Обсуждение: postgres operational
Hi List, Is there a sure fire way to tell if postgres server is up an operational. I was testing to see if the socket at /tmp/.s.PGSQL.5432 existed - but I ran into a recent problem on CentOS 7.5, postgresql 9.2.24, where the socket was there but my script couldn't read from my database yet. Thanks, Steve --
The best way I came up with for older versions is: If timeout -s 9 10 psql -d DBNAME -c "select 1" >/dev/null ; then .... And on newer versions, use the pg_isready command. Scot Kreienkamp |Senior Systems Engineer | La-Z-Boy Corporate One La-Z-Boy Drive| Monroe, Michigan 48162 | Office: 734-384-6403 | | Mobile: 7349151444 | Email: Scot.Kreienkamp@la-z-boy.com > -----Original Message----- > From: Steve Clark [mailto:steve.clark@netwolves.com] > Sent: Wednesday, January 9, 2019 12:59 PM > To: pgsql <pgsql-general@postgresql.org> > Subject: postgres operational > > Hi List, > > Is there a sure fire way to tell if postgres server is up an operational. I was > testing to see if the > socket at /tmp/.s.PGSQL.5432 existed - but I ran into a recent problem on > CentOS 7.5, postgresql 9.2.24, where the > socket was there but my script couldn't read from my database yet. > > Thanks, > Steve > -- > This message is intended only for the individual or entity to which it is addressed. It may contain privileged, confidentialinformation which is exempt from disclosure under applicable laws. If you are not the intended recipient, youare strictly prohibited from disseminating or distributing this information (other than to the intended recipient) orcopying this information. If you have received this communication in error, please notify us immediately by e-mail orby telephone at the above number. Thank you.
El 9/1/19 a las 14:58, Steve Clark escribió: > Hi List, > > Is there a sure fire way to tell if postgres server is up an operational. I was testing to see if the > socket at /tmp/.s.PGSQL.5432 existed - but I ran into a recent problem on CentOS 7.5, postgresql 9.2.24, where the > socket was there but my script couldn't read from my database yet. Use `check_postgres` -- Martín Marqués http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services
On 1/9/19 12:19 PM, Martín Marqués wrote: > El 9/1/19 a las 14:58, Steve Clark escribió: >> Hi List, >> >> Is there a sure fire way to tell if postgres server is up an operational. I was testing to see if the >> socket at /tmp/.s.PGSQL.5432 existed - but I ran into a recent problem on CentOS 7.5, postgresql 9.2.24, where the >> socket was there but my script couldn't read from my database yet. > Use `check_postgres` Isn't "pg_ctl status" the canonical method? -- Angular momentum makes the world go 'round.
El 9/1/19 a las 17:38, Ron escribió: > On 1/9/19 12:19 PM, Martín Marqués wrote: >> El 9/1/19 a las 14:58, Steve Clark escribió: >>> Hi List, >>> >>> Is there a sure fire way to tell if postgres server is up an >>> operational. I was testing to see if the >>> socket at /tmp/.s.PGSQL.5432 existed - but I ran into a recent >>> problem on CentOS 7.5, postgresql 9.2.24, where the >>> socket was there but my script couldn't read from my database yet. >> Use `check_postgres` > > Isn't "pg_ctl status" the canonical method? Depends on what you are expecting. `check_postgres` has many different checks, one which will actually try to connect and run `SELECT 1` to make sure postgres can actually run a query. pg_ctl status might return ok, yet you can't connect for other reasons. -- Martín Marqués http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services