Since SonarQube 4.2, technical users can be set. Technical users are authenticated against SonarQube's own database of users, rather than against any external tool (LDAP, Active Directory, Crowd, etc.).
Similarly, all accounts not flagged as local will be authenticated only against the external tool. By default
admin is a technical account. Technical accounts are configured in SONARQUBE_HOME/conf/sonar.properties in the
sonar.security.localUsers (default value = admin) property as a comma-separated list.