Confirm Host step failing in ubuntu

[#1]

Hey,

I am working with the ambari 2.7.0.0 and I have followed all the steps but at the step where we need to register hosts is getting failed. I am registering hosts with the ssh key and the step is installing the ambari-agent but failing at the time of registering the host with the server. Please can anyone help me.Here is the log of the ambari server.

[#2]

@Ayushj250 

Please check the following:

1. What is the ambari server host name used by the agents ?   

# grep 'hostname' /etc/ambari-agent/conf/ambari-agent.ini

Ideally you should see the FQDN of ambari-server host listed in the hostname section of the ambari-agent.ini file.

>>> Above need to be checked carefully because in your attached screenshot we see partial output sayig :

NetUtil.py:61 - Connecting to https://ip...... 

.

NOTICE it shows that your ambari-server FQDN is something like  "ip-" ....

.

But from the screenshot looks like your ambari server FQDN may be "ayush-ambari-server.com"

So please check if all your cluster nodes are able to resolve each other using their FQDN (Fully Qualified Hostname)  or not?

Hence please check the following from every cluster node:

1. If each host has correct FQDN?

# hostname -f

# python -c "import socket; print('FQDN = ' + socket.getfqdn()); print('Hostname = ' + socket.gethostname()); print('IPAddress = ' + socket.gethostbyname(socket.getfqdn()))"

2. If every host can connect to ambari-server using ambari servers  FQDN on ambari ports like:

# nc -v ayush-ambari-server.com  8440
# nc -v ayush-ambari-server.com  8441