用好几台机器尝试过，普通用户都在报错，sudo 也不行。一定要 root 用户直接操作才可以吗？
+======================================================================+
| Error: Unable to find a compatible version of Java on this host,|
| either because JAVA_HOME has not been set or because a |
| compatible version of Java is not installed. |
+----------------------------------------------------------------------+
| Please install either: |
| - a supported version of the Oracle JDK from the Oracle Java web |
| site: |
| > http://www.oracle.com/technetwork/java/javase/index.html < |
| OR |
| - a supported version of the OpenJDK from your OS vendor. Help for |
| some OSes are available at: |
| > http://openjdk.java.net/install/ < |
| |
| Cloudera Manager requires Oracle JDK or OpenJDK 1.8 or later. |
| NOTE: Cloudera Manager will find the Oracle JDK when starting, |
| regardless of whether you installed the JDK using a binary |
| installer or the RPM-based installer. |
+======================================================================+
error: %pre(cloudera-manager-server-6.2.0-968826.el7.x86_64) scriptlet failed, exit status 1
Error in PREIN scriptlet in rpm package cloudera-manager-server-6.2.0-968826.el7.x86_64
验证中 : cloudera-manager-agent-6.2.0-968826.e 1/3
验证中 : cloudera-manager-daemons-6.2.0-968826 2/3
验证中 : cloudera-manager-server-6.2.0-968826. 3/3
已安装:
cloudera-manager-agent.x86_64 0:6.2.0-968826.el7
失败:
cloudera-manager-daemons.x86_64 0:6.2.0-968826.el7
cloudera-manager-server.x86_64 0:6.2.0-968826.el7
只要是 sudo，就会报这个错，如果 su - root 后，就可以成功。
新手上路有点懵，一般情况下 root 用户都不大用的啊。