anchor.diff:  This section describes how to install the _OpenNMS_ platform on _CentOS 7.1_.
   The setup process is described in the following steps:
   
  -. Install OpenNMS YUM repository server with GPG key to verify packages
  +. Install _OpenNMS_ _YUM_ repository server with GPG key to verify packages
   . Installation of the _opennms_ meta package which handles all dependencies
   . Initialize _PostgreSQL_ database and configure access
   . Initialize _OpenNMS_ and first start of the application
  
positive.code: 
  The next step is creating an _opennms_ database user with password and configure the authentication method.
  
  .Create database user _opennms_ and a database _opennms_ with the owner of the created user.
  [source, shell]
  ----
  su - postgres
  
negative.code: createdb -O opennms opennms
  ----
  
  [source, shell]
  ----
  vi /var/lib/pgsql/data/pg_hba.conf
  ----
  
  .Configuration of network access for _PostgreSQL_
  [source, shell]
  ----
  host    all             all             127.0.0.1/32            md5<1>
  host    all             all             ::1/128                 md5<1>
  ----
  
  <1> Change method from `ident` to `md5` for _IPv4_ and _IPv6_ on localhost.
  
  .Apply configuration changes for _PostgreSQL_
  [source, shell]
  ----
  systemctl reload postgresql
  ----
  
  [source, shell]
  ----
  vi ${OPENNMS_HOME}/etc/opennms-datasource.xml
  ----
  
  .Configuration for database authentication in _OpenNMS_
  [source, xml]
  ----
  <jdbc-data-source name="opennms"
                      database-name="opennms"
                      class-name="org.postgresql.Driver"
                      url="jdbc:postgresql://localhost:5432/opennms"
                      user-name="** YOUR-OPENNMS-USERNAME **"<1> 
                      password="** YOUR-OPENNMS-PASSWORD **" /><2>
  
  <jdbc-data-source name="opennms-admin"
                      database-name="template1"
                      class-name="org.postgresql.Driver"
                      url="jdbc:postgresql://localhost:5432/template1"
                      user-name="** YOUR-OPENNMS-USERNAME **"<3>
                      password="** YOUR-OPENNMS-PASSWORD **" /><4>
  ----
  
  <1> Set the user name to access the _OpenNMS_ database table
  <2> Set the password to access the _OpenNMS_ database table
  <3> Set the user name for administrative changes of the _OpenNMS_ database table
  <4> Set the password for administrative changes of the _OpenNMS_ database table
  
  [[gi-install-opennms-rhel-init]]
  ==== Initialize OpenNMS
  