<title>Adjust authentication</title>

<para>

<command>pg_upgrade</> will connect to the old and new servers several times,

so you might want to set authentication to <literal>trust</>

or <literal>peer</> in <filename>pg_hba.conf</>, or if using

<literal>md5</> authentication, use a <filename>~/.pgpass</> file

<command>pg_upgrade</> will connect to the old and new servers several

times, so you might want to set authentication to <literal>peer</>

in <filename>pg_hba.conf</> or use a <filename>~/.pgpass</> file

(see <xref linkend="libpq-pgpass">).

</para>

</step>

<title>Restore <filename>pg_hba.conf</></title>

<para>

If you modified <filename>pg_hba.conf</> to use <literal>trust</>,

restore its original authentication settings. It might also be

necessary to adjust other configurations files in the new cluster to

match the old cluster, e.g. <filename>postgresql.conf</>.

If you modified <filename>pg_hba.conf</>, restore its original settings.

It might also be necessary to adjust other configuration files in the new

cluster to match the old cluster, e.g. <filename>postgresql.conf</>.

</para>

</step>