安装CDH在初始化CM数据库的时候出现mysql数据库连接的问题的解决方案

[2018-09-12 16:22:51,787]ERROR     0[main] - com.cloudera.enterprise.dbutil.DbProvisioner.executeSql(DbProvisioner.java) - Exception when creating/dropping database with user 'root' and jdbc url 'jdbc:mysql://10.100.200.40/?useUnicode=true&characterEncoding=UTF-8'
java.sql.SQLException: Access denied for user 'root'@'VM200-40' (using password: YES)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:996)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3887)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3823)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:870)
    at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:4332)
    at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1258)
    at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2234)
    at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2265)
    at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2064)
    at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:790)
    at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:44)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:377)
    at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:395)
    at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:325)
    at java.sql.DriverManager.getConnection(DriverManager.java:571)
    at java.sql.DriverManager.getConnection(DriverManager.java:215)
    at com.cloudera.enterprise.dbutil.DbProvisioner.executeSql(DbProvisioner.java:296)
    at com.cloudera.enterprise.dbutil.DbProvisioner.doMain(DbProvisioner.java:104)
    at com.cloudera.enterprise.dbutil.DbProvisioner.main(DbProvisioner.java:123)
[2018-09-12 16:22:51,792]ERROR     5[main] - com.cloudera.enterprise.dbutil.DbProvisioner.main(DbProvisioner.java) - Stack Trace:
java.sql.SQLException: Access denied for user 'root'@'VM200-40' (using password: YES)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:996)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3887)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3823)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:870)
    at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:4332)
    at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1258)
    at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2234)
    at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2265)
    at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2064)
    at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:790)
    at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:44)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:377)
    at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:395)
    at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:325)
    at java.sql.DriverManager.getConnection(DriverManager.java:571)
    at java.sql.DriverManager.getConnection(DriverManager.java:215)
    at com.cloudera.enterprise.dbutil.DbProvisioner.executeSql(DbProvisioner.java:296)
    at com.cloudera.enterprise.dbutil.DbProvisioner.doMain(DbProvisioner.java:104)
    at com.cloudera.enterprise.dbutil.DbProvisioner.main(DbProvisioner.java:123)

我们知道cm的数据库默认使用的是postgresql数据库，但是我们想存储CM上的相关组件的元数据信息我必须吧他存储在mysql这样的关系型数据库当中，所以我们要初始化数据库使用的是下面的命令。

/usr/share/cmf/schema/scm_prepare_database.sh mysql cm -h10.100.200.40 -uroot -proot --scm-host 10.100.200.40 scm scm scm
我采用的是mysql数据库存元数据。从上面的报错我们能看出来是权限的问题。但是那修改了了好多遍还是不管用。最后的解决方法是将原来的mysql的登录密码修改，或者更新操作即可解决问题。解决方法如下;

GRANT ALL PRIVILEGES ON *.* TO root@"%" IDENTIFIED BY "root";  给数据库赋予远程连接的权限。

update user set Password = password('root') where User='root'; 更新数据库的数据登录的密码。

select Host,User,Password  from user where User='root';  在这里我们可以查看root用户的主句名称，用户和密码

最后刷新一下数据库刚才修改的配置文件即可：
flush privileges;
这样在去执行上面命令就可以执行成功。我们会在数据库当中看到一个cm的数据库创建成功。

至此问题得到解决了。