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upgrade PostgreSQL from version 8.4 to 9.4 On Centos

Upgrade Postgresql 8.4 to 9.4 in Centos
1. Yum Install PG9.4
2. wget http://yum.postgresql.org/9.4/redhat/rhel-6-x86_64/pgdg-redhat94-9.4-1.noarch.rpm
3. yum install pgdg-redhat94-9.4-1.noarch.rpm
4. yum install postgresql94-server
5. service postgresql-9.4 initdb
6. chkconfig postgresql-9.4 on
Backup Data
7. su - postgres
8. pg_dumpall > dump.sql
Restore Data
9. service postgresql stop
10. service postgresql-9.4 start
11. su - postgres
12. psql < dump.sql
Config Network Access
vi /var/lib/pgsql/9.4/data/postgresql.conf

 1. listen_addresses = '*'
 2. port = 5432

# "local" is for Unix domain socket connections only
local   all         all                               ident
# IPv4 local connections:
host    all         all          ident
host    all         all        md5
host    all         all        md5
# IPv6 local connections:
host    all         all         ::1/128               ident
Remove PG8.4
1. yum remove postgresql
 2. ln -s /usr/pgsql-9.4/bin/psql /usr/local/bin/psql


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