This isn't really going to answer the question, I know... but why are you using Redhat 7.2 in the first place?
That version of Redhat is... umm... seven years old now, and hasn't been updated in five or six years, I think. This means that the OS is insecure and if it is on the internet, it is probably compromised already.
Please update to a more recent version of linux, whether that be CentOS, Ubuntu, or Fedora.
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