anchor.diff:  Additionally _OpenNMS_ requires authentication to access the database and are described in this section.
   Initialize the database directory with
   
  -.Initialize the database directory
  +.Initialization of the _PostgreSQL_ database
   [source, shell]
   ----
   postgresql-setup initdb
   ----
   
  -.Start PostgreSQL service on system boot
  +.System startup configuration for PostgreSQL
   [source, shell]
   ----
   systemctl enable postgresql
   ----
   
  -.Start PostgreSQL database without rebooting the system
  +.Startup PostgreSQL database
   [source, shell]
   ----
   systemctl start postgresql
  
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: [[gi-install-opennms-yum-repo]]
  ==== Setup OpenNMS YUM repository
  
  .Installation of stable repository and GPG key
  [source, shell]
  ----
  rpm -Uvh http://yum.opennms.org/repofiles/opennms-repo-stable-rhel7.noarch.rpm
  