15 Installing Oracle Management Agent Using Shared Oracle Home Using nfsagentinstall Script

Hardware Requirements

Ensure that you meet the hard disk space and physical memory requirements as described in Appendix A, "Meeting Hardware Requirements".

Operating System Requirements

Ensure that you install the Management Agent only on certified operating systems as mentioned in My Oracle Support note 412431.1.

User and Operating System Group Requirement

Ensure that the destination host where you want to install the Management Agent has the appropriate users and operating system groups created.

For information about creating operating system groups and users, see Appendix C, "Creating Operating System Groups and Users Requirements".

Temporary Directory Space Requirements

Ensure that you allocate 400 MB of space for a temporary directory where the executables can be copied. For example, /tmp on UNIX hosts and c:\Temp on Microsoft Windows hosts.

Central Inventory Requirements

Ensure that you allocate 100 MB of space for the central inventory directory.

Also ensure that the central inventory directory is not on a shared file system. If it is already on a shared file system, then switch over to a non-shared file system by following the instructions outlined in My Oracle Support note 1092645.1.

EMSTATE Directory Requirements

Ensure that the installation base directory you specify is empty and has write permission.

Existing Management Agent Software Requirements

Ensure that you install a Management Agent (Master Agent) on the shared, mounted location.

To install a Management Agent on the shared, mounted location, you can use any of the other Management Agent Deployment methods described in this guide.

Existing Management Agent Status Requirements

Ensure that the existing Management Agent (Master Agent) on the shared, mounted location is shut down always and not used for monitoring any targets. This installation is purely for sharing the software binaries with the Shared Agents.

oraInst.loc Location Requirements

If the shared Management Agent is not the first Oracle product installation but its Oracle home is shared, then ensure that you verify the oraInst.loc location under the /etc directory.

If oraInst.loc and inventory_loc are located in the your home directory, then ensure that you change this entry point to a non-shared location. The oraInst.loc entry should look like this:

inventory_loc=/<any location other than the home directory>/oraInventory

inst_group=<group to which the user belongs>

Software Availability Requirements

Although the installation actually is done using a shared Oracle home of an installed Management Agent that might be running on a different host, the nfsagentinstall script uses some files that are available in the Management Agent software package. Therefore, you are expected to maintain a copy of the Management Agent software for the required platform on the OMS host.

By default, the software for Oracle Management Agent 11g Release 1 is available on the host where Oracle Management Service 11g Release 1 is running. Note that this Management Agent software is for the platform on which the OMS is running.

Therefore, if you want to install Oracle Management Agent 11g Release 1 on a platform that is the same as the one on which the OMS is running, then you already meet this prerequisite; you do not have to take any action.

However, if you want to install Oracle Management Agent 11g Release 1 on a platform that is different from the one on which the OMS is running, then ensure that you download the Management Agent software for that platform.

For more information about downloading the Management Agent software, see Procuring Oracle Management Agent Software.

Shared, Mounted Location Requirements

Ensure that the shared, mounted location is accessible from all destination hosts where you want to install additional Management Agents.

Destination Host Credentials Requirements

Ensure that the destination hosts have the same operating system credentials and file system structure, including the following:

• Same User names and Group names

• Same user identifiers (UID) and group identifiers (GUID)

/etc/hosts File Requirements

If the destination host and the host on which OMS is running belong to different network domains, then ensure that you update the /etc/hosts file on the destination host to add a line with the IP address of that host, the fully-qualified name of that host, and the short name of the host.

For example, if the fully-qualified host name is mypc.cn.company.com and the short name is mypc, then add the following line in the /etc/hosts file:

12.123.123.12 mypc.cn.company.com mypc

Installing User Requirements

If the central inventory owner and the user installing the Management Agent are different, then ensure that they are part of the same group.

Also ensure that the inventory owner and the group to which the owner belongs have read and write permissions on the inventory directory.

For example, if the inventory owner is user1, and user installing the Management Agent is user2, then ensure that user1 and user2 belong to the same group, and they have read and write access to the inventory.

Permission Requirements

• Ensure that you have read, write, and execute permissions on oraInventory on all remote hosts. If you do not have these permissions on the default inventory (typically at /etc/oraInst.loc) on any remote host, then you can specify the path to an alternative inventory location by using the -i <location> option in the Additional Parameters section.

  For information about oraInventory permissions, see What Is Oracle Inventory Directory?.

• Ensure that you have write permission on the Installation Base Directory and the temporary directory where the executables will be copied. For example, /tmp or c:\Temp

Oracle Inventory Location Requirements

Ensure that the Oracle Inventory (oraInventory) is not in a shared location. When you use the oraInst.loc file, ensure that the inventory location specified there is not pointing to a shared location. If it is, change it to a non-shared location.

SUDO Privilege Requirement

Ensure that you have SUDO privileges to run root.sh and /bin/sh (UNIX platforms only). You must specify the invoking user's password here.

To verify whether you have SUDO privileges to run these files, access the /etc/sudoers file and check whether you have a similar entry as shown below. If you do not see a similar entry, then add one.

<user> <hostname>=PASSWD: /home/em/agent11010/agent11g/root.sh, /bin/sh

SUDOERS File Configuration Requirements

Ensure that you configure /etc/sudoers file so that while running a command using SUDO, you are always prompted for a password.

If /etc/sudoers file is configured in such a way that SUDO never prompts for a password, then a directory with the host password as the title gets created in the invoking users home directory.

Default SSH Port Requirements

Ensure that the SSH daemon is running on the default port (that is, 22) on all the destination hosts.

If the port is a non-default port, that is, any port other than 22, then update the SSH_PORT property in the following file present in the OMS Instance Base:

<INSTANCE_HOME>/sysman/prov/resources/Paths.properties

PubkeyAuthentication Parameter Requirements

Ensure that the PubkeyAuthentication parameter is enabled in the sshd_config file.

To verify the value of this parameter, run the following command:

grep PubkeyAuthentication <SSH_Install_Location>/sshd_config

For example,

grep PubkeyAuthentication /etc/ssh/sshd_config

The result of this command must be Yes. If the result is No, then edit the sshd_config file, set the PubkeyAuthentication value to Yes, and restart the SSH daemon.