@kwanchai The error seems to indicate that postgres is not running.  If you can make sure that the postgres installed with the CDP is restarted and running then try again.   It is possible after reboot that is stuck in undesired state you see (shutting down).  Alternatively, redo the install and complete a shutdown of CDP completely before doing reboot and snapshot steps. ... View more

@kwanchai Welcome to the Cloudera Community! To help you get the best possible solution, I have tagged our Cloudera Manager expert @soychago  who may be able to assist you further. Please keep us updated on your post, and we hope you find a satisfactory solution to your query. ... View more