启动ambari服务失败，提示：

Waiting for server start…ERROR: Exiting with exit code -1.
REASON: Ambari Server java process has stopped. Please check the logs for more information.

查看日志：

tail -200 /var/log/ambari-server/ambari-server.log 

发现报错：java.sql.SQLException: Access denied for user ‘ambari’@‘master’ (using password: YES)

这是MySQL抛出的异常，意思是用户的访问被拒绝，可能是权限问题，我们在数据库中给用户授权：

grant all privileges on *.* to ambari@'localhost' identified by 'bigdata';

再次启动ambari服务

成功启动。