Ambari host registration failed

[#1]

I am trying to add a new host to my existing cluster. Below is what I have done so far:

a.) I installed Ambari-Agent on the new hosts and modified the INI file to point to the ambari-server hosts

b.) Verified that new host is able to ping ambari-server and vice versa.

c.) Verified that the Ambari-Server port is open from the new hosts

What else Ambari-Server looks for ? If it can ping the new host and new host can ping and the ambari-server is reachable why it can't register. What's the missing part ?

Thanks

Prakash

[#2]

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.

[#3]

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

[#4]

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

[#5]

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[#6]

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[#7]

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[#8]

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

force_https_protocol=PROTOCOL_TLSv1_2