Ambari host registration failed

[#1]

I had a similar issue and wanted to add my findings to hopefully help those in the future reading this note. I went through all the above checks with ports, firewalls, TPH, etc and the new host still failed to register. Finally during some checking, I noticed the /etc/hosts file had a different name than what was in DNS for this host IP(the server was built with a different host name, then renamed without changing /etc/hosts). Since DNS resolved to the correct IP all the port checking worked. However, I assume when the ambari-agent was started it read the hosts file so it knew itself as the hostname in the /etc/hosts file which was incorrect. After updating the /etc/hosts file and restarting the ambari-agent everything worked.

[#2]

To solve this issues you should be known these things first:-

• try to use the private SSH key in the ambari service host .
• copy the private key to the public key and use this copy key
• try to keep the private key file into the web UI

[#3]

So today I rebooted the machine and restarted Ambari-Agent and it was able to connect.. ince DNS resolved to the correct IP all the port checking worked. However, I assume when the ambari-agent

,

Since DNS resolved to the correct IP all the port checking worked. However, I assume when the ambari-agent was started it read the hosts file so it knew itself as the hostname

[#4]

I want to Ambari to build a platform for testing some functionalities on spark. I use Win 10+Hyper-V to create two VMs (mercury.gc and venus.gc) installed with CentOS 7. Ambari 2.2.2.0 is installed on one VM (mercury.gc) and try to use it to config these two VMs.

[#5]

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[#6]

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[#7]

Ambari agent could also fail due to a bug which requires:

force_https_protocol=PROTOCOL_TLSv1_2