As of CDH 5, Hive includes HCatalog, but you still need to install HCatalog separately if you want to use it; see Installing and Using HCatalog.
Install Hive on your client machine(s) from which you submit jobs; you do not need to install it on the nodes in your Hadoop cluster.
You need to deploy HiveServer2, an improved version of HiveServer that supports a Thrift API tailored for JDBC and ODBC clients, Kerberos authentication, and multi-client concurrency. The CLI for HiveServer2 is Beeline.
The original HiveServer and command-line interface (CLI) are no longer supported; use HiveServer2 and Beeline.