On Fri, Jun 3, 2016 at 8:30 AM, Dennis <dennisr@visi.com> wrote: > Is it possible to execute command in on system the is hosting postgresql > remotely using psql or other mechanism? I know I can use \! in psql but > that executes the commands on the host where I am running psql from. Also, > is it possible for a postgres login/user to stop or restart a running > postgres instance from in side psql or similar client. e.g. psql -c “pg_ctl > stop -D some_data_dir”
Not directly. You could implement an extension that wraps a function available at SQL level taking some actions, however for the restart the error handling is tricky if you just have control via psql. How could you start a node that has been stopped during a restart but could not boot up. Take the example of an incorrect parameter value that has been added when the node was up via ALTER SYSTEM...
I was focused on admin task due to the pg_ctl (not sure you'd want to run that via psql...) but if you have shell script applications you want to run you could consider: