Message-ID: <542B48C5.6070507@2ndquadrant.com>
Date: Wed, 01 Oct 2014 09:20:21 +0900
From: Ian Barwick <ian@2ndquadrant.com>
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Subject: Re: How to detect if Postgres needs a restart when configuration
 changes
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On 14/10/01 8:51, Strahinja Kustudić wrote:
> I am automating Postgres deployment on Linux and I need to check if Postgres 
> needs to be restarted when a configuration parameter that requires a restart
> changes, e.g. when you change wal_level. Is there a way to detect a parameter
> which requires a restart was changed?
> 
> Reading the log file after sending SIGHUP is not possible to automate. I know
> I can query pg_settings and then compare relevant parameters from the conf file,
> but that means I will need to check all parameters which I set and which require a
> restart. I only need to know if postgres requires a restart.

I created an experimental background worker which records configuration parameter
changes after a SIGHUP is received:

  https://github.com/ibarwick/config_log

It was originally intended to log configuration changes, however it
might be possible to create a query based off the recorded values to detect
changes which require a restart.

No guarantee of fitness for purpose. Requires 9.3 or later.


Regards

Ian Barwick

-- 
 Ian Barwick                   http://www.2ndQuadrant.com/
 PostgreSQL Development, 24x7 Support, Training & Services


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