Install OpenNMS with postgreSQL 9 on CentOS 5.5

1. yum install yum-fastestmirror
2. rpm -Uvh http://yum.opennms.org/repofiles/opennms-repo-stable-rhel5.noarch.rpm
3. wget http://www.pgrpms.org/9.0/redhat/rhel-5-x86_64/pgdg-centos-9.0-2.noarch.rpm
4. rpm -i pgdg-centos-9.0-2.noarch.rpm
5. yum install postgresql90-server postgresql90-devel
6. /etc/init.d/postgresql-9.0 initdb
7. vi /var/lib/pgsql/9.0/data/pg_hba.conf, to change ident to trust for all local, IPv4, and IPv6.
   
8. vi /var/lib/pgsql/9.0/data/postgresql.conf to modify work_mem, vacuum_cost_delay, wal_buffer, checkpoint_segment, etc to meet your need.
   
9. /etc/init.d/postgresql-9.0 restart
10. createdb -U postgres opennms
11. wget http://sourceforge.net/projects/opennms/files/IPLIKE/stable-2.0/iplike-2.0.0.tar.gz
12. tar xfz iplike-2.0.0.tar.gz
13. cd iplike-2.0.0
14. ./configure --with-pgsql=/usr/pgsql-9.0/bin/pg_config
15. make
16. make install
17. /usr/local/sbin/install_iplike.sh
18. psql -U postgres -h localhost -d opennms -c '\df+ iplike|head'
19. yum install opennms --nogpgcheck
20. /opt/opennms/bin/runjava -s
21. /opt/opennms/bin/install -dis
22. /etc/init.d/opennms start

The OpenNMS page is at http://localhost:8980/opennms/login.jsp. Both initial user name and password are admin.