Re: Postgres upgrade from 9.4.9 to 9.6 using pg_upgrade error

On Tue, Oct 18, 2016 at 10:15:47PM +0000, Ashish Chauhan wrote:
> ·         I am getting below error while executing above command:
>
> 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
>
> waiting for server to start....2016-10-18 22:11:30 UTC [13107-1] FATAL:
> database files are incompatible with server
>
> 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.
>
> stopped waiting
>
> pg_ctl: could not start server
>
> Examine the log output.
>
>
>
> 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.

It should work.  I think you haven't follow the cluster initialization
instructions properly and installed the wrong version somewhere.

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