server.xml
    <Resource name="jdbc/PatientPortalDataSource" auth="Container"
                type="javax.sql.DataSource" driverClassName="org.postgresql.Driver"
                url="jdbc:postgresql://localhost:5433/iemk"
                username="iehr" password="iehr"
                maxActive="10" maxIdle="5" maxWait="-1"/>

context.xml
    <ResourceLink name="jdbc/PatientPortalDataSource"
                  global="jdbc/PatientPortalDataSource"
                  type="javax.sql.DataSource"/>