getting instance types
+--------------------------------------+------------------+------+------+-----------+-------+-----------+
| ID                                   | Name             |  RAM | Disk | Ephemeral | VCPUs | Is Public |
+--------------------------------------+------------------+------+------+-----------+-------+-----------+
| 170da9f3-28b1-4886-aacc-1a24004ab299 | spec.ycsb.4c4g   | 4096 |    0 |         0 |     4 | True      |
| 473a5e6b-e5c1-4361-ac4f-53226079f81e | spec.test.4c8g   | 8192 |    0 |         0 |     4 | True      |
| 48f0ac44-c08d-4226-ad5f-e45a21aee5a3 | spec.kmeans.4c4g | 4096 |    0 |         0 |     4 | True      |
| d1f6664f-c78e-4406-a41b-4e207b99e2b9 | spec.test.4c4g   | 4096 |    0 |         0 |     4 | True      |
+--------------------------------------+------------------+------+------+-----------+-------+-----------+
