blocks|key|1026398|text|设置带有amabari的集群需要执行以下步骤：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1026399|设置无密码SSH|ordered-list-item|1026400|让安巴里利用这个|1026401|您看到的症状出现在第2部分中，但从注释来看，问题的根本原因实际上在第1部分。|1026402|好消息是，当问题不是hadoop特定的问题时，您将看到通常会有更多的人遇到这些问题，并发布解决方案。|1026403|我不确定这在您的情况下是否有帮助(因为您正在以根用户身份进行操作)，但是快速搜索未能添加主机导致了这个问题，它基本上表明了相关ssh文件可能存在一个正确的问题。|offset|length|1026404|只是想一想:如果您的问题是无法将主机添加到已知的主机文件中，那么也许可以手动添加它。|1026405|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/34928228/failed-to-add-the-host-to-the-list-of-known-hosts-how-to-debug^0|0|0|0|0|0|1D|4|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Z|8|@]|9|@]|A|$]]|$1|E|3|F|5|D|7|10|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|11|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|12|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|13|8|@]|9|@$M|14|N|15|1|16]]|A|$]]|$1|O|3|P|5|6|7|17|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]]]

The following steps are required for setting up a cluster with amabari:

<ol>
<li>Setting up passwordless SSH</li>
<li>Letting ambari make use of this</li>
</ol>

The symptoms you see occur in part 2, but judging from the comment the root cause of the problem is actually in part 1.

The good news is that when problems are not hadoop specific, you will see that typically more people will run into them, and post solutions. 

I am not sure whether this helps in your case (as you are doing things as root), but a quick search for failing to add the host led me to <a href="https://stackoverflow.com/questions/34928228/failed-to-add-the-host-to-the-list-of-known-hosts-how-to-debug">this question</a>, which basically indicated that there may be a right issue on the relevant ssh file.

Just thinking out of the box: if your problem is that the host cannot be added to the known hosts file, perhaps you can add it manually somehow.

blocks|key|1026474|text|最佳实践是在集群中的所有主机上使用手动安装ambari代理。使用此方法添加主机避免了复制SSH密钥的需要。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1026475|假设您使用的是Ubuntu：|1026476|在集群中的每个主机上安装Ambari代理：apt-get+install+ambari-agent|ordered-list-item|style|CODE|1026477|通过编辑ambari-agent.ini文件配置Ambari，如以下示例所示：vi+/etc/ambari-agent/conf/ambari-agent.ini|1026478|安巴里代理公司：|1026479|[server]
hostname=<your.ambari.server.hostname>
url_port=8440
secured_url_port=8441|code-block|syntax|javascript|1026480|在集群中的每个主机上启动代理：ambari-agent+start|1026481|代理在开始时向服务器注册。|1026482|如果由于某种原因手动安巴里代理注册不是一个选项，并且必须使用SSH，则可以通过执行以下命令添加远程主机的密钥指纹：|1026483|ssh-keyscan+-H+shubham-R528-R728+>>+~/.ssh/known_hosts|1026484|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.hortonworks.com/HDPDocuments/Ambari-2.5.1.0/bk_ambari-administration/content/install_the_ambari_agents_manually.html^0|H|C|0|0|0|L|S|0|13|16|0|0|0|F|I|0|0|0|0^^$0|@$1|2|3|4|5|6|7|19|8|@]|9|@$A|1A|B|1B|1|1C]]|C|$]]|$1|D|3|E|5|6|7|1D|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|1E|8|@$A|1F|B|1G|I|J]]|9|@]|C|$]]|$1|K|3|L|5|H|7|1H|8|@$A|1I|B|1J|I|J]]|9|@]|C|$]]|$1|M|3|N|5|6|7|1K|8|@]|9|@]|C|$]]|$1|O|3|P|5|Q|7|1L|8|@]|9|@]|C|$R|S]]|$1|T|3|U|5|H|7|1M|8|@$A|1N|B|1O|I|J]]|9|@]|C|$]]|$1|V|3|W|5|H|7|1P|8|@]|9|@]|C|$]]|$1|X|3|Y|5|6|7|1Q|8|@]|9|@]|C|$]]|$1|Z|3|10|5|Q|7|1R|8|@]|9|@]|C|$R|S]]|$1|11|3|-4|5|6|7|1S|8|@]|9|@]|C|$]]]|12|$13|$5|14|15|16|C|$17|18]]]]

The best practice is to <a href="https://docs.hortonworks.com/HDPDocuments/Ambari-2.5.1.0/bk_ambari-administration/content/install_the_ambari_agents_manually.html" rel="nofollow noreferrer">install ambari-agent manually</a> on all hosts in the cluster. Adding hosts using this method avoids the need to copy around SSH keys.

Assuming you are using Ubuntu:

<ol>
<li>Install the Ambari Agent on every host in your cluster: <code>apt-get install ambari-agent</code></li>
<li>Configure the Ambari Agent by editing the ambari-agent.ini file as shown in the following example: <code>vi /etc/ambari-agent/conf/ambari-agent.ini</code></li>
</ol>

ambari-agent.ini:

<pre><code>[server]
hostname=&lt;your.ambari.server.hostname&gt;
url_port=8440
secured_url_port=8441
</code></pre>

<ol start="3">
<li>Start the agent on every host in your cluster: <code>ambari-agent start</code></li>
<li>The agent registers with the Server on start.</li>
</ol>

<hr>

If manual ambari-agent registration is not an option for some reason, and you must use SSH, then you can add the key fingerprint of the remote host by executing the following command:

<pre><code>ssh-keyscan -H shubham-R528-R728 &gt;&gt; ~/.ssh/known_hosts
</code></pre>

I am using single machine to set up Ambari server, so that I can install Hadoop. A lot of sites were referred to. The error I am getting while registering node is:

<pre><code>Creating target directory...
==========================

Command start time 2017-07-26 14:50:10

Permission denied (publickey).
SSH command execution finished
host=shubham-r528-r728, exitcode=255
Command end time 2017-07-26 14:50:11

ERROR: Bootstrap of host shubham-r528-r728 fails because previous action finished with non-zero exit code (255)
ERROR MESSAGE: Permission denied (publickey).

STDOUT: 
Permission denied (publickey).
</code></pre>

<a href="https://i.stack.imgur.com/3lGA5.png" rel="nofollow noreferrer">enter image description here</a>

I have 

<pre><code>shubham@shubham-R528-R728:~$ hostname -f
shubham-R528-R728
shubham@shubham-R528-R728:~$ 
</code></pre>

I follow <a href="http://linux-sys-adm.com/how-to-install-and-configure-ssh-on-ubuntu-server-14.04-lts-step-by-step/" rel="nofollow noreferrer">http://linux-sys-adm.com/how-to-install-and-configure-ssh-on-ubuntu-server-14.04-lts-step-by-step/</a> on my root account to set up ssh key.

Failing to add host in Ambari server

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我使用单机来设置Ambari服务器，以便安装Hadoop。很多网站都被提到了。注册节点时遇到的错误是：Creating target directory...==========================Command start time 2017-07-26 14:50:10Permission denied...

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