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<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am planning to upgrade our current Postgres 9.4.9 to 9.6 version using pg_upgrade method to reduce Production downtime. I followed below steps so far,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>Postgres 9.4.9 running on 5432 port.<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>Same server, installed Postgres 9.6, its running fine on 5433 port.<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>Stop both the Postgres services through pg_ctrlcluster method.<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>Running below command to upgrade server.<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2 lfo1">
<![if !supportLists]><span style="font-family:"Courier New""><span style="mso-list:Ignore">o<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>sudo -H -u postgres /usr/lib/postgresql/9.6/bin/pg_upgrade -b /usr/lib/postgresql/9.4/bin -B /usr/lib/postgresql/9.6/bin -d /var/lib/postgresql/9.4/main -D /var/lib/postgresql/9.6/main -o '-c config_file=/etc/postgresql/9.4/main/postgresql.conf'
-o '-c config_file=/etc/postgresql/9.6/main/postgresql.conf'<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><o:p> </o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>I am getting below error while executing above command:<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:1.0in"><b><i>command: "/usr/lib/postgresql/9.4/bin/pg_ctl" -w -l "pg_upgrade_server.log" -D "/var/lib/postgresql/9.4/main" -o "-p 50432 -b -c config_file=/etc/postgresql/9.4/main/postgresql.conf -c config_file=/etc/postgresql/9.6/main/postgresql.conf
-c listen_addresses='' -c unix_socket_permissions=0700 -c unix_socket_directories='/tmp'" start >> "pg_upgrade_server.log" 2>&1<o:p></o:p></i></b></p>
<p class="MsoListParagraph" style="margin-left:1.0in"><b><i>waiting for server to start....2016-10-18 22:11:30 UTC [13107-1] FATAL: database files are incompatible with server<o:p></o:p></i></b></p>
<p class="MsoListParagraph" style="margin-left:1.0in"><b><i>2016-10-18 22:11:30 UTC [13107-2] DETAIL: The data directory was initialized by PostgreSQL version 9.6, which is not compatible with this version 9.4.9.<o:p></o:p></i></b></p>
<p class="MsoListParagraph" style="margin-left:1.0in"><b><i>stopped waiting<o:p></o:p></i></b></p>
<p class="MsoListParagraph" style="margin-left:1.0in"><b><i>pg_ctl: could not start server<o:p></o:p></i></b></p>
<p class="MsoListParagraph" style="margin-left:1.0in"><b><i>Examine the log output.<o:p></o:p></i></b></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Is it possible to upgrade Postgres 9.4.9 to 9.6 with pg_upgrade option or I need to do it through pg_dump only? Any help would be appreciated.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><i><span style="color:black">Thanks,</span></i></b><span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><b><i><span style="color:black">Ashish Chauhan</span></i></b><span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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