Access denied for user 'sonar'@'localhost' (using password: YES) - MySQL Errors installing SonarQube

Make sure you have setup user correctly in MySQL database and also correctly configured that user in sonar.properties.
 

mysql -u root -p

SHOW GLOBAL VARIABLES LIKE 'storage_engine’;

CREATE USER 'sonar'@'localhost' IDENTIFIED BY 'password';

CREATE DATABASE sonar;

GRANT ALL PRIVILEGES ON sonar.* TO 'sonar'@'localhost';

sudo vi /opt/sonarqube/conf/sonar.properties

#uncomment  the below lines

sonar.jdbc.username=sonar

sonar.jdbc.password=password

sonar.jdbc.url=jdbc:mysql://localhost:3306/sonar?useUnicode=true&characterEncoding=utf8&rewriteBatchedStatements=true&useConfigs=maxPerformance

now start the server 

sh /opt/sonarqube/bin/linux-x86-64/sonar.sh start

for any issues, look at logs at 

tail -f /opt/sonarqube/logs/sonar.log