[root@master ~]# sudo /opt/cloudera/cm/schema/scm_prepare_database.sh mysql scm scm
Enter SCM password:
JAVA_HOME=/usr/java/jdk1.8.0_181-cloudera
Verifying that we can write to /etc/cloudera-scm-server
Creating SCM configuration file in /etc/cloudera-scm-server
Executing: /usr/java/jdk1.8.0_181-cloudera/bin/java -cp :/opt/cloudera/cm/schema/../lib/* com.cloudera.enterprise.dbutil.DbCommandExecutor /etc/cloudera-scm-server/db.properties com.cloudera.cmf.db.
[ main] DbCommandExecutor INFO Unable to find JDBC driver for database type: MySQL
[ main] DbCommandExecutor ERROR JDBC Driver com.mysql.jdbc.Driver not found.
[ main] DbCommandExecutor ERROR Exiting with exit code 3
注意看錯誤信息有個-cp :/opt/cloudera/cm/schema/../lib/*，翻譯過來正好對應/opt/cloudera/cm/lib
所以可以這樣，cp /usr/share/java/mysql-connector-java.jar /opt/cloudera/cm/lib。把mysql jar包往/opt/cloudera/cm/lib下放一份，再執行一下：
[root@master /]# sudo /opt/cloudera/cm/schema/scm_prepare_database.sh mysql scm scm
Enter SCM password:
JAVA_HOME=/usr/java/jdk1.8.0_181-cloudera
Verifying that we can write to /etc/cloudera-scm-server
Creating SCM configuration file in /etc/cloudera-scm-server
Executing: /usr/java/jdk1.8.0_181-cloudera/bin/java -cp :/opt/cloudera/cm/schema/../lib/* com.cloudera.enterprise.dbutil.DbCommandExecutor /etc/cloudera-scm-server/db.properties com.cloudera.cmf.db.
Loading class `com.mysql.jdbc.Driver'. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver'. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.
[ main] DbCommandExecutor INFO Successfully connected to database.
All done, your SCM database is configured correctly!
總結：
個人覺得應該看啓動日誌-cp 後面的路徑 -cp後面的路徑是哪，就把msyql jar包往哪放一份就行。