But it appears that the fail condition for "watchdog" is the failure of a pgpool-II instance. In the configuration described in the wiki you would put a pgpool-II instance on each Postgres node, and if one of the pgpool-II instances fails it executes a script (which can create the trigger file to promote the standby to master). However, if the fail condition for watchdog is a failure of the pgpool-II instance what happens if the DBMS has availability issues but the pgpool-II process on that server is ok? The fail condition would never be triggered, right?
*Will J. Dunn* *willjdunn.com <http://willjdunn.com>* On Tue, Jul 21, 2015 at 4:27 PM, Joshua D. Drake <j...@commandprompt.com> wrote: > > On 07/21/2015 01:21 PM, William Dunn wrote: > >> That's pretty cool! But the intended use of watchdog is so you can have >> multiple pgpool-II instances and failover among them >> (http://www.pgpool.net/docs/latest/pgpool-en.html#watchdog) rather than >> failure of Postgres. In the configuration described in that wiki what >> happens when the DBMS goes down but pgpool-II is fine? The watchdog >> appears to be monitoring the pgpool-II process, not the >> postgres/postmaster process. >> > > From what I see, it has the ability to execute a command/script based on a > failed condition which could include but not be limited to a command to > fail over a standby. > > > JD > > -- > Command Prompt, Inc. - http://www.commandprompt.com/ 503-667-4564 > PostgreSQL Centered full stack support, consulting and development. > Announcing "I'm offended" is basically telling the world you can't > control your own emotions, so everyone else should do it for you. >
