I'm installing Oracle 11.2 on dedicated hosted server (centOS 5.5). I've gone through the Oracle Quick Installation guide diligently. I believe I've set everything up correctly, although I'm not a DBA and this is my first time doing such a thing. I'm at the point where I've started the Oracle Installer, and made it step 8 of 11, which is the Prerequisite Checks for "typical" install. I'm getting many errors here, they all point to the same thing (e.g. can't access node). Here's the first error, which is for physical memory:
Physical Memory - This is a prerequisite condition to test whether the system has at least 1GB (1048576.0KB) of total physical memory.
List of errors:
- PRVF-7531 : Physical memory check cannot be performed on node "host2" - Cause: Could not perform check of physical memory on the node indicated. - Action: Ensure ability to access the node specified and view memory information.
My hosted server has address of www.host2.domainname.com.
UPDATE1: I've observed that the oracle user cannot ping its own server:
oracle@host2 [~]# ping host2 ping: icmp open socket: Operation not permitted
The root user can ping host2.
Is there some way I can change permissions/etc. to enable oracle user to ping the server? (I'm assuming this is a sympton of the problem, but let me know if I'm on the wrong track here).
UPDATE2: (is anyone reading this?) I've learned that to make the oracle user able to ping, I can adjust the permissions of the /bin/ping file from
-rwxr-xr-x, to -rwsr-xr-x
However, there are various places that strongly warn against doing this, such as:
I haven't changed this permission, not sure if this is the right approach. I'm thinking that the oracle installation instructions are very detailed, and if this was needed, it would be documented to do so. Any oracle experts out there that can offer any advice?
UPDATE 3: I suspect the "server hardening" performed by the hosting company upon provisioning the server has had some effect on the Oracle database installation process, resulting in this error. I implemented chmod 4755 /bin/ping, as well as chmod 4755 /bin/ping6 (logged in as root). I verified that the oracle user can successfully ping host2 now. Then, I ran the Oracle universal installer. The same thing happened -- all of the pre-requisite checks fail (every one of them for the same reason stated above, cannot connect to node: host2). In desperation, I selected "Ignore All" checkbox, and continued the installation. Hey, the install completed successfully! The database runs OK from an initial check.
I have no idea if changing permissions on the ping and ping6 files were necessary or useful here (e.g. I didn't try to complete the install before changing their permissions, so I don't know if this was actually needed; of course I'm reluctant to revert them back in case things break). Are there any experienced Oracle users that can comment/advise on whether I need the /bin/ping file to be -rwsr-xr-x, or can I change back to -rwxr-xr-x?
Also, the list of server hardening is here:
I'd be interested if anyone has an opinion if any of these hardening rules will impact the use of Oracle database. So far, I've found a workaround for limited permissions for the /tmp directory, which allowed me to complete the installation (but doesn't exist thereafter). Does Oracle db need /tmp directory thereafter? etc.