1. Install CDH and report an error
CDH is the abbreviation of Cloudera Distribution for
Hadoop, which is a set of enterprise-oriented open source Hadoop ecosystem solutions provided by Cloudera. CDH integrates various Hadoop-related open source projects and tools, and provides functions for centralized management and operation of these components.
Install CDH and execute scm_prepare_database.sh to report an error, java.sql.SQLException: Access denied for user 'scm'@'localhost'
/opt/cloudera/cm/schema/scm_prepare_database.sh mysql scm scm 123456
JAVA_HOME=/usr/lib/jvm/jre-openjdk Verifying that we can write to
/etc/cloudera-scm-server Creating SCM configuration file in
/etc/cloudera-scm-server Executing: /usr/lib/jvm/jre-openjdk/bin/java
-cp /usr/share/java/mysql-connector-java.jar:/usr/share/java/oracle-connector-java.jar:/usr/share/java/postgresql-connector-java.jar:/opt/cloudera/cm/schema/…/lib/*
com.cloudera.enterprise.dbutil.DbCommandExecutor
/etc/cloudera-scm-server/db.properties com.cloudera.cmf.db. Tue Jul 18
20:35:55 CST 2023 WARN: Establishing SSL connection without server’s
identity verification is not recommended. According to MySQL 5.5.45+,
5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn’t set. For compliance with existing
applications not using SSL the verifyServerCertificate property is set
to ‘false’. You need either to explicitly disable SSL by setting
useSSL=false, or set useSSL=true and provide truststore for server
certificate verification. [ main]
DbCommandExecutor INFO Unable to login using supplied
username/password. [ main] DbCommandExecutor
ERROR Error when connecting to database. java.sql.SQLException: Access
denied for user ‘scm’@‘localhost’ (using password: YES) at
com.mysql.jdbc.SQLError.createSQLException(SQLError.java:965)[mysql-connector-java.jar:5.1.49]
at
com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3933)[mysql-connector-java.jar:5.1.49]
at
com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3869)[mysql-connector-java.jar:5.1.49]
at
com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:864)[mysql-connector-java.jar:5.1.49]
at
com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1707)[mysql-connector-java.jar:5.1.49]
at
com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1217)[mysql-connector-java.jar:5.1.49]
at
com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2189)[mysql-connector-java.jar:5.1.49]
at
com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2220)[mysql-connector-java.jar:5.1.49]
at
com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2015)[mysql-connector-java.jar:5.1.49]
at
com.mysql.jdbc.ConnectionImpl.(ConnectionImpl.java:768)[mysql-connector-java.jar:5.1.49]
at
com.mysql.jdbc.JDBC4Connection.(JDBC4Connection.java:47)[mysql-connector-java.jar:5.1.49]
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method)[:1.8.0_262] at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)[:1.8.0_262]
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)[:1.8.0_262]
at
java.lang.reflect.Constructor.newInstance(Constructor.java:423)[:1.8.0_262]
at
com.mysql.jdbc.Util.handleNewInstance(Util.java:403)[mysql-connector-java.jar:5.1.49]
at
com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:385)[mysql-connector-java.jar:5.1.49]
at
com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:323)[mysql-connector-java.jar:5.1.49]
at
java.sql.DriverManager.getConnection(DriverManager.java:664)[:1.8.0_262]
at
java.sql.DriverManager.getConnection(DriverManager.java:247)[:1.8.0_262]
at
com.cloudera.enterprise.dbutil.DbCommandExecutor.testDbConnection(DbCommandExecutor.java:263)[db-common-6.3.1.96818eaab0a222aa84a7854b8d22c0c7.jar:]
at
com.cloudera.enterprise.dbutil.DbCommandExecutor.main(DbCommandExecutor.java:139)[db-common-6.3.1.96818eaab0a222aa84a7854b8d22c0c7.jar:]
[ main] DbCommandExecutor ERROR
Exiting with exit code 8
–> Error 8, giving up (use --force if you wish to ignore the error)
查看一下配置文件
```powershell
cat /etc/cloudera-scm-server/db.properties
Auto-generated by scm_prepare_database.sh on 2023年 07月 18日 星期二 20:35:55 CST
#
For information describing how to configure the Cloudera Manager Server
to connect to databases, see the "Cloudera Manager Installation Guide."
#
com.cloudera.cmf.db.type=mysql
com.cloudera.cmf.db.host=localhost
com.cloudera.cmf.db.name=scm
com.cloudera.cmf.db.user=scm
com.cloudera.cmf.db.setupType=EXTERNAL
com.cloudera.cmf.db.password=123456
Login to MySQL
mysql -h 127.0.0.1 -P 3306 -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 3
Server version: 5.7.42 MySQL Community Server (GPL)
Copyright (c) 2000, 2023, Oracle and/or its affiliates.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
Granted permission
mysql> grant all privileges on . to ‘root’ @‘%’ identified by ‘123456’;
Query OK, 0 rows affected, 1 warning (0.00 sec)
mysql> grant all on scm. to ‘scm’@‘%’ identified by ‘123456’;*
Query OK, 0 rows affected, 1 warning (0.01 sec)
mysql> exit;
Bye
Re-execute scm_prepare_database.sh
/opt/cloudera/cm/schema/scm_prepare_database.sh mysql scm scm 123456
Solve the problem
JAVA_HOME=/usr/lib/jvm/jre-openjdk
Verifying that we can write to /etc/cloudera-scm-server
Creating SCM configuration file in /etc/cloudera-scm-server
Executing: /usr/lib/jvm/jre-openjdk/bin/java -cp /usr/share/java/mysql-connector-java.jar:/usr/share/java/oracle-connector-java.jar:/usr/share/java/postgresql-connector-java.jar:/opt/cloudera/cm/schema/../lib/* com.cloudera.enterprise.dbutil.DbCommandExecutor /etc/cloudera-scm-server/db.properties com.cloudera.cmf.db.
Tue Jul 18 17:01:34 CST 2023 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.
[ main] DbCommandExecutor INFO Successfully connected to database.
All done, your SCM database is configured correctly!