System Configuration Prerequisites

Before starting the discovery procedure, make sure the following prerequisites are met:

• Verify Names Resolution

• Verify Firewall Configuration

Verify Names Resolution

The Enterprise Manager OMS servers require direct network access to each of the compute nodes. If the names of the compute nodes are not registered in the OMS nodes' DNS, then they must be manually entered in the /etc/hosts file for each OMS.

To manage the Exadata Cloud Service components from Enterprise Manager Cloud Control 13c, your local machine must be able to resolve the host name of Cloud Control 13c.

Verify Firewall Configuration

To verify the firewall configuration:

1. Open Database Ports

   The database listener ports must be opened for the Enterprise Manager OMS servers. Note that Exadata Cloud Service databases will use SCAN listeners; so, ports will need to be opened for the base compute node, the compute node virtual IP, and scan listeners addresses.

   For example, if an Exadata Cloud Service quarter rack has been configured with two compute nodes - exadbnode1.example.com and exadbnode2.example.com - and the listeners are using port 1521, then port 1521 will have to be opened to the Enterprise Manager Server for the following addresses:

   • The compute node hostnames - exadbnode1.example.com and exadbnode2.example.com

   • The virtual IPs for each compute node - exadbnode1-vip.example.com and exadbnode1-vip.example.com

   • The scan listener hostname - scan-exadatadb

2. Open Enterprise Manager Upload Port

   The Enterprise Manager Cloud Control 13c agents require access to the Enterprise Manager Servers upload service, normally configured on port 4889 for HTTP uploads and 4900 for HTTPS. To verify the ports assigned, run the following command on the OMS server command line.

   $ emctl status oms -details
   

   These ports must be opened for each of the compute nodes.

3. Open Agent Ports

   The OMS servers must be able to connect to the Enterprise Manager Cloud Control 13c agent HTTP/HTTPS port on each compute node. The agent port defaults to 3872. If port 3872 is not available, the next available port starting from port 1830 is used.

   To identify the port used:

   • Run the following command on the compute node command line:

     $ emctl status agent
     

   • Alternatively, you can look for the value of the EMD_URL property in the emd.properties file the following directory:

     <AGENT_HOME>/agent_inst/sysman/config
     

Table 2-1 Firewall Ports

Component	Notes
OMS	Upload http/https port - usually 3872
Agent	The OMS servers will need to be able to connect to the Enterprise Manager Cloud Control Agent HTTP/HTTPS port on each compute node. The agent port defaults to 3872. If port 3872 is not available, the next available port starting from port 1830 is used.