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 1gvnpy-00019u-Ar for pgsql-admin@arkaria.postgresql.org; Mon, 18 Feb 2019 18:40:18 +0000 Received: from localhost ([127.0.0.1] helo=malur.postgresql.org) by malur.postgresql.org with esmtp (Exim 4.89) (envelope-from ) id 1gvnpv-0001wh-HT for pgsql-admin@arkaria.postgresql.org; Mon, 18 Feb 2019 18:40:15 +0000 Received: from magus.postgresql.org ([2a02:c0:301:0:ffff::29]) by malur.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.89) (envelope-from ) id 1gvnpu-0001qq-So for pgsql-admin@lists.postgresql.org; Mon, 18 Feb 2019 18:40:15 +0000 Received: from mail-yw1-xc44.google.com ([2607:f8b0:4864:20::c44]) by magus.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.89) (envelope-from ) id 1gvnpn-0000Be-Iz for pgsql-admin@postgresql.org; Mon, 18 Feb 2019 18:40:14 +0000 Received: by mail-yw1-xc44.google.com with SMTP id x21so6789918ywx.11 for ; Mon, 18 Feb 2019 10:40:07 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=joeconway.com; s=google; h=subject:to:cc:references:from:openpgp:autocrypt:message-id:date :user-agent:mime-version:in-reply-to; bh=nsJeRJc3Rqhx9SxsXIZQdxMnIFNCm66D7oLr5iLd7aE=; b=q36cuLXKLu/Kw1ETWfQyP6ca4p3xPcwkzZQApCG3MdCq2cOn5+335vvTu9aVjv64Sq mAamtpbFsMhWN7DTbZ19ytankKNfWPnR8KIXR6/rta0z2RiJri/Xo6Ra4hfKOiGB+0Ws jMdn03HzR0fV3SyulfG1IRxcX7QdT/LWPo4G6+sFNPpEaTSrsxe2Vh4PWLuW3nm9fvKb VJQFB1lOKMhs9ngbupdrLIdM5vAUSqqhGT0+G+Zp1FlOeXZLlN6hK4hpp1hg6hlHg0vq sAnOfcq5K8L0w6WeIhRoRPcUQCTYMRN2HU/kGT4wrKtBQC593lN1S47g3XeEO+cz6ecr aVTQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:openpgp:autocrypt :message-id:date:user-agent:mime-version:in-reply-to; bh=nsJeRJc3Rqhx9SxsXIZQdxMnIFNCm66D7oLr5iLd7aE=; b=HsQHMaeXdLrCcFGgxKIfjtnRO0nA0kgCgzCE97ckdjWVbRMJMExAy1AbhYBljwb6f1 LuFHk9YLIsrforA+w/fxVpeed5yBK9oEJ4UYvJLJrNP1ffZJ9jzDLfyLuYiLTEEpOJgz nf9tmYqDWt2F4TvZj7pJaa5gwdhauEawpPIdhBE6JvRt1nNDJ6WDcyeQTQ9BMpt2KcfT YDp9+9nBROX1SlELB7QZ+Yc8iDy7OXlOrExjQkhsDl1t55hl7MOVBJJXKlDl6QpBMMWL AOzqE6MQCc28pBOtlLgnbYC63EK7PIqTNo8To1Yfzl4tq+MSXeJjwQozmhg5MrXYKW/W c3zw== X-Gm-Message-State: AHQUAubr3dzhzz19hWmteWiHTqwMON8tjgr4U3OzyKREyEy9KHSUa2mF o/uDLd2Zmbg1l6gJzGoc9Kb/4n6sPy0= X-Google-Smtp-Source: AHgI3Ib31ecLFKPyIeyiZ4c4431GufEdD3Zb56ijCRX2FWb3xcmRqiyAa46BOakBa8oMfHNDlYKsQA== X-Received: by 2002:a81:9215:: with SMTP id j21mr19890503ywg.5.1550515205059; Mon, 18 Feb 2019 10:40:05 -0800 (PST) Received: from [192.168.4.41] ([72.17.18.98]) by smtp.gmail.com with ESMTPSA id a72sm6241275ywh.42.2019.02.18.10.40.03 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 18 Feb 2019 10:40:03 -0800 (PST) Subject: Re: Unique cluster / instance identifier? To: Andrew Gierth , "S. Bob" Cc: pgsql-admin References: <92d53982-cf1d-ce3f-c541-60a252f85aef@quadratum-braccas.com> <87r2c5htm3.fsf@news-spur.riddles.org.uk> From: Joe Conway Openpgp: preference=signencrypt Autocrypt: addr=mail@joeconway.com; keydata= mQINBEpXMCsBEADDnXUQzjlyi/cX02Gtdy2CLcroE5CsC7DJKdOBDbfgn0kfiIYoV5JniG4l VyzZUodY8yUAagqLYolh0UkBzs9N+qkm7erde4ypw3jzVQ37BuzIvk3nMUbuDZDgxWqX+nVS sKc+BQ5BpzgCHg48leoRO2ohjvYnUhgH3j2rFZCzaj6qQ7mv+XoxOJmUlVQtG06Jwkk7Vu14 7U9nMMM6hyUKzVnmCphnlcMNo26UyVU70MwFfFJgcI0c5fpp8byN56eD6VJVnufO5WAuEhzE qcrSJR2FAlmM90GBY+6vP29twLDCHuSFvrnujNCx/BvCC/a3/gPvyAFp4JtMm9eXAmq3m/Kw 94nTJXVdcbQeQQDp3KIG7MmWS4lnGvPn8v0CjgNaLvZXFLo1FgmUVsyEq1Lww4iRLa6sbpXJ ESx15UEue1k1YZM9C+4F/o3aeKNsAienjw2EXFzcaxIg/C4P493VMi3Qa8ycVxR5iYhUbYdo DFIUQhbFNsYfrtW/qZAELT3FCYFpZYG01e9Hj+cBrXXgyDDkQ5Lq4mlvmkRvuxn61V6Au4HA 0sJiCox5pM1FvzT+aI8HY1BYaiB9Pl4fhpKgmhhlSuglk9v39S4jmlUIb45iLAUVpeNM6Qjm 69pf5da9sm4aGFa7YlDSKf/WcU7z9ITZxsilOi2n7YJiwG7kTQARAQABtB9Kb2UgQ29ud2F5 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List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Precedence: bulk This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --O5a9o2B0RrQQZfgsd8ozw6HzJSRcv6wpd Content-Type: multipart/mixed; boundary="hR8UN2Gno6VNhD8gHcAviTG9JYxDOJ0BR"; protected-headers="v1" From: Joe Conway To: Andrew Gierth , "S. Bob" Cc: pgsql-admin Message-ID: Subject: Re: Unique cluster / instance identifier? References: <92d53982-cf1d-ce3f-c541-60a252f85aef@quadratum-braccas.com> <87r2c5htm3.fsf@news-spur.riddles.org.uk> In-Reply-To: <87r2c5htm3.fsf@news-spur.riddles.org.uk> --hR8UN2Gno6VNhD8gHcAviTG9JYxDOJ0BR Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 2/18/19 1:03 PM, Andrew Gierth wrote: >>>>>> "S" =3D=3D S Bob writes: >=20 > S> Hi all; >=20 > S> Does PostgreSQL store a unique cluster or instance identifier that > S> we can access to identify our instances? >=20 > Yes. But it's not easy to get at: it's the "Database system identifier"= > shown in the output of pg_controldata. (pg12+ will have a function to > get it from SQL, but released versions don't.) Umm, that function has been there since pg 9.6 select left(version(),17), system_identifier from pg_control_system(); left | system_identifier -------------------+--------------------- PostgreSQL 9.6.11 | 6320270156373568679 (1 row) Joe --=20 Crunchy Data - http://crunchydata.com PostgreSQL Support for Secure Enterprises Consulting, Training, & Open Source Development --hR8UN2Gno6VNhD8gHcAviTG9JYxDOJ0BR-- --O5a9o2B0RrQQZfgsd8ozw6HzJSRcv6wpd Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIcBAEBCAAGBQJcavwCAAoJEDfy90M199hlNvoP+gJMhpmpf3WXr74OuFyyR4Wk nnrkn/NBvOCxj4CkiJL1fbmLjF3H9YLxmJBqdfJsOZyradk1Gs/2Lly790uZp169 QVPWEtf+i2SfiK840l+64UaBOzouzBY0WrytqEOG+q6Hhnk9rC0kTKZa3qqmR+RD 9mHzrUEvMi9ydt65WyfIRI+As/fVdHrrRhfC8pnf5mcpv13rRaDhuuQ/mOuk4ACJ AobVQ/SHZrwcY6sYLg7k4Eq6R2GsA69BcQhYRynWBbs5mocBkFXZ1I6kl6BT3AyY bHxmmdWl3PbaP1uN6PwmH+a+sarkH8kC1z2mUbQqNdVlWuHthd1Hrv995iICsOVt cNVtx6XrOQ7lnCaOgydTqF0l9WMXdi7ZM4r/CHedsniEsPNBPaURR13Riv3j63Lr QS/GtnehIxhfjFw/iNK3ayhebdp9GkZgvHwMGC3/BaOfqrSjX8ANzODokTW8XaN+ T2KOKpVMedTVhRCNXS1oivqBsoIbjWkR+YURwKuUpJBk4zsxVjj37gW5WynN6eow bC0PgVqFwANAZS1pxfZTJlLmrlZ4JSh0H+ZfuQSUM7M9EzHX69mDgKulwsa5qzOS 0hst0+bFGqJFwGoNkmgdLSNBhEXYW4RoxaHPWdr6rlcjCFSV8TC6yFpSJGWxUFoj QAJWPos1vhgkhIc5LQqx =9Krf -----END PGP SIGNATURE----- --O5a9o2B0RrQQZfgsd8ozw6HzJSRcv6wpd--