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Commit85f9573

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Limit pg_upgrade authentication advice to always-secure techniques.
~/.pgpass is a sound choice everywhere, and "peer" authentication issafe on every platform it supports. Cease to recommend "trust"authentication, the safety of which is deeply configuration-specific.Back-patch to 9.0, where pg_upgrade was introduced.
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‎doc/src/sgml/pgupgrade.sgml

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@@ -288,10 +288,9 @@ make prefix=/usr/local/pgsql.new install
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<title>Adjust authentication</title>
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<para>
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<command>pg_upgrade</> will connect to the old and new servers several times,
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so you might want to set authentication to <literal>trust</>
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or <literal>peer</> in <filename>pg_hba.conf</>, or if using
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<literal>md5</> authentication, use a <filename>~/.pgpass</> file
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<command>pg_upgrade</> will connect to the old and new servers several
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times, so you might want to set authentication to <literal>peer</>
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in <filename>pg_hba.conf</> or use a <filename>~/.pgpass</> file
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(see <xref linkend="libpq-pgpass">).
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</para>
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</step>
@@ -406,10 +405,9 @@ pg_upgrade.exe
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<title>Restore <filename>pg_hba.conf</></title>
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<para>
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If you modified <filename>pg_hba.conf</> to use <literal>trust</>,
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restore its original authentication settings. It might also be
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necessary to adjust other configurations files in the new cluster to
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match the old cluster, e.g. <filename>postgresql.conf</>.
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If you modified <filename>pg_hba.conf</>, restore its original settings.
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It might also be necessary to adjust other configuration files in the new
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cluster to match the old cluster, e.g. <filename>postgresql.conf</>.
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</para>
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</step>
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