Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.89) (envelope-from ) id 1gLw6K-0002LY-8h for pgsql-admin@arkaria.postgresql.org; Sun, 11 Nov 2018 20:12:56 +0000 Received: from localhost ([127.0.0.1] helo=malur.postgresql.org) by malur.postgresql.org with esmtp (Exim 4.89) (envelope-from ) id 1gLw6I-000762-GU for pgsql-admin@arkaria.postgresql.org; Sun, 11 Nov 2018 20:12:54 +0000 Received: from makus.postgresql.org ([2001:4800:3e1:1::229]) by malur.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.89) (envelope-from ) id 1gLw6I-00075A-5T for pgsql-admin@lists.postgresql.org; Sun, 11 Nov 2018 20:12:54 +0000 Received: from out5-smtp.messagingengine.com ([66.111.4.29]) by makus.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.89) (envelope-from ) id 1gLw6B-0004mg-RL for pgsql-admin@postgresql.org; Sun, 11 Nov 2018 20:12:52 +0000 Received: from compute7.internal (compute7.nyi.internal [10.202.2.47]) by mailout.nyi.internal (Postfix) with ESMTP id EAC6720A0D; Sun, 11 Nov 2018 15:12:46 -0500 (EST) Received: from mailfrontend1 ([10.202.2.162]) by compute7.internal (MEProxy); Sun, 11 Nov 2018 15:12:46 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=content-transfer-encoding:content-type :date:from:in-reply-to:message-id:mime-version:references :subject:to:x-me-proxy:x-me-proxy:x-me-sender:x-me-sender :x-sasl-enc; s=fm1; bh=F8+9IUeAjyB7tjxCjH1JMgqz4s+yr+ExNAAUaXQxO YA=; b=pFkAbsBfKQdCuiE51T0LJ3r5CpXUHREgKD+o/XTNKqk39wQ/SwhN6+akZ WgO5F+TqN8XBUOZablRQlOnYkhluv/dpwGb6FDEHIMg7q1OffkJ/vh4x6m8rHxNH dvUOMuWhhxdtH70QA1zVjFnRQLaCPzcHEiIq04BMC/aDo5gh24sr1tCFFnZH7Uil 8cDa5lUf+f4jr4jcsXryqtn8pLrE+NJYvanAN0JezdPFaK9gVEkXwxYzXPTi4ps2 fBQvEhOYlSl0s04t7FlH+4e7XYqVjcWAje5HhwcOBWhlbfd4N9NGUKm0MwFocukO Ig3oEVX5O8fkWKXRPVfL6tq2tRixA== X-ME-Sender: X-ME-Proxy: Received: from april.pezone.net (p5df295f3.dip0.t-ipconnect.de [93.242.149.243]) by mail.messagingengine.com (Postfix) with ESMTPA id 3536DE4619; Sun, 11 Nov 2018 15:12:46 -0500 (EST) Subject: Re: How to downgrade a cluster from 9.5 to 9.3 To: Michael Lupo , pgsql-admin@postgresql.org References: <1541863545162-0.post@n3.nabble.com> From: Peter Eisentraut Openpgp: preference=signencrypt Autocrypt: addr=peter.eisentraut@2ndquadrant.com; 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Intel Mac OS X 10.13; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <1541863545162-0.post@n3.nabble.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Precedence: bulk On 10/11/2018 16:25, Michael Lupo wrote: > Hello all. My first post. > > I have a ubuntu machine that was originally running postgres 9.3. I > installed 9.5 on that machine as well and then performed a pg_upgradecluster > -v 9.5. 9.3 main. > This procedure successfully moved my data from the running 9.3/main cluster, > to the 9.5/main cluster, brought down the 9.3 running instance and then > brought the 9.5 instance online utilizing the default ports. This was neat > to see happen. > > As a back out plan, I need to know how to restore the 9.3 running instance > if for some reason the data got corrupted in the update to 9.5. You should be able to just shut down the 9.5 instance, switch back the port numbers, and start the 9.3 instance. Note that pg_upgradecluster by default uses the pg_dump method, so it's unlikely that anything will get "corrupted" during the upgrade. It's a more interesting consideration if you use the pg_upgrade method. -- Peter Eisentraut http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services