Unable to start instance in Oracle Cloud using Linux

User_WLFD7

Has anyone seen anything like this using Oracle Cloud Infrastructure Linux command line?

$ sqlplus / as sysdba

SQL*Plus: Release 12.2.0.1.0 Production on Tue Oct 29 15:38:36 2019

Copyright (c) 1982, 2016, Oracle.  All rights reserved.

Connected.

SQL> startup

ORA-01012: not logged on

Process ID: 0

Session ID: 0 Serial number: 0

The instance shows its processes are running. However, I am unable to login.  I am unable to start the database. 

user967039

Did you set your ORACLE_SID and ORACLE_HOME or invoked the profile properly ?

Check if SID and Oracle_home is set properly.