1、Exhausted available authentication methods
ubuntu未激活root用户，或者激活root用户后未允许可远程登录root 用户
参考stackoverflow:Cloudera Manager Failed to authenticate : Exhausted available authentication methods
Let's consolidate everything in one post:
Default, Root user is locked in ubuntu/Linux.To unlock, first need to reset password. It asks for Password twice.
$ sudo passwd root
Enter UNIX password:
Retype UNIX password:
Unlock root user
$ sudo passwd -u root
Open /etc/ssh/sshd_config in an editor:
sudo nano /etc/ssh/sshd_config
In the file now look for PermitRootLogin without-password and replace it with this
PermitRootLogin yes
Restart SSH service
sudo service ssh restart
测试能否远程登录root用户及解决方案：
Exhausted available authentication methods
相关链接：ubuntu首次给root用户设置密码
关于Ubuntu拒绝root用户ssh远程登录
2、安装失败。 无法接收 Agent 发出的检测信号
/var/log/cloudera-scm-agent/ 中的错误日志如下：
[22/Apr/2018 22:23:00 +0000] 17968 MainThread agent ERROR Failed to connect to previous supervisor.
Traceback (most recent call last):
File "/usr/lib/cmf/agent/build/env/lib/python2.7/site-packages/cmf-5.14.2-py2.7.egg/cmf/agent.py", line 2136, in find_or_start_supervisor
self.configure_supervisor_clients()
File "/usr/lib/cmf/agent/build/env/lib/python2.7/site-packages/cmf-5.14.2-py2.7.egg/cmf/agent.py", line 2317, in configure_supervisor_clients
supervisor_options.realize(args=["-c", os.path.join(self.supervisor_dir, "supervisord.conf")])
File "/usr/lib/cmf/agent/build/env/lib/python2.7/site-packages/supervisor-3.0-py2.7.egg/supervisor/options.py", line 1599, in realize
Options.realize(self, *arg, **kw)
File "/usr/lib/cmf/agent/build/env/lib/python2.7/site-packages/supervisor-3.0-py2.7.egg/supervisor/options.py", line 333, in realize
self.process_config()
File "/usr/lib/cmf/agent/build/env/lib/python2.7/site-packages/supervisor-3.0-py2.7.egg/supervisor/options.py", line 341, in process_config
self.process_config_file(do_usage)
File "/usr/lib/cmf/agent/build/env/lib/python2.7/site-packages/supervisor-3.0-py2.7.egg/supervisor/options.py", line 376, in process_config_file
self.usage(str(msg))
File "/usr/lib/cmf/agent/build/env/lib/python2.7/site-packages/supervisor-3.0-py2.7.egg/supervisor/options.py", line 164, in usage
self.exit(2)
SystemExit: 2
可能原因：
Ensure that the host's hostname is configured properly.
/etc/hosts下的ip配置必须采用FQDN
如果是centOS系统，查看 /etc/hosts 和 /etc/sysconfig/network 下的配置是否一致
如果是ubuntu系统，查看 /etc/hosts 和 /etc/hostname 下的配置是否一致
修改hostname后，重新修改root用户的免密码登录自身ssh localhost（需要？如果需要cdh还要知道登录root用户的密码干嘛？）
cdh大概是因为在操作中使用ssh登录root用户时查找当前主机的主机名，发现它是lizhifeng-Lenovo-g400，
登录后的roo用户模式为root@lizhifeng-Lenovo-g400，与以下设定的主机名称相悖。
为什么要求FQDN?因为FQDN就是把主机名配到域名中，作为域名的一部分。这样就不会出现主机名配置不正确的问题
解决办法：linux设置FQDN
Installation failed. Failed to receive heartbeat from agent
CDH5.3.6离线安装手册
3、在安装过程中，一直停在activating状态
log日志如下：
Monitor-HostMonitor throttling_logger ERROR Failed to collect NTP metrics
Traceback (most recent call last):
安装cdh前先安装ntp
OSError: [Errno 2] No such file or directory
[23/Apr/2018 19:26:25 +0000] 2373 Monitor-HostMonitor throttling_logger ERROR Timed out waiting for worker process collecting filesystem usage to complete. This may occur if the host has an NFS or other remote filesystem that is not responding to requests in a timely fashion. Current nodev filesystems: /run,/dev/shm,/run/lock,/sys/fs/cgroup,/run/user/108,/run/user/0,/run/user/1000,/run/cloudera-scm-agent/process
[23/Apr/2018 19:28:55 +0000] 2373 MainThread agent INFO Stopping agent...
[23/Apr/2018 20:43:37 +0000] 5921 Thread-13 https ERROR Failed to retrieve/stroe URL: http://master.cdh.com:7180/cmf/parcel/download/CDH-5.14.2-1.cdh5.14.2.p0.3-xenial.parcel.torrent -> /opt/cloudera/parcel-cache/CDH-5.14.2-1.cdh5.14.2.p0.3-xenial.parcel.torrent
