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Since you're using virtual machines, though, have you enabled bridging on your network devices? If you haven't, you won't be able to communicate correctly.
And again, since you're using both Red Hat Enterprise and Oracle Enterprise, have you contacted Red Hat and/or Oracle support??? Those are both commercial products that you are PAYING for, and as such, are paying for tech support.
- Obviously i am going to share data between oracle databases.
Why would that be obvious? Oracle Linux is *TYPICALLY* used for Oracle, but can be used for other things as well
Still i did n't update etc /hosts file.
Well, if you think you have to, wouldn't it be a good idea to DO IT??
I googled but clear. from attached screen shot what's your suggestion to us ?
Since you don't say WHAT isn't clear, what do you think anyone can tell you? I suggested to you in my first reply that you enable bridging from your VM machines, and for you to contact either Red Hat or Oracle support. Have you done either? You don't say what kind of VM machine you're using, so again...with no details, there can't be much in the way of an answer.
Hello TBone ;
Small clarification. when i issuued
# hostname -i
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 oel5.myserver oel5 localhost.localdomain localhost
192.168.2.20 oel.myserver oel5
What's the problem here?
That doesn't clarify anything, since this is the first time you mentioned the /etc/hosts file, or issuing the hostname command. Why would this clarify anything? And you still haven't answered whether or not you've contacted Oracle/Red Hat, or what kind of VM's you're using, or if you've enabled bridging on your VM's yet. You got these suggestions, and haven't acknowledged them. Unless you answer questions and try things, there is little point in posting follow-ups.
And you have put incorrect entries in the /etc/hosts file. Again, you need to talk with your unix/linux folks and get them to explain things to you, or try looking up such things on your own. From very easily found /etc/hosts examples from Google: http://www.faqs.org/docs/securing/chap9sec95.html
Your localhost line is wrong, and you've defined two aliases for the SAME name...both for oel5.