CDB & PDB LISTENER Files Configuration.

Here are the contents of my listener.ora file:

[oracle@CDB admin]$ cat listener.ora
# listener.ora Network Configuration File: /u01/app/oracle/product/12.1.0/dbhome_1/network/admin/listener.ora
# Generated by Oracle configuration tools.
#VALID_NODE_CHECKING_REGISTRATION_LISTENER=ON
#SSL_VERSION = 1.0
#USE_SID_AS_SERVICE_listener=on

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = CDB.oraclecloud)(PORT = 1521))
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
    )
  )

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (GLOBAL_DBNAME = CDB)
      (SID_NAME = CDB)
    )
    (SID_DESC =
      (GLOBAL_DBNAME = PDB1)
      (SID_NAME = PDB1)
    )
    (SID_DESC =
      (GLOBAL_DBNAME = PDB2)
      (SID_NAME = PDB2)
  )
 )

Following are the contents of my tnsnames.ora file:

[oracle@CDB admin]$ cat tnsnames.ora

# tnsnames.ora Network Configuration File: /u01/app/oracle/product/12.1.0/dbhome_1/network/admin/tnsnames.ora

# Generated by Oracle configuration tools.

CDB =

  (DESCRIPTION =

    (ADDRESS = (PROTOCOL = TCP)(HOST = CDB.oraclecloud)(PORT = 1521))

    (CONNECT_DATA =

      (SERVER = DEDICATED)

      (SERVICE_NAME = CDB)

    )

  )

PDB1 =

  (DESCRIPTION =

    (ADDRESS = (PROTOCOL = TCP)(HOST = CDB.oraclecloud)(PORT = 1521))

    (CONNECT_DATA =

      (SERVER = DEDICATED)

      (SERVICE_NAME = PDB1)

    )

  )

PDB2 =

  (DESCRIPTION =

    (ADDRESS = (PROTOCOL = TCP)(HOST = CDB.oraclecloud)(PORT = 1521))

    (CONNECT_DATA =

      (SERVER = DEDICATED)

      (SERVICE_NAME = PDB2)

    )

  )