Now, X has to be in Slave mode.
Since, M1 and S1 already shared a Master -Slave relationship, M1 will have the
peer certificate of S1, and S1 will have the certificate of M1.
After the restore operation, X will get the certificate of M1. However, if peer
certificate of X is not present on M1, X will not be able to have M1 as its Master.
So you have to ensure that the certificates of the peer machines are in place, before
you do a restore.
Other Master-Slave configuration prerequisites such as System Identity user
configuration and Peer Server Account user configuration might get affected by
restore operations.
For example: In M1 you have Joe as a Peer Server User and in S1 you add Joe as
a System Identity user. You take a backup from S1.
After you take the backup, say you change the Peer Server User and System
Identity User to Bob.
Now if you restore the backed up data, say S1b the system Identity User would
not be the Bob anymore. This will upset the Master-Slave relationship.
During restore you are prompted to confirm whether you need to overwrite the
SSL certificate.
SSL certificates are tied to individual machines. So if you take a backup on one
machine and restore it on another, you should be careful not to overwrite the SSL
certificate.
However, if you backup data from a machine and restore it to the same machine,
you may overwrite the SSL certificate.
User Guide for CiscoWorks Common Services
3-66
78-16571-01