Last time when I performed upgrade from 11g Grid Control to 12c Cloud Control, I had to replace all existing 11g Oracle Agents to Agent 12c. Oracle stated that 11g Oracle Agents are not compatible with OEM 12c, so it left me with no other option than to install Oracle Agent 12c on all monitoring hosts.
Even though multiple Agent installation on different hosts is available in 12c cloud Control but for one time when you have to do install and configure Agent 12c on more than 150 hosts, you really do not want to do that and could there have been shortcut it could have ease your life.
The same question came to my mind again, do I have to replace all my existing 12c Agents if I upgrade to this new release. The answer is “NO” I do not have to replace my old Oracle Agent 12c.
Thanks to Oracle you do not have to do it but only if you have Oracle Management Agent 12c Release 3 or higher installed on your hosts.
YES, that’s true. Oracle Agent 12c is compatible with new release of Oracle Management Service 13c.
Mentioned below is the Compatibility table across OMS13c and Agent 12c.
| Releases | Oracle Management Agent 12c Release 3 (12.1.0.3) | Oracle Management Agent 12c Release 4 (12.1.0.4) | Oracle Management Agent 12c Release 5 (12.1.0.5) | Oracle Management Agent 13c |
| Oracle Management Service 13c | Yes | Yes | Yes | Yes |
There are some important points which you have to keep in mind before you begin Installing OEM 13c.
- Ensure that you have the latest Enterprise Manager Cloud Control software. {13c}
- You can refer to the “Oracle Enterprise Manager Cloud Control Advanced Installation and Configuration Guide.” for more information.
- Oracle Management Service 13c can communicate only with the above listed versions of Management Agents.
- Another important point to remember is while you download and run the OEM 13c software making sure there are no white spaces in the name of the directory.
- Example: do not download and run the software from a directory titled “EM Software” because there is a white space between the two words of the directory name.
- Through installation wizard, installation of OEM 13c Cloud Control can be done only on a single host, that is, locally on the server from where the wizard is invoked. Installation cannot be done on multiple or remote hosts.
- Do not set the ORACLE_HOME and ORACLE_SID environment variables, also you must ensure that the Oracle directories do NOT appear in the PATH.
- OEM13c onwards preinstalled JDK or Oracle WebLogic Server is no more supported.
- Java Development Kit (JDK) 1.7.0_80 and Oracle WebLogic Server 12c Release 1 (12.1.3.0) are installed as the part of EM13c Cloud Control.
- Dedicated Weblogic Server 12c.
- You must ensure that the Oracle WebLogic Server 12c Release 1 (12.1.3.0) installed by the Enterprise Manager Cloud Control Installation Wizard is dedicated for Enterprise Manager Cloud Control.
- You must not have any other Oracle Fusion Middleware product installed in that Middleware home.
- OEM 13c Cloud Control cannot coexist with any Oracle Fusion Middleware product in the same Middleware home because the ORACLE_COMMON property is used by both the products.
- As a prerequisite, you must have an existing Oracle Database {can also have the Automatic Memory Management (AMM) feature enabled} to configure the Management Repository.
- Manual Startup required for OMS and OMA.
- If you install the OMS and the Oracle Database, which houses the Management Repository, on the same host, then when you reboot the host, the OMS and the Management Agent installed with it will not automatically start up. You will have to manually start them.
I have listed few of the important ones, you can find detailed information in Oracle Documentation.
Hope this will help you setting up your new environment.
You can reach out to me on my personal email id: sharma.deepak345@gmail.com
Thanks
Deepak Sharma
Oracle EM DBA 