问题描述：在华为云上安装CDH6.2，中途安装失败
华为云端口控制很细，分内外网，需要把各机器间的端口完全放开，然后：
1、对应节点上停止服务
systemctl stop cloudera-scm-server systemctl stop cloudera-scm-agent
1、删除Agent节点上的cm_guid
rm -f /var/lib/cloudera-scm-agent/cm_guid
2、drop scm库
drop database scm;
3、删除Agent节点上的 namenode 和 datanode 节点信息
rm -rf /opt/dfs/nn/* rm -rf /opt/dfs/dn/*
4、在主节点上重新初始化CM数据库
/opt/cloudera/cm/schema/scm_prepare_database.sh mysql scm scm scm
5、对应节点启动服务，并查看运行状态
systemctl start cloudera-scm-server systemctl start cloudera-scm-agent systemctl status cloudera-scm-server systemctl status cloudera-scm-agent
6、监控运行日志，重新安装集群
tail -f /var/log/cloudera-scm-server/cloudera-scm-server.log tail -f /var/log/cloudera-scm-agent/cloudera-scm-agent.log
