Rebuilding OAM Deployment in a Multi-Node Cluster

The OAM Snapshot Tool supports the following operations in a multi-node cluster:

Scale-Out: Clone a Managed Server on a new infrastructure.
Backup and Restore: Rebuild Admin Server and Managed Server cluster on new infrastructure.
Migration: Rebuild Admin and the Managed Server cluster on new infrastructure and migrate the database schemas to a new infrastructure.

In this section, the following example is used to describe the steps to rebuild the OAM deployments on the target infrastructure:

Source Infrastructure has:

Infra1 that runs adminserver
Infra2 that runs oam_server1
Infra3 that runs oam_server2

Target Infrastructure has:

Infra1A for rebuilding adminserver
Infra2A for rebuilding oam_server1
Infra3A for rebuilding oam_server2

Rebuilding Admin Server on a New Infrastructure

To rebuild the Admin Server on a new infrastructure, follow the procedures provided in Performing Backup and Restore and Migration of OAM Sytem Using Snapshot Tool.

Rebuilding Managed Servers on New Infrastructure

Prerequisite: In case of backup and restore, and migration scenarios, you must perform the following step:

After rebuilding the Admin Server on a new Infrastructure (for example, Infra1A), you must again create a backup of the Admin Server on Infra1A. This step is not required for the scale-out operation.

For each of the Managed Server in the cluster (for example, Infra2 and Infra3), perform the following steps on the target infrastructure (Infra2A and Infra3A):

Copy all the binaries from MW_HOME directory in the source infrastructure to the corresponding path on the target infrastructure.

Note:
MW_HOME is the path where OAM binaries are installed.
From the new infrastructure that hosts the Admin Server (for example, Infra1A), copy the files oam.properties and OamFileArtifacts.properties from $MW_HOME/idm/oam/server/upgrade/script to the corresponding path on the target infrastructure (Infra2A and Infra3A) where the Managed Servers needs to be rebuilt.

Note:
The oam.properties and OamFileArtifacts.properties are generated by the moveToDB.sh and extract_from_db.sh scripts during the backup and restore, or migrate operations performed on the Admin Server.
On the target infrastructure, run the following command to create the domain:
```
$JAVA_HOME/bin/java 
-cp $MW_HOME/idm/oam/server/tools/dbconfigutility/dbconfig-utility.jar 
-Doracle.jdbc.timezoneAsRegion=false oracle.security.am.artifacts.main.AccessDBCommand 
./oam.properties $ORACLE_HOME extractFromDB
```
Note:

MW_HOME is the directory path where the OAM binaries are installed and ORACLE_HOME is the bath path where OAM domain has been created.
Make the startup scripts executable using the following command:
```
chmod +x <PATH_TO_DOMAIN>/bin/*.sh
```
Restart the Managed servers by providing the Admin Server T3 URL. For example, ./startManagedWeblogic.sh oam_server1 t3://adminhost:adminport on Infra2A and ./startManagedWeblogic.sh oam_server2 t3://adminhost:adminporton Infra3A.