pg_upgrade help

Hi all,
I need help on pg_upgrade from 8.4 to 9.4 version. Appreciate urgent
response.
Installed both version and stopped it. Do i need to run both version or
only one 8.4 or 9.4 . Both should run on 50432 ?

-bash-4.2$ id
uid=26(postgres) gid=26(postgres) groups=26(postgres)
context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023

-bash-4.2$ export OLDCLUSTER=/var/ericsson/esm-data/postgresql-data --
8.4 data
-bash-4.2$ export NEWCLUSTER=/var/ericsson/esm-data/postgresql-data-9.4
-- 9.4 data

-bash-4.2$ /opt/rh/rh-postgresql94/root/usr/bin/pg_upgrade
--old-bindir=/usr/bin --new-bindir=/opt/rh/rh-postgresql94/root/usr/bin
--old-datadir=$OLDCLUSTER --new-datadir=$NEWCLUSTER

connection to database failed: could not connect to server: No such file
or directory
Is the server running locally and accepting
connections on Unix domain socket
"/var/run/postgresql/.s.PGSQL.50432"?

could not connect to old postmaster started with the command:
"/usr/bin/pg_ctl" -w -l "pg_upgrade_server.log" -D
"/var/ericsson/esm-data/postgresql-data" -o "-p 50432 -c autovacuum=off -c
autovacuum_freeze_max_age=2000000000 -c listen_addresses='' -c
unix_socket_permissions=0700" start
Failure, exiting

With Best Regards
Akshay
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