Re: [GENERAL] Lightest way of checking if postgresql is running at the other end of an ssh tunnel?
On Wed, May 11, 2016 at 02:28:47PM +0200, Vik Fearing wrote: > >> We have an ssh connection running from one server to our > >> postgresql database on another server. Some times we > >> experience that the ssh tunnel does not work anymore and > >> needs to be restarted, even though we use the autossh > >> package. I would like to write a script that “pings” > >> postgresql on the specified port, to check if the connection > >> goes through. I have tried with netcat, but it does not > >> really check if postgresql is in the other end of the tunnel, > >> it only check if there is as service (the tunnel) listing on > >> the port on the local machine. Is there another way of > >> pinging the port, to see if postgresql is alive at the other > >> end? If possible, I would like to NOT actually establishing a > >> connection to postgresql like if i used psql -c “select 1;”, > >> to avoid connection overhead. > > > > This > > > > http://www.postgresql.org/docs/devel/static/libpq-connect.html > > > > talks about ping functionality. Maybe you can use a tiny > > custom piece of code ? > > That tiny custom piece of code would be this: > > http://www.postgresql.org/docs/current/static/app-pg-isready.html That's what I had in mind :-) Thanks, Karsten -- GPG key ID E4071346 @ eu.pool.sks-keyservers.net E167 67FD A291 2BEA 73BD 4537 78B9 A9F9 E407 1346 -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
Re: [GENERAL] Lightest way of checking if postgresql is running at the other end of an ssh tunnel?
On 05/11/2016 11:41 AM, Karsten Hilbert wrote: > On Wed, May 11, 2016 at 11:17:54AM +0200, Niels Kristian Schjødt wrote: > >> We have an ssh connection running from one server to our >> postgresql database on another server. Some times we >> experience that the ssh tunnel does not work anymore and >> needs to be restarted, even though we use the autossh >> package. I would like to write a script that “pings” >> postgresql on the specified port, to check if the connection >> goes through. I have tried with netcat, but it does not >> really check if postgresql is in the other end of the tunnel, >> it only check if there is as service (the tunnel) listing on >> the port on the local machine. Is there another way of >> pinging the port, to see if postgresql is alive at the other >> end? If possible, I would like to NOT actually establishing a >> connection to postgresql like if i used psql -c “select 1;”, >> to avoid connection overhead. > > This > > http://www.postgresql.org/docs/devel/static/libpq-connect.html > > talks about ping functionality. Maybe you can use a tiny > custom piece of code ? That tiny custom piece of code would be this: http://www.postgresql.org/docs/current/static/app-pg-isready.html -- Vik Fearing +33 6 46 75 15 36 http://2ndQuadrant.fr PostgreSQL : Expertise, Formation et Support -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
Re: [GENERAL] Lightest way of checking if postgresql is running at the other end of an ssh tunnel?
On Wed, May 11, 2016 at 11:17:54AM +0200, Niels Kristian Schjødt wrote: > We have an ssh connection running from one server to our > postgresql database on another server. Some times we > experience that the ssh tunnel does not work anymore and > needs to be restarted, even though we use the autossh > package. I would like to write a script that “pings” > postgresql on the specified port, to check if the connection > goes through. I have tried with netcat, but it does not > really check if postgresql is in the other end of the tunnel, > it only check if there is as service (the tunnel) listing on > the port on the local machine. Is there another way of > pinging the port, to see if postgresql is alive at the other > end? If possible, I would like to NOT actually establishing a > connection to postgresql like if i used psql -c “select 1;”, > to avoid connection overhead. This http://www.postgresql.org/docs/devel/static/libpq-connect.html talks about ping functionality. Maybe you can use a tiny custom piece of code ? Karsten -- GPG key ID E4071346 @ eu.pool.sks-keyservers.net E167 67FD A291 2BEA 73BD 4537 78B9 A9F9 E407 1346 -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
[GENERAL] Lightest way of checking if postgresql is running at the other end of an ssh tunnel?
Hi, We have an ssh connection running from one server to our postgresql database on another server. Some times we experience that the ssh tunnel does not work anymore and needs to be restarted, even though we use the autossh package. I would like to write a script that “pings” postgresql on the specified port, to check if the connection goes through. I have tried with netcat, but it does not really check if postgresql is in the other end of the tunnel, it only check if there is as service (the tunnel) listing on the port on the local machine. Is there another way of pinging the port, to see if postgresql is alive at the other end? If possible, I would like to NOT actually establishing a connection to postgresql like if i used psql -c “select 1;”, to avoid connection overhead. Any ideas? -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
