Run the commands below from the master node as gpadmin user in order to validate basic functionality of the Greenplum cluster.

1. Refresh the environment variables:

   $ source ~/.bashrc

2. Show the state of the Greenplum cluster:

   $ gpstate

3. Connect to the postgres database and check segment configuration information:

   $ psql postgres
   postgres=# SELECT * FROM gp_segment_configuration ORDER BY hostname;

4. Once connected to the postgres database, verify that you can create a table, insert data to it and read it:

   postgres=# CREATE TABLE t AS SELECT generate_series(1, 1000000);
   postgres=# SELECT MIN(cnt), MAX(cnt), COUNT(cnt) FROM (SELECT COUNT(*) cnt FROM t GROUP BY gp_segment_id) tt;
   postgres=# DROP TABLE t;