Ubuntu 14.04 无法从代理接收检测信号

我正在尝试在Ubuntu 14.04上安装cloudera。 我在添加新群集节点时收到一条错误消息

Ensure that the host's hostname is configured properly.
Ensure that port 7182 is accessible on the Cloudera Manager Server (check firewall rules).
Ensure that ports 9000 and 9001 are not in use on the host being added.
Check agent logs in /var/log/cloudera-scm-agent/ on the host being added. (Some of the logs can be found in the installation details).
If Use TLS Encryption for Agents is enabled in Cloudera Manager (Administration -> Settings -> Security), ensure that /etc/cloudera-scm-agent/config.ini has use_tls=1 on the host being added. Restart the corresponding agent and click the Retry link here.

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请帮助安装NTP服务器。使用时间服务器详细信息配置/etc/ntp.conf。然后启动ntpd服务并将其添加到启动中

我已经安装并配置了，但问题没有解决。你启动了ntpd服务吗？我太担心这个问题了，你解决了吗？