执行后数据库中的scm库没有任何表和数据
刚开始报这个错误，心想增加scm的对hadoop01.xx.com访问即可
重新执行：
/opt/cloudera/cm/schema/scm_prepare_database.sh -hhadoop01 --scm-host hadoop01 mysql scm scm 123456
执行之后没有报任务错误，但是数据库中scm没有初始化一个表，全是空的。
心里很纳闷，脚本的语法没写错，如果是数据库连不上那应该报错啊，但是没有，于是还是去检查了一遍，使用mysql -root -p123456可以进入mysql数据库，于是排除了数据库连接的问题，那是什么原因？版本5.6去官网查询了也是支持的，而且5.6.46是我去mysql官网下载的5.6版本里面最稳定的，结论排除此原因。
心里一直琢磨到底是什么原因导致，执行没报异常，但是数据库里没数据。从我的经验出发遇到这类问题，于是就去翻官网文档，不得不说cloudea文档写得很非常棒
https://docs.cloudera.com/documentation/enterprise/6/6.3/topics/prepare_cm_database.html
此参数配置和官网说得一样，检查确认没问题
此时有点郁闷，都没问题到底是什么原因？？
心中还是只有一个念头，就是错误日志信息太少，我想打印些日志信息也参数配置。于是想到自己的linux系统是CenOS7的。有系统日志命令，于是打印查看
journalctl -xe
[root@hadoop01 ~]# journalctl -xe Oct 28 09:19:23 hadoop01 avahi-daemon[11856]: Withdrawing address record for 192.168.122.1 on virbr0. Oct 28 09:19:23 hadoop01 avahi-daemon[11856]: Withdrawing workstation service for virbr0. Oct 28 09:19:23 hadoop01 avahi-daemon[11856]: Withdrawing address record for fe80::44a6:91bd:cc0a:c335 on ens192. Oct 28 09:19:23 hadoop01 avahi-daemon[11856]: Withdrawing address record for fe80::3c7e:ac7c:5452:edc6 on ens192. Oct 28 09:19:23 hadoop01 avahi-daemon[11856]: Host name conflict, retrying with hadoop01-8040 Oct 28 09:19:23 hadoop01 avahi-daemon[11856]: Registering new address record for 192.168.122.1 on virbr0.IPv4. Oct 28 09:19:23 hadoop01 avahi-daemon[11856]: Registering new address record for fe80::44a6:91bd:cc0a:c335 on ens192.*. Oct 28 09:19:23 hadoop01 avahi-daemon[11856]: Registering new address record for fe80::3c7e:ac7c:5452:edc6 on ens192.*. Oct 28 09:19:23 hadoop01 avahi-daemon[11856]: Registering new address record for fe80::cc18:552d:c34f:830b on ens192.*. Oct 28 09:19:23 hadoop01 avahi-daemon[11856]: Registering new address record for 192.168.12.101 on ens192.IPv4. Oct 28 09:19:23 hadoop01 avahi-daemon[11856]: Registering HINFO record with values 'X86_64'/'LINUX'. Oct 28 09:19:43 hadoop01 avahi-daemon[11856]: Withdrawing address record for 192.168.122.1 on virbr0. Oct 28 09:19:43 hadoop01 avahi-daemon[11856]: Withdrawing address record for fe80::44a6:91bd:cc0a:c335 on ens192. Oct 28 09:19:43 hadoop01 avahi-daemon[11856]: Withdrawing address record for fe80::3c7e:ac7c:5452:edc6 on ens192. Oct 28 09:19:43 hadoop01 avahi-daemon[11856]: Registering new address record for 192.168.122.1 on virbr0.IPv4. Oct 28 09:19:43 hadoop01 avahi-daemon[11856]: Registering new address record for fe80::44a6:91bd:cc0a:c335 on ens192.*. Oct 28 09:19:43 hadoop01 avahi-daemon[11856]: Registering new address record for fe80::cc18:552d:c34f:830b on ens192.*. Oct 28 09:19:43 hadoop01 avahi-daemon[11856]: Server startup complete. Host name is hadoop01-8040.local. Local service cookie is 1979383840 Oct 28 09:19:43 hadoop01 avahi-daemon[11856]: Withdrawing address record for fe80::cc18:552d:c34f:830b on ens192. Oct 28 09:19:43 hadoop01 avahi-daemon[11856]: Withdrawing address record for 192.168.12.101 on ens192. Oct 28 09:19:43 hadoop01 avahi-daemon[11856]: Withdrawing workstation service for ens192. Oct 28 09:19:43 hadoop01 avahi-daemon[11856]: Withdrawing workstation service for lo. Oct 28 09:19:43 hadoop01 avahi-daemon[11856]: Withdrawing workstation service for virbr0-nic. Oct 28 09:19:43 hadoop01 avahi-daemon[11856]: Withdrawing address record for 192.168.122.1 on virbr0. Oct 28 09:19:43 hadoop01 avahi-daemon[11856]: Withdrawing workstation service for virbr0. Oct 28 09:19:43 hadoop01 avahi-daemon[11856]: Withdrawing address record for fe80::44a6:91bd:cc0a:c335 on ens192. Oct 28 09:19:43 hadoop01 avahi-daemon[11856]: Host name conflict, retrying with hadoop01-8041 Oct 28 09:19:43 hadoop01 avahi-daemon[11856]: Registering new address record for 192.168.122.1 on virbr0.IPv4. Oct 28 09:19:43 hadoop01 avahi-daemon[11856]: Registering new address record for fe80::44a6:91bd:cc0a:c335 on ens192.*. Oct 28 09:19:43 hadoop01 avahi-daemon[11856]: Registering new address record for fe80::3c7e:ac7c:5452:edc6 on ens192.*. Oct 28 09:19:43 hadoop01 avahi-daemon[11856]: Registering new address record for fe80::cc18:552d:c34f:830b on ens192.*. Oct 28 09:19:43 hadoop01 avahi-daemon[11856]: Registering new address record for 192.168.12.101 on ens192.IPv4. Oct 28 09:19:43 hadoop01 avahi-daemon[11856]: Registering HINFO record with values 'X86_64'/'LINUX'. Oct 28 09:20:01 hadoop01 systemd[1]: Started Session 482 of user root. -- Subject: Unit session-482.scope has finished start-up -- Defined-By: systemd -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- -- Unit session-482.scope has finished starting up. -- -- The start-up result is done. Oct 28 09:20:01 hadoop01 CROND[56675]: (root) CMD (/usr/lib64/sa/sa1 1 1) Oct 28 09:20:16 hadoop01 CommAmqpListene[56536]: [CCafException] AmqpComm@[56536]: CommAmqpListener: [CCafException] AmqpCommon::validateSt lines 987-1029/1029 (END)突然很高兴，因为这里说得很清楚，
Host name conflict, retrying with hadoop01-8040
主机名冲突，我配置的是主机名初始化的，于是先改成ip测试下，
同时把这个问题抛给运维人员（此运维人员没有open的思想，问他了也不说：但是我执行了history去查看历史的命令他没有用过，那我估计他虚拟化主机的时候，虚拟机ip的配置及映射有问题）
果然执行之后数据库里面的scm库有数据了，此时笑了出来，妈蛋原来是主机环境问题。
于是回过来把环境都检查确认了一遍
等运维把主机名冲突的事情解决了，我重新执行了带主机名的脚本，这下正常了
