安装CDH6.2.1，在使用systemctl start cloudera-scm-server启动，status查看时，启动失败。
查看/var/log/cloudera-scm-server 下没有日志
再查看服务相关的日志： journalctl -xe
报错为:
May 31 11:12:37 hadoop102 cm-server[4564]: | site: | May 31 11:12:37 hadoop102 cm-server[4564]: | > http://www.oracle.com/technetwork/java/javase/index.html < | May 31 11:12:37 hadoop102 cm-server[4564]: | OR | May 31 11:12:37 hadoop102 cm-server[4564]: | - a supported version of the OpenJDK from your OS vendor. Help for | May 31 11:12:37 hadoop102 cm-server[4564]: | some OSes are available at: | May 31 11:12:37 hadoop102 cm-server[4564]: | > http://openjdk.java.net/install/ < | May 31 11:12:37 hadoop102 cm-server[4564]: | | May 31 11:12:37 hadoop102 cm-server[4564]: | Cloudera Manager requires Oracle JDK or OpenJDK 1.8 or later. | May 31 11:12:37 hadoop102 cm-server[4564]: | NOTE: Cloudera Manager will find the Oracle JDK when starting, | May 31 11:12:37 hadoop102 cm-server[4564]: | regardless of whether you installed the JDK using a binary | May 31 11:12:37 hadoop102 cm-server[4564]: | installer or the RPM-based installer. | May 31 11:12:37 hadoop102 cm-server[4564]: +======================================================================+ May 31 11:12:37 hadoop102 systemd[1]: cloudera-scm-server.service: main process exited, code=exited, status=1/FAILURE May 31 11:12:37 hadoop102 systemd[1]: Unit cloudera-scm-server.service entered failed state. May 31 11:12:37 hadoop102 systemd[1]: cloudera-scm-server.service failed. May 31 11:12:37 hadoop102 systemd[1]: cloudera-scm-server.service holdoff time over, scheduling restart. May 31 11:12:37 hadoop102 systemd[1]: Stopped Cloudera CM Server Service. -- Subject: Unit cloudera-scm-server.service has finished shutting down -- Defined-By: systemd -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- -- Unit cloudera-scm-server.service has finished shutting down. May 31 11:12:37 hadoop102 systemd[1]: start request repeated too quickly for cloudera-scm-server.service May 31 11:12:37 hadoop102 systemd[1]: Failed to start Cloudera CM Server Service. -- Subject: Unit cloudera-scm-server.service has failed -- Defined-By: systemd -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- -- Unit cloudera-scm-server.service has failed. -- -- The result is failed. May 31 11:12:37 hadoop102 systemd[1]: Unit cloudera-scm-server.service entered failed state. May 31 11:12:37 hadoop102 systemd[1]: cloudera-scm-server.service failed. May 31 11:12:51 hadoop102 polkitd[752]: Registered Authentication Agent for unix-process:4602:1046407 (system bus name :1.92 [/usr/bin/pkttyagent --not May 31 11:12:51 hadoop102 polkitd[752]: Unregistered Authentication Agent for unix-process:4602:1046407 (system bus name :1.92, object path /org/freede
是因为jdk的版本不对，要下载cdh6.2.1自带的oracle-j2sdk1.8-1.8.0+update181-1.x86_64.rpm包。